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Single Wall Carbon Nanotubes (SWCNTs) as (i) Type in the Photovoltaic Cell of Nano-Dimensions
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作者 Maen Ishtaiwi Muna Hajjyahya +1 位作者 Khalid Abd-Haqq Mohammed Bashar 《Journal of Applied Mathematics and Physics》 2022年第5期1694-1701,共8页
In this paper, a new modified approach to design the photovoltaic cell has been presented by adding Single Wall Carbon Nanotubes (SWCNTs) as type (i). The main issue is to increase the efficiency of the photovoltaic c... In this paper, a new modified approach to design the photovoltaic cell has been presented by adding Single Wall Carbon Nanotubes (SWCNTs) as type (i). The main issue is to increase the efficiency of the photovoltaic cell, on the other hand, to exploit a larger range of electromagnetic wave frequencies, specifically a range within terahertz (THz) frequency domain, using 3D EM computer simulation technology (CST). It is clear in the normal PV cell start working at frequency of 500 THz, while the frequency at which the PV cell with SWCNTs operates is much less and it is close to zero, on the other hand, the PV cell with SWCNTs needs a larger cross-section area of 2800 nm2 to operate at frequency of 500 THz. This cell can be easily produced industrially, which means increases the efficiency of solar cell. 展开更多
关键词 single wall carbon nanotubes (SWCNTs) Photovoltaic Cell (PV) CST Simulation
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Midinfrared optical frequency comb based on difference frequency generation using high repetition rate Er-doped fiber laser with single wall carbon nanotube film 被引量:3
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作者 M.Tsuzuki L.Jin +9 位作者 M.Yamanaka V.Sonnenchein H.Tomita A.Sato T.Ohara Y.Sakakibara E.Omoda H.Kataura T.Iguchi N.Nishizawa 《Photonics Research》 SCIE EI 2016年第6期313-317,共5页
We demonstrated stable midinfrared(MIR) optical frequency comb at the 3.0 μm region with difference frequency generation pumped by a high power, Er-doped, ultrashort pulse fiber laser system. A soliton mode-locked161... We demonstrated stable midinfrared(MIR) optical frequency comb at the 3.0 μm region with difference frequency generation pumped by a high power, Er-doped, ultrashort pulse fiber laser system. A soliton mode-locked161 MHz high repetition rate fiber laser using a single wall carbon nanotube was fabricated. The output pulse was amplified in an Er-doped single mode fiber amplifier, and a 1.1–2.2 μm wideband supercontinuum(SC) with an average power of 205 m W was generated in highly nonlinear fiber. The spectrogram of the generated SC was examined both experimentally and numerically. The generated SC was focused into a nonlinear crystal, and stable generation of MIR comb around the 3 μm wavelength region was realized. 展开更多
关键词 high Midinfrared optical frequency comb based on difference frequency generation using high repetition rate Er-doped fiber laser with single wall carbon nanotube film MIR SWNT PCF rate mode DSF EDF length SC DFG
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Demonstration of Covalent Sidewall Functionalization of Single Wall Carbon Nanotubes by NMR Spectroscopy:Side Chain Length Dependence on the Observation of the Sidewall sp^(3)Carbons 被引量:1
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作者 Liling Zeng Lawrence B.Alemany +1 位作者 Christopher L.Edwards Andrew R.Barron 《Nano Research》 SCIE EI CSCD 2008年第1期72-88,共17页
Carboxylic acid-functionalized single walled carbon nanotubes(SWNTs)prepared via the reaction of an amino acid,NH2(CH2)nCO2H where n=1(glycine,GLY),5(6-aminohexanoic acid,AHA),10(11-aminoundecanoic acid,AUDA),with fl ... Carboxylic acid-functionalized single walled carbon nanotubes(SWNTs)prepared via the reaction of an amino acid,NH2(CH2)nCO2H where n=1(glycine,GLY),5(6-aminohexanoic acid,AHA),10(11-aminoundecanoic acid,AUDA),with fl uorinated single walled carbon nanotubes(F-SWNTs)have been characterized by MAS 13C NMR spectroscopy.The ease of observing the aliphatic CH2 groups and the resolution of the signal are dependent on the length of the amino acid’s aliphatic chain.We have proposed that where substituent chains are short(making NMR data collection difficult)chemical modification to extend the chain length should alleviate analysis problems.In this regard,we have investigated the esterifi cation of the carboxylic acid termini.The amino acid-functionalized SWNTs were esterified with an appropriate alcohol to ensure parity of the overall substituent length,i.e.,GLY-SWNT(C1)+1-dodecanol(C_(12))=DOD-GLY-SWNT(1),AHA-SWNT(C_(5))+1-octanol(C_(8))=OCT-AHA-SWNT(2),and AUDA-SWNT(C_(10))+1-propanol(C_(3))=PRO-AUDA-SWNT(3).The 13C NMR shift for the sp3 nitrogen-substituted carbon atoms of the SWNT sidewall is observed atδ≈75 ppm.Increasing the length of SWNT sidewall functional groups enhances the ability to observe the sidewall sp^(3)carbon.The methylene carbon signal intensity is less attenuated in the dipolar dephasing spectrum of the ester-functionalized SWNTs than their associated amino acid derivatives,suggesting more motional freedom of the side chain in the solid state.The confi rmation of the dipolar dephasing spectral effects was assisted by the characterization of the ester of AUDA-SWNT with 1,3-propanediol:PPD-AUDA-SWNT(4). 展开更多
关键词 single walled carbon nanotube(SWNT) nuclear magnetic resonance(NMR) ESTERIFICATION amino acid FUNCTIONALIZATION
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Purification of Single-walled Carbon Nanotubes Grown by a Chemical Vapour Deposition(CVD) Method 被引量:1
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作者 Cigang Xu Emmanuel Flahaut +5 位作者 Sam R.Bailey Gareth Brown Jeremy Sloan Karl S.Coleman VClifford Williams Malcolm L.H.Green 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2002年第2期130-132,共3页
A procedure for purification of single walled carbon nanotubes(SWNTs) grown by the chemical vapour deposition(CVD) of carbon monooxide has been developed. Based on the result from TGA/DTA of as prepared sample, the ... A procedure for purification of single walled carbon nanotubes(SWNTs) grown by the chemical vapour deposition(CVD) of carbon monooxide has been developed. Based on the result from TGA/DTA of as prepared sample, the oxidation temperature was determined. The process included sonication, oxidation and acid washing steps. The purity and yield after purification were determined and estimated by TEM. Moreover, for the first time, a loop structure for CVD SWNTs has been observed. 展开更多
关键词 single walled carbon nanotubes(SWNTs) PURIFICATION Chemical vapour deposition(CVD)
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Ethane Adsorption in Single Walled Carbon Nanotube by Density Functional Theory
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作者 张现仁 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第6期644-649,共6页
Density functional theory (DFT) is used to calculate adsorption of ethane molecules in single walled carbon nanotubes. A compari-son of DFT calculations and grand canonical ensemble Monte Carlo (GCMC) simulations is m... Density functional theory (DFT) is used to calculate adsorption of ethane molecules in single walled carbon nanotubes. A compari-son of DFT calculations and grand canonical ensemble Monte Carlo (GCMC) simulations is made first and the two methods are in good agree-ment. Adsorption isotherms and structures of ethane molecules inside the tubes have been studied by DFT for the nanotubes of diameters 0.954, 2.719 and 4.077 nm at 157 K and ambient temperature, 300 K. By using the grand potential, the positions of phase transitions are exactly lo-cated, and the effect of temperature and tube diameter on phase transitions and adsorption is discussed. We found that lowering temperature and increasing the pore size of several nanometer is preferable for the ethane adsorption when temperature is in the range of 157 K—300 K and op-erating pressure reaches several MPa. Layering transitions and capillary condensations are observed at 157 K in two larger pore diameters, while these phase transitions disappear or the hysteres is loops become very narrow at 300 K. 展开更多
关键词 density functional theory ADSORPTION ETHANE single walled carbon nanotube
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Plasmon-enhanced ultra-high photoresponse of single-wall carbon nanotube/copper/silicon near-infrared photodetectors
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作者 Yi-Ming Zhao Xian-Gang Hu +6 位作者 Chao Chen Zuo-Hua Wang An-Ping Wu Hong-Wang Zhang Peng-Xiang Hou Chang Liu Hui-Ming Cheng 《Nano Research》 SCIE EI CSCD 2024年第7期5930-5936,共7页
Single wall carbon nanotube(SWCNT)/Si heterojunction photodetectors have the advantages of high photoresponse ability and simple structure,however,their detection wavelength range are usually lower than 1100 nm,which ... Single wall carbon nanotube(SWCNT)/Si heterojunction photodetectors have the advantages of high photoresponse ability and simple structure,however,their detection wavelength range are usually lower than 1100 nm,which limits their application in the infrared band.We report a SWCNT/Cu/Si photodetector with both a high photoresponse and a detection range up to the infrared band by depositing a Cu nanoparticles(NPs)layer between a SWCNT film and a n-Si substrate.It was found that the Cu NPs produce strong surface plasmon resonance(SPR)under laser irradiation,which breaks through the limitation of Si band gap and greatly improves the photoresponse of the SWCNT/Cu/Si photodetector in the near infrared band.The responsivity(R)of the photodetector in the wavelength range of 1850–1200 nm reached 2.2–14.15 mA/W,which is the highest value in the reported plasmon enhanced n-Si based photodetectors,and about 20,000 times higher than that of a SWCNT/Si photodetector.Its R value for 1550 nm wavelength used in optical communications reached~8.2 mA/W,which is 64%higher than the previously reported values of commonly used photodetectors.We attribute the significant increase to the strong SPR and low Schottky barrier of Cu with n-Si,which facilitates the generation and transfer of the carriers. 展开更多
关键词 single wall carbon nanotube PHOTODETECTOR silicon surface plasmon resonance copper
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Carbon nanotube-based nanoelectromechanical resonatoras mass biosensor 被引量:1
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作者 Ahmed MElseddawy Adel HPhillips Ahmed S Bayoumi 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第7期583-587,共5页
The use of single walled carbon nanotube-based nanoelectromechanical system(NEMS)resonator to sense the biomolecules'mass is investigated under the influence of an external ac-field.A single walled carbon nanotube... The use of single walled carbon nanotube-based nanoelectromechanical system(NEMS)resonator to sense the biomolecules'mass is investigated under the influence of an external ac-field.A single walled carbon nanotube(SWCNT)cantilever has been proposed and studied if the mass is attached at the tip or various intermediate positions.The shift of the resonant frequency and the quality factor have been investigated and show high sensitivity to the attached mass of biomolecule and its position.The proposed SWCNT-based NEMS resonator is a good candidate for sensing and tracing biomolecules'mass as concentration of acetone in human exhale,resulting in a painless,correct,and simple diabetics'diagnosis. 展开更多
关键词 single walled carbon nanotube nanoelectromechanical system resonator ac-field BIOMOLECULE
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Nonlinear vibration analysis of an embedded branched nanofluid-conveying carbon nanotube:Influence of downstream angle,temperature change and two dimensional external magnetic field
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作者 A.A.Yinusa M.G.Sobamowo A.O.Adelaja 《Nano Materials Science》 CAS 2020年第4期323-332,共10页
In this study,non-linear thermal-mechanical stability and vibration analyses of different end-shaped single-walled carbon nanotube conveying viscous nano-magnetic fluid embedded in non-linear visco-elastic foundation ... In this study,non-linear thermal-mechanical stability and vibration analyses of different end-shaped single-walled carbon nanotube conveying viscous nano-magnetic fluid embedded in non-linear visco-elastic foundation under the influence of magnetic fields are presented.The development of the equation of motion was based on Euler-Bernoulli theory,Hamilton principle and nonlocal elasticity theory.The results of the analytical solutions using Galerkin decomposition differential transform method(GDDTM)were validated with existing experimental results.From the parametric studies,it was shown that decreasing the temperature difference as well as increasing the downstream angle decreased the system's stability for pre-bifurcation analysis but increased stability of the system for post bifurcation analysis.Also,the results obtained from the dynamic behaviour of the system indicated that the magnetic effect had an attenuating impact of about 45%on the system's response at any mode and for any boundary condition considered.It is hoped that this work will enhance the design and optimization of nano-devices with I,V,Y,L,K and T-shaped junctions under the influence of thermal-magneto-mechanical flow induced vibration. 展开更多
关键词 Thermal-mechanical vibration Branched single walled carbon nanotube Magnetic field Galerkin and differential transformation method Dynamic and stability analysis
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Single-wall carbon nanotube-containing cathode interfacial materials for high performance organic solar cells 被引量:2
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作者 Fei Pan Song Bai +5 位作者 Tianhao Liu Dianyong Tang Xian Wei Xiwen Chen Menglan Lv Yongfang Li 《Science China Chemistry》 SCIE EI CAS CSCD 2021年第4期565-575,共11页
Water/alcohol soluble cathode interfacial materials(CIMs)are playing important roles in optoelectronic devices such as organic light emitting diodes,perovskite solar cells and organic solar cells(OSCs).Herein,n-doped ... Water/alcohol soluble cathode interfacial materials(CIMs)are playing important roles in optoelectronic devices such as organic light emitting diodes,perovskite solar cells and organic solar cells(OSCs).Herein,n-doped solution-processable single-wall carbon nanotubes(SWCNTs)-containing CIMs for OSCs are developed by dispersing SWCNTs to the typical CIMs perylene diimide(PDI)derivatives PDIN and PDINO.The Raman and X-ray photoelectron spectroscopy(XPS)measurement results illustrate the ndoped behavior of SWCNTs by PDIN/PDINO in the blend CIMs.The blended and n-doped SWCNTs can tune the work function and enhance the conductivity of the PDI-derivative/SWCNT(PDI-CNT)composite CIMs,and the composite CIMs can regulate and down-shift the work function of cathode,reduce the charge recombination,improve the charge extraction rate and enhance photovoltaic performance of the OSCs.High power conversion efficiency(PCE)of 17.1%and 17.7%are obtained for the OSCs based on PM6:Y6 and ternary PM6:Y6:PC_(71) BM respectively with the PDI-CNTcomposites CIMs.These results indicate that the ndoped SWCNT-containing composites,like other n-doped nanomaterials such as zero dimensional fullerenes and two dimensional graphenes,are excellent CIMs for OSCs and could find potential applications in other optoelectronic devices. 展开更多
关键词 organic solar cells cathode interfacial materials n-doped single wall carbon nanotubes silver electrode
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Electrochemical Studies of Cytochrome c on Electrodes Modified by Single-Wall Carbon Nanotubes 被引量:5
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作者 程发良 杜珊 金葆康 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2003年第4期436-441,共6页
Single wall carbon nanotubes (SWNTs) modified gold electrodes were prepared by using two different methods. The electrochemical behavior of cytochrome c on the modified gold electrodes was investigated. The first... Single wall carbon nanotubes (SWNTs) modified gold electrodes were prepared by using two different methods. The electrochemical behavior of cytochrome c on the modified gold electrodes was investigated. The first kind of SWNT modified electrode (noted as SWNT/Au electrode) was prepared by the adsorption of carboxyl terminated SWNTs from DMF dispersion on the gold electrode. The oxidatively processed SWNT tips were covalently modified by coupling with amines (AET) to form amide linkage. Via Au—S chemical bonding, the self assembled monolayer of thiol unctionalized nanotubes on gold surface was fabricated so as to prepare the others SWNT modified electrode (noted as SWNT/AET/Au electrode). It was shown from cyclic voltammetry experiments that cytochrome c exhibited direct electrochemical responses on the both electrodes, but only the current of controlled diffusion existed on the SWNT/Au electrode while both the currents of controlled diffusion and adsorption of cytochrome c occurred on the SWNT/AET/Au electrode. Photoelastic Modulation Infared Reflection Absorption Spectroscopy (PEM IRRAS) and Quartz Crystal Microbalance (QCM) were employed to verify the adsorption of SWNTs on the gold electrodes. The results proved that SWNTs could enhance the direct electron transfer process between the electrodes and redox proteins. 展开更多
关键词 single wall carbon nanotubes modified gold electrode PEM IRRAS QCM
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Quantum Chemistry Calculation on Oxygen and Nitrogen Adsorption in Carbon Nanotude
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作者 闵新民 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第1期1-3,共3页
Oxygen and nitrogen adsorption in single walled carbon nanotube (SWCNT) is studied by density function and discrete variational (DFT-DVM) method.The models of O 2 and N 2 adsorption in the SWCNT are optimized based... Oxygen and nitrogen adsorption in single walled carbon nanotube (SWCNT) is studied by density function and discrete variational (DFT-DVM) method.The models of O 2 and N 2 adsorption in the SWCNT are optimized based on the energy minimization.The calculated results of density of state,populations and energy gaps of the molecular orbitals show that oxygen adsorption in SWCNT increases the carbon nanotube`s electrical conductivity more notably than nitrogen adsorption,which is consistent with the experiment. 展开更多
关键词 single walled carbon nanotube quantum chemistry calculation ADSORPTION electronic conductivity
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Improvement of electrical and photovoltaic properties of methyl red dye based photoelectrochemical cells in presence of single walled carbon nanotubes
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作者 Sujata CHAKRABORTY Nabin Baran MANIK 《Frontiers of Optoelectronics》 CSCD 2015年第3期289-297,共9页
In this work, we investigated the effect of single walled carbon nanotubes (SWCNT) on the electrical and photovoltaic properties of methyl red (MR) dye based photoelectrochemical cell (PEC). MR dye based PEC wit... In this work, we investigated the effect of single walled carbon nanotubes (SWCNT) on the electrical and photovoltaic properties of methyl red (MR) dye based photoelectrochemical cell (PEC). MR dye based PEC with LiCl04 as ion salt were fabricated with and without mixing SWCNT. The cells were characterized through electrical and optical measurements. The performance of the devices changed drastically in presence of SWCNT. The transition voltage and trap energy of the cells were estimated from the steady-state dark current voltage (I-V) analysis. The transition voltage and trap energy decreased for MR dye cell in presence of SWCNT. Open circuit voltage (Voc), short circuit current (Jsc), fill factor (FF) and power conversion efficiency (v/) increased due to the addition of SWCNT. Further measurement of the transient photo- current showed that the growth and decay of photocurrent was quite faster in presence of SWCNT. The photocurrent decay with time was fitted for both the cells and found to follow a power law relation which indicates dispersive transport mechanism with exponential trap states distrib- uted in between lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) levels. Possible interpretation is done on the lowering of trap energy with the photocurrent. These results suggest that SWCNT lowers the trap energy of the cells by providing efficient percolation pathways for the conduction of charges. It is expected that due to lowering of trap energy the residing time of the free carriers within the traps decreases. In other words, it may also be said that the charge recombination decreases. These factors affect the overall conduction of charges and improve the electrical and photovoltaic properties. 展开更多
关键词 methyl red (MR) single walled carbon nanotubes (SWCNT) photoelectrochemical cell (PEC) trap energy percolation pathways
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ITO-free silicon-integrated perovskite electrochemical cell for light-emission and light-detection 被引量:2
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作者 Maria Baeva Dmitry Gets +8 位作者 Artem Polushkin Aleksandr Vorobyov Aleksandr Goltaev Vladimir Neplokh Alexey Mozharov Dmitry VKrasnikov Albert GNasibulin Ivan Mukhin Sergey Makarov 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第9期45-58,共14页
Halide perovskite light-emitting electrochemical cells are a novel type of the perovskite optoelectronic devices that differs from the perovskite light-emitting diodes by a simple monolayered architecture.Here,we deve... Halide perovskite light-emitting electrochemical cells are a novel type of the perovskite optoelectronic devices that differs from the perovskite light-emitting diodes by a simple monolayered architecture.Here,we develop a perovskite electrochemical cell both for light emission and detection,where the active layer consists of a composite material made of halide perovskite microcrystals,polymer support matrix,and added mobile ions.The perovskite electrochemical cell of CsPbBr3:PEO:LiTFSI composition,emitting light at the wavelength of 523 nm,yields the luminance more than 7000 cd/m2 and electroluminescence efficiency of 4.3 lm/W.The device fabricated on a silicon substrate with transparent single-walled carbon nanotube film as a top contact exhibits 40%lower Joule heating compared to the perovskite optoelectronic devices fabricated on conventional ITO/glass substrates.Moreover,the device operates as a photodetector with a sensitivity up to 0.75 A/W,specific detectivity of 8.56×1011 Jones,and linear dynamic range of 48 dB.The technological potential of such a device is proven by demonstration of 24-pixel indicator display as well as by successful device miniaturization by creation of electroluminescent images with the smallest features less than 50μm. 展开更多
关键词 composite inorganic halide perovskite silicon single walled carbon nanotubes light-emitting electrochemical cell PHOTODETECTOR indicator display
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Comprehensive study of nanostructured supports with high surface area for Fischer-Tropsch synthesis 被引量:1
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作者 Somayeh Farzad Ali Haghtalab Alimorad Rashidi 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第4期573-581,共9页
An extensive study of Fischer-Tropsch synthesis on nanostructure supports with high surface area such as nanostructure -y-alumina, single wall carbon nanotubes (SWNTs), and the hybrid of SWNTs/nanostructure -y-alumi... An extensive study of Fischer-Tropsch synthesis on nanostructure supports with high surface area such as nanostructure -y-alumina, single wall carbon nanotubes (SWNTs), and the hybrid of SWNTs/nanostructure -y-alumina has been investigated. The nanostructure γ-alumina was promoted with lanthanum to obtain better performance of catalyst and 15 wt% cobalt loading was the basis of our investigation. Fischer- Tropsch synthesis was performed in a fixed bed reactor under different reaction conditions (220-240 ℃, 15-25 bar, H2/CO ratio of 2, GHSV of 900-1400) in order to study the effects of temperature, pressure and gas hourly space velocity (GHSV) changes on hydrocarbon selec- tivity and catalyst activity. The catalysts were extensively characterized by different methods including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma (ICP), hydrogen (H2) chemisorption and temperature-programmed reduction (TPR). The results showed that the yield of hybrid supported catalyst (55.4%) is higher than that of nanos- tructure -y-alumina supported catalyst (55.0%) and lower than that of SWNTs supported cobalt catalyst (71.0%). The hybrid supported catalyst showed higher reduction degree and dispersion of cobalt particles. The temperature, pressure and GHSV effects on hybrid supported catalyst were studied and results showed that higher pressure favors the chain growth and temperature increase leads to the increases in methane selec- tivity and CO conversion. Higher hydrocarbon selectivity and CO conversion showed positive relationship with increasing GHSV while lower hydrocarbon selectivity diminishes. 展开更多
关键词 Fischer-Tropsch synthesis single wall carbon nanotubes nanostructure γ-Al2O3 cobalt catalyst fixed bed reactor
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Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes
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作者 Paul Finnie 《Nano Research》 SCIE EI CAS CSCD 2016年第9期2715-2728,共14页
Tunable filter Raman spectroscopy is used to efficiently produce Raman excitation maps of unpurified and type-purified single walled carbon nanotubes (SWCNTs). Maps with fine excitation resolution (1 nm) are created o... Tunable filter Raman spectroscopy is used to efficiently produce Raman excitation maps of unpurified and type-purified single walled carbon nanotubes (SWCNTs). Maps with fine excitation resolution (1 nm) are created over a wide wavelength range (727 to 980 nm), extending from metallic to semiconducting resonances. At a given wavelength, the wide bandwidth (>3,000 cm–1) allows the comparison of the G band with the radial breathing mode (RBM), and shows the 2D band and other less prominent bands. Materials examined included unsorted powders, aqueous sorted semiconductors, aqueous sorted metals, and polyfluorene sorted semiconductors in toluene. The Raman excitation profiles of the G band are broad, relative to the RBM bands. The maps offer evidence of minority species contamination, except in the case of the polyfluorene sorted semiconductors. Tunable Raman spectroscopy data help validate the simpler fixed wavelength Raman spectroscopy approaches to purity assessment. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg. 展开更多
关键词 single walled carbon nanotube (SWCNT) tunable Raman spectroscop PURITY METALLICITY
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Effect of electric field on metallic SWCNT interconnects for nanoscale technologies 被引量:2
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作者 Harsimran Kaur Karamjit Singh Sandha 《Journal of Semiconductors》 EI CAS CSCD 2015年第3期92-98,共7页
The influence of an electric field on metallic single walled carbon nanotube (SWCNT) interconnects is studied. A voltage-dependent equivalent circuit model is presented for the impedance parameters of single-wall ca... The influence of an electric field on metallic single walled carbon nanotube (SWCNT) interconnects is studied. A voltage-dependent equivalent circuit model is presented for the impedance parameters of single-wall carbon nanotubes that capture various electron-phonon scattering mechanisms as a function of the electric field. To estimate the performance of SWCNT bundle interconnects, signal delay and power dissipation are calculated based on the field dependent model that results in an improvement in the delay and power estimation accuracy compared to the field-independent model. We find that the power delay product of a SWCNT bundle increases with the increase in electric field but decreases with technology scaling showing that at a low electric field, the SWCNT bundle is a potential reliable alternative interconnect for future high performance VLSI industry at scaled technologies. 展开更多
关键词 carbon nanotube single wall carbon nanotube metallic single wall carbon nanotube multiwall carbon nanotube very large scale integration
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Promoting Si-graphite composite anodes with SWCNT additives for half and NCM 811 full lithium ion batteries and assessment criteria from an industrial perspective 被引量:1
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作者 Jingning SHAN Xiaofang YANG +3 位作者 Chao YAN Lin CHEN Fang ZHAO Yiguang JU 《Frontiers in Energy》 SCIE CSCD 2019年第4期626-635,共10页
Single wall carbon nanotube(SWCNT)additives were formulated into(im-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes.The critical role of small amount of SWCNT ad... Single wall carbon nanotube(SWCNT)additives were formulated into(im-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes.The critical role of small amount of SWCNT addition(0.2 wt%)was found for significantly improving delithiation capacity,first cycle coulombic efficiency(FCE),and capacity retention.Particularly,Si(10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92%FCE at 0.2 C during the first chargedischarge cycle,and 91%capacity retention after 50 cycles(0.5 C)in a half cell.Scanning electron microscope(SEM)was used to illustrate the electrode morphology,compositions and promoting function of the SWCNT additives.In addition,full cells assembled with high nickel-NCM811 cathodes and fim-Si-graphite composite anodes were evaluated for the consistence between half and full cell performance,and the consideration for potential commercial application.Finally,criteria to assess Si-containing anodes are proposed and discussed from an industrial perspective. 展开更多
关键词 lithium-ion battery Si anode Si-graphite composite single wall carbon nanotube(SWCNT) NCM811
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Oxidative damage in the kidney and brain of mice induced by different nano-materials 被引量:1
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作者 Shuai SHANG Shang-Yue YANG Zhi-Min LIU Xu YANG 《Frontiers in Biology》 CAS CSCD 2015年第1期91-96,共6页
With the rapid development of nanotechnology, nanomaterials have been used in numerous fields. However, these nanomaterials could also result in risk for human and environmental health. To make a comparison of the hea... With the rapid development of nanotechnology, nanomaterials have been used in numerous fields. However, these nanomaterials could also result in risk for human and environmental health. To make a comparison of the health effects of three different kinds of nanomaterials, 28 male BALB/c mice were randomly divided into four groups. Three experimental groups were exposed to different kinds of nanomaterials including graphene, graphene oxide and single wall carbon nanotubes (SWCNTs) by intraperitoneal injection while the control group received a saline injection. The exposure dose of experimental groups was 4mg/kg. After seven days, sections of mice kidney were taken, the organ coefficient of both kidney and brain was counted, and the reactive oxygen species (ROS) level, glutathione (GSH) and malondialdehyde (MDA) content was measured. Our results showed that in the experimental groups, the organ coefficient and GSH content in mice kidneys and brains decreased, whereas the ROS level and MDA content increased, when compared with the control. The graphene oxide group was statistically significant (p 〈 0.05), while the SWCNTs group had extremely significant difference (p〈0.01). Morphological changes in the kidney were also seen in the experimental groups. These results demonstrate that oxidative damage to mice kidneys and brains induced by SWCNTs and graphene oxide is more severe than graphene. The degree of damage caused by these three typical nanomaterials is different, probably due to several parameters including particle size, surface character, and shape. 展开更多
关键词 GRAPHENE graphene oxide single wall carbon nanotubes oxidative damage
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Structure adapting of bulk FeS_(2) micron particles and the corresponding anode for high performance sodium-ion batteries 被引量:1
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作者 Yong Li Daixin Ye +6 位作者 Wen Liu Rui Guo Haijuan Pei Hongbing Zhao Jiujun Zhang Jingying Xie Jilie Kong 《Journal of Materiomics》 SCIE 2022年第6期1278-1286,共9页
The practical application of Pyrite iron disulfide (FeS_(2)) as anode material of sodium-ion battery is limitedby its low electronic conductivity, large volume changes during charge/discharge. To overcome thesechallen... The practical application of Pyrite iron disulfide (FeS_(2)) as anode material of sodium-ion battery is limitedby its low electronic conductivity, large volume changes during charge/discharge. To overcome thesechallenges, a novel structure design single-walled carbon nanotubes (SWCNTs) composited polyaniline(PANI)-wrapped FeS_(2) (FeS_(2)-PANI-SWCNTs) electrodes are successfully achieved in this work. PANI canprotect the FeS_(2) particles from collapse and offer a protective layer to relive the polysulfides shuttlingeffect, and also promote the electron and Naþ diffusion during the chemical conversion process. Underthe dual protection of PANI and SWCNTs, the FeS_(2)-PANI-SWCNTs film electrode demonstrates a goodstructural integrity, which accounts for the excellent rate capability and long cycling performance. Inaddition, the PANI coating and SWCNT network in the fabricated electrode can synergistically anchorpolysulfides and therefore strongly suppress shuttle effect during the chargeedischarge processes,resulting in less capacity loss. The anode with a loading 3.2 mg cm 2 of FeS_(2) coated with PANI exhibitsthe initial coulombic efficiency of 81.5% and delivers a specific capacity of 625.8 mAh g^(-1) after 100 cyclesat 200 mA g^(-1). High flexible and binder-free FeS_(2)-PANI-SWCNTs film anode demonstrates a reversiblecapacity of 537 mAh g^(-1) after 550 cycles at 1 A g^(-1). This research may offer an efficient method toimprove electrochemical performance of the metal sulfides in sodium-ion batteries. 展开更多
关键词 Pyrite iron disulfide POLYANILINE single wall carbon nanotube Flexible Sodium-ion batteries
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Geometric nonlinear analysis of large rotation behavior of a curved SWCNT
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作者 Prasad Dharap Satish Nagarajaiah Zhiling Li 《International Journal of Smart and Nano Materials》 SCIE EI 2022年第2期218-231,共14页
Nanotubes form clusters and are found in curved bundles in nano-tube films and nanocomposites.Separation phenomenon is sus-pected to occur in these curved bundles.In this study,the deformation of a single-wall carbon ... Nanotubes form clusters and are found in curved bundles in nano-tube films and nanocomposites.Separation phenomenon is sus-pected to occur in these curved bundles.In this study,the deformation of a single-wall carbon nanotube(SWCNT)interacting with curved bundle nanotubes is analyzed.It is assumed that the bundle is rigid and only van der Waals force acts between the nanotube and the bundle of nanotubes.A new method of model-ing geometric nonlinear behavior of the nanotube due to finite rotation and the corresponding van der Waals force is developed using co-rotational finite element method(CFEM)formulation,combined with small deformation beam theory,with the inclusion of axial force.Current developed CFEM method overcomes the limitation of linear Finite Element Method(FEM)formulation regarding large rotations and deformations of carbon nanotubes.This study provides a numerical tool to identify the critical curvature influence on the interaction of carbon nanotubes due to van der Waals forces and can provide more insight into studying irregula-rities in the electronic transport properties of adsorbed nanotubes in nanocomposites. 展开更多
关键词 Key-words:single walled carbon nanotubes corotational finite element formulation structural health monitoring NANOCOMPOSITES jumpphenomenon critical curvature
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