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Effect of Single-walled Carbon Nanotubes on Cellulose Phenylcarbamate Chiral Stationary Phases 被引量:9
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作者 CHANG Yin-xia REN Chao-xing +1 位作者 RUAN Qiong YUAN Li-ming 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第6期646-649,共4页
Single-walled carbon nanotubes(SWNTs) have a high adsorption ability and nanoscale interactions. Cellulose trisphenylcarbamates possess high enantioseparation ability in high-performance liquid chromatography(HPLC... Single-walled carbon nanotubes(SWNTs) have a high adsorption ability and nanoscale interactions. Cellulose trisphenylcarbamates possess high enantioseparation ability in high-performance liquid chromatography(HPLC). Single-walled carbon nanotubes mixed with cellulose trisphenylcarbamate are coated on the silica gel as chiral stationary phases and higher enantioseparation factors are obtained. After a single-walled carbon nanotube is linked to the 6-pesition of cellulose 2,3-bisphenylcarbamate, its enantioseparation resolution increases compared to that of the cellulose trisphenylcarbamate. It is the first time that SWNTs have been applied to enantioseparation. The results indicate that the single-walled carbon nanotubes are good promoters of chiral recognition. This method can be used to improve the enantioseparation efficiency of the polysaccharide chiral stationary phases. 展开更多
关键词 single-walled carbon nanotube Cellulose 2 3-bisphenylcarbamate-6-swnt Cellulose trisphenylcarbamate Chiral stationary phase High-performance liquid chromatography
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ANALYSIS OF MATERIAL MECHANICAL PROPERTIES FOR SINGLE-WALLED CARBON NANOTUBES 被引量:6
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作者 FuYiming XuXiaoxian 《Acta Mechanica Solida Sinica》 SCIE EI 2005年第1期46-51,共6页
Abstract The carbon-carbon bond between two nearest-neighboring atoms is mod- eled as a beam and the single-walled carbon nanotubes are treated as the space frame structures in order to analyze the mechanical properti... Abstract The carbon-carbon bond between two nearest-neighboring atoms is mod- eled as a beam and the single-walled carbon nanotubes are treated as the space frame structures in order to analyze the mechanical properties of carbon nanotubes. Based on the theory of Tersof- Brenner force feld, the energy relationships between the carbon-carbon bond and the beam model are obtained, and the stifness parameters of the beam are determined. By applying the present model, the Young’s moduli of the single-walled carbon nanotubes with diferent tube diameters are determined. And the present results are compared with available data. 展开更多
关键词 single-walled carbon nanotube (carbon swnt) space frame structure Tersof- Brenner force feld Young’s modulus
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Enhanced hydrogen evolution reaction over molybdenum carbide nanoparticles confined inside single-walled carbon nanotubes 被引量:7
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作者 Tingting Cui Jinhu Dong +3 位作者 Xiulian Pan Tie Yu Qiang Fu Xinhe Bao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第1期123-127,共5页
Carbon nanotubes(CNTs) have shown as unique nanoreactors to tune the catalytic activity of confined nano-catalysts. Here we report that the catalytic performance of molybdenum carbide nanoparticles(MoC_x NPs) for the ... Carbon nanotubes(CNTs) have shown as unique nanoreactors to tune the catalytic activity of confined nano-catalysts. Here we report that the catalytic performance of molybdenum carbide nanoparticles(MoC_x NPs) for the hydrogen evolution reaction(HER) process can be enhanced by encapsulation within single-walled carbon nanotubes(SWNTs) with a diameter of 1–2 nm. The catalyst with MoC_x NPs located on the interior surface of SWNTs(MoCx@SWNTs) exhibits a lower onset over-potential and a smaller Tafel slope than the one with MoC_x NPs attached on the exterior surface(MoCx/SWNTs). This is likely attributed to the much smaller particle size and the more reduced states of the confined MoC_x NPs, as well as the larger specific surface area of MoCx@SWNTs compared with Mo Cx/SWNTs. In addition, the electronic structure of the confined MoC_x NPs might be modified by the confinement effects of SWNTs, and hence the adsorption free energy of H atoms on the confined MoC_x NPs, which could also contribute to their higher performance. These results suggest that the SWNTs can be further explored for constructing novel catalysts with beneficial catalytic performance. 展开更多
关键词 single-walled carbon nanotubeS CONFINED catalysis Molybdenum CARBIDE NANOPARTICLES Hydrogen evolution reaction
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Semiconducting single-walled carbon nanotubes synthesized by S-doping 被引量:5
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作者 Z.J.Li L.Wang +2 位作者 Y.J.Su P.Liu Y.F.Zhang 《Nano-Micro Letters》 SCIE EI CAS 2009年第1期9-13,共5页
An approach was presented for synthesis of semiconducting single-walled carbon nanotubes(SWNTs) by sulfur(S) doping with the method of graphite arc discharge. Raman spectroscopy, UV-vis-NIR absorption spectroscopy and... An approach was presented for synthesis of semiconducting single-walled carbon nanotubes(SWNTs) by sulfur(S) doping with the method of graphite arc discharge. Raman spectroscopy, UV-vis-NIR absorption spectroscopy and electronic properties measurements indicated the semconducting properties of the SWNTs samples. Simulant calculation indicated that S doping could induce convertion of metallic SWNTs into semiconducting ones. This strategy may pave a way for the direct synthesis of pure semiconducting SWNTs. 展开更多
关键词 S-doping single-WALL carbon nanotubes SEMICONDUCTING Arc discharge
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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 被引量:1
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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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Production of single-walled carbon nanotubes from methane over Co-Mo/MgO nanocatalyst:A comparative study of fixed and fluidized bed reactors 被引量:4
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作者 Alimorad Rashidi Roghayeh Lotfi +1 位作者 Ehsaneh Fakhrmosavi Masoud Zare 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2011年第4期372-376,共5页
In this study,the performances of fixed and fluidized bed reactors in the production of single-walled carbon nanotubes(SWNTs)have been investigated.In both reactors,single-walled carbon nanotubes were grown by catal... In this study,the performances of fixed and fluidized bed reactors in the production of single-walled carbon nanotubes(SWNTs)have been investigated.In both reactors,single-walled carbon nanotubes were grown by catalytic chemical vapor decomposition(CCVD)of methane over Co-Mo/MgO nanocatalyst under two different operating conditions.The synthesized samples were characterized by TEM,TGA and Raman spectroscopy.It is found that the performance of a fluidized bed in the synthesis of carbon nanotubes is much better than that of a fixed bed.The quality of carbon nanotubes obtained from the fluidized bed was significantly higher than that from the fixed bed and the former one with the ID/IG ratio of 0.11 while the latter one with the ID/IG ratio of 0.71.Also,the yield of SWNTs in the fluidized bed was 92 wt%,while it was 78 wt%in the fixed bed.These advantages of fluidized bed reactors for the synthesis of carbon nanotubes can be attributed to more available space for the growth of carbon nanotubes and more uniform temperature and concentration profiles. 展开更多
关键词 single-walled carbon nanotubes chemical vapor deposition fixed bed reactor fluidized bed reactor
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Molecular Simulation of Hydrogen Adsorption Density in Single-Walled Carbon Nanotubes and Multilayer Adsorption Mechanism 被引量:2
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作者 LianquanGUO ChangxiangMA +2 位作者 ShuaiWANG HeMA XinLI 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第1期123-127,共5页
The adsorption of hydrogen onto single-walled carbon nanotubes (SWCNTs) was studied by molecular dynamics (MD) sim'lation. It was found that the hydrogen molecules distribute regularly inside and outside of the tu... The adsorption of hydrogen onto single-walled carbon nanotubes (SWCNTs) was studied by molecular dynamics (MD) sim'lation. It was found that the hydrogen molecules distribute regularly inside and outside of the tube. Density distribution was computed for H2 molecule. Theoretical analysis of the result showed the multilayer adsorption mechanism of SWCNTs. The storage of H2 in SWCNTs is computed, which provides essential theoretical reference for further study of hydrogen adsorption in SWCNTs. 展开更多
关键词 single-walled carbon nanotubes Molecular dynamics Multilayer adsorption Hydrogen storage
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Electron field emission from single-walled carbon nanotube nonwoven 被引量:2
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作者 宋礼 刘双 +11 位作者 张耿民 刘利峰 马文君 刘东方 赵小伟 罗述东 张增星 向颜娟 沈俊 周建军 王刚 周维亚 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第2期422-427,共6页
Field emission from single-walled carbon nanotube (SWNT) nonwoven has been investigated under high vacuum with different vacuum gaps, A low turn-on electric field of 1.05 V/μm is required to reach an emission curre... Field emission from single-walled carbon nanotube (SWNT) nonwoven has been investigated under high vacuum with different vacuum gaps, A low turn-on electric field of 1.05 V/μm is required to reach an emission current density of 10μA/cm^2. An emission current density of 10 mA/cm^2 is obtained at an operating electric field of 1.88V/μm. No current saturation is found even at an emission current of 5 mA. With the vacuum gap increasing from 1 to 10 mm, the turn-on field decreases monotonically from 1.21 to 0.68 V/μm, while the field amplification is augmented. The good field-emission behaviour is ascribed to the combined effects of the intrinsic field emission of SWNT and the waved topography of the nonwoven. 展开更多
关键词 single-walled carbon nanotubes FIELD
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Synthesis of nitrogen-doped single-walled carbon nanotubes and monitoring of doping by Raman spectroscopy 被引量:2
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作者 吴慕鸿 李晓 +6 位作者 潘鼎 刘磊 杨晓霞 许智 王文龙 隋郁 白雪冬 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第8期215-220,共6页
Nitrogen-doped single-walled carbon nanotubes (CNx-SWNTs) with tunable dopant concentrations were synthesized by chemical vapor deposition (CVD), and their structure and elemental composition were characterized by... Nitrogen-doped single-walled carbon nanotubes (CNx-SWNTs) with tunable dopant concentrations were synthesized by chemical vapor deposition (CVD), and their structure and elemental composition were characterized by using transmission electron microscopy (TEM) in combination with electron energy loss spectroscopy (EELS). By comparing the Raman spectra of pristine and doped nanotubes, we observed the doping-induced Raman G band phonon stiffening and 2D band phonon softening, both of which reflect doping-induced renormalization of the electron and phonon energies in the nan- otubes and behave as expected in accord with the n-type doping effect. On the basis of first principles calculations of the distribution of delocalized carrier density in both the pristine and doped nanotubes, we show how the n-type doping occurs when nitrogen heteroatoms are substitutionally incorporated into the honeycomb tube-shell carbon lattice. 展开更多
关键词 single-walled carbon nanotubes nitrogen doping chemical vapor deposition Raman spectroscopy
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High-speed countercurrent chromatography for purification of single-walled carbon nanotubes 被引量:2
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作者 Ying Cai Zhi Hong Yan +2 位作者 Ying Chun Lv Min Zi Li Ming Yuan 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第11期1345-1348,共4页
A new chromatographic purification of single-walled carbon nanotubes using high-speed countercurrent chromatography is reported. The purification was accomplished on the basis of experiment that dispersed the single-w... A new chromatographic purification of single-walled carbon nanotubes using high-speed countercurrent chromatography is reported. The purification was accomplished on the basis of experiment that dispersed the single-walled carbon nanotubes with sodium dodecyl sulfate, and the result mixture was separated using the two phase system composed of n-butanol/water = 1/1 (v/v). The sizes of SWNTs separated were observed by scanning electron microscopy. The results demonstrated that the high-speed countercurrent chromatography possessed a good efficency for purification of single-walled carbon nanotubes. 展开更多
关键词 High-speed countercurrent chromatography PURIFICATION Sodium dodecyl sulfate single-walled carbon nanotubes
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Density Functional Theory Study of MoO_3 Molecule Encapsulated inside Single-walled Carbon Nanotubes 被引量:2
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作者 李瑞 唐永建 张红 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2012年第11期1634-1640,共7页
The binding energies, geometric structures and electronic properties of molybde- num trioxide (MOO3) molecule encapsulated inside (8, 0), (9, 0), (10, 0) and (14, 0) single-walled carbon nanotubes (SWNTs) ... The binding energies, geometric structures and electronic properties of molybde- num trioxide (MOO3) molecule encapsulated inside (8, 0), (9, 0), (10, 0) and (14, 0) single-walled carbon nanotubes (SWNTs) have been investigated using density functional theory (DFT) method. Due to curvature effect, the calculated binding energy values are different, the variation of which indicated that the stability of MoO3/SWNT systems increases with increasing the radius of SWNTs. At the same time, owing to the presence of MoO3 molecule, the band gap of MoO3/SWNTs systems decreases. The analysis of density of states (DOS) reveals hybridization between C-2p and Mo-4d and between C-2p and O-2p orbitals near the Fermi level, which results in electron transfer from SWNTs to MoO3 molecule. The present computations suggest that electronic properties of SWNTs can be modified by doping MoO3 molecule. 展开更多
关键词 MoO3 molecule single-walled carbon nanotubes density functional theory
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Development of a microcomposite with single-walled carbon nanotubes and Nd_2O_3 for determination of paracetamol in pharmaceutical dosage by adsorptive voltammetry 被引量:1
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作者 Verónica Arancibia Johisner Penagos-Llanos +2 位作者 Edgar Nagles Olimpo García-Beltrán John J.Hurtado 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2019年第1期62-69,共8页
This study presents for the first time a new composite of carbon paste(CP), single-walled carbon nanotubes(SWCNTs) and Nd2 O3(NdOX). This versatile composite(NdOX-SWCNT/CPE) was applied to the oxidation of paracetamol... This study presents for the first time a new composite of carbon paste(CP), single-walled carbon nanotubes(SWCNTs) and Nd2 O3(NdOX). This versatile composite(NdOX-SWCNT/CPE) was applied to the oxidation of paracetamol(PCM). The newly formed surface was characterized by scanning electron microscopy(SEM), electrochemical impedance spectroscopy(EIS) and cyclic voltammetry(CV). The results showed greater conductivity and a higher surface area for the composite than those of the carbon paste alone. Moreover, the anodic peak currents for PCM increased from 1.6 to 3.6 m A with CPE and NdOXSWCNT/CPE, indicating an increase of nearly 51.0% for the anodic peak current. On the other hand, the anodic peak potentials shifted from 0.67 to 0.57 V. The detection limits were 0.05 mmol/L with NdOXSWCNT/CPE and 0.50 mmol/L with SWCNT/CPE. The relative standard deviations(RSDs) were 1.5%(n=7). The accuracy and interference of the methods were evaluated with a urine chemistry control spiked with known quantities of PCM, uric acid, dopamine, ascorbic acid, caffeine, acetylsalicylic acid,tartrazine, sunset yellow, allure red, rutin, morin and metal ions. Finally, the novelty and usefulness of the composite were evaluated to quantify PCM in pharmaceutical dosage forms such as tablets, powders and syrups for children. 展开更多
关键词 PARACETAMOL Neodymium(Ⅲ) Oxide single-walled carbon nanotubes PHARMACEUTICAL DOSAGE
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Broad Microwave Dielectric Property of Single-walled Carbon Nanotube Composites 被引量:1
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作者 Junhua WU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第4期661-666,共6页
Microwave dielectric measurements over the broad bandwith of 10 MHz to 20 GHz were conducted on composites comprising bundles of single-walled carbon nanotubes (SWNT) embedded in an epoxy matrix, in comparison to th... Microwave dielectric measurements over the broad bandwith of 10 MHz to 20 GHz were conducted on composites comprising bundles of single-walled carbon nanotubes (SWNT) embedded in an epoxy matrix, in comparison to the nano-graphite and MWNT. It is found that both relative real and imaginary permittivity of the nanocomposites are strong functions of the SWNT concentration, showing large, wide dielectric and electrical response. Distinct resonance around 1.5 GHz is observed at high SWNT concentrations, accompa- nied by the downshift of the resonance frequency with increasing concentration. Largely, the SWNT-epoxy composites share the behavior of the MWNT owing to structural similarity, much more effective than the nano-graphite. The remarkable, broadband dielectric and electrical properties of the nanotubes acquired in the work originate from their unique seamless graphene architectures, modeled by two major contributions, dielectric relaxation/resonance and electronic conduction, which is substantiated by the agreement between theoretical analysis and experimental results. The carbon nanotube composites are prospective for microwave applications and offer experimental evidence for fundamental studies in low-dimensional systems. 展开更多
关键词 single-walled carbon nanotube Dielectric properties MICROWAVE COMPOSITE
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Direct transition of potential of water droplets to electric energy using aligned single-walled carbon nanotubes 被引量:1
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作者 刘基 郑凯泓 +2 位作者 刘政 胡丽君 孙连峰 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第6期409-414,共6页
In this paper, we report that an electromotive force (EMF) can be induced in a rope of aligned single-walled carbon nanotubes (SWNTs) when water droplets fall on this rope. The magnitude of this EMF depends sensit... In this paper, we report that an electromotive force (EMF) can be induced in a rope of aligned single-walled carbon nanotubes (SWNTs) when water droplets fall on this rope. The magnitude of this EMF depends sensitively on the slant angle of the SWNTs. Most interestingly, both the magnitude and the direction of the induced EFM can be modulated by applying a current to the SWNTs. The concepts of electrical slip and no-slip are proposed and can be quantitatively described by "electrical slip resistance". This kind of generator does not need any magnet, rotor, etc and shows quite a different operating mechanism and design compared with a conventional large scale hydroelectric power generator. 展开更多
关键词 single-walled carbon nanotube water energy conversion
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Thermal properties of single-walled carbon nanotube crystal 被引量:1
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作者 胡丽君 刘基 +3 位作者 刘政 邱彩玉 周海青 孙连峰 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第9期307-311,共5页
In this work, the thermal properties of a single-walled carbon nanotube (SWCNT) crystal are studied. The thermal conductivity of the SWCNT crystal is found to have a linear dependence on temperature in the temperatu... In this work, the thermal properties of a single-walled carbon nanotube (SWCNT) crystal are studied. The thermal conductivity of the SWCNT crystal is found to have a linear dependence on temperature in the temperature range from 1.9 K to 100.0 K. In addition, a peak (658 W/mK) is found at a temperature of about 100.0 K. The thermal conductivity decreases gradually to a value of 480 W/mK and keeps almost a constant in the temperature range from 100.0 K to 300.0 K. Meanwhile, the specific heat shows an obvious linear relationship with temperature in the temperature range from 1.9 K to 300.0 K. We discuss the possible mechanisms for these unique thermal properties of the single-walled carbon nanotube crystal. 展开更多
关键词 single-walled carbon nanotube SWCNT crystal thermal conductivity specific heat
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Electrooxidation of Nitric Oxide at a Glass Carbon Electrode Modified with Functionalized Single-walled Carbon Nanotube 被引量:1
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作者 LI Li SHI Ke-ying 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第6期1025-1030,共6页
The electrocatalytic oxidation of nitric oxide(NO) at a glass carbon electrode(GC) modified with functionalized single-walled carbon nanotubes(SWCNTs) was investigated by cyclic voltammetry(CV) and electrochem... The electrocatalytic oxidation of nitric oxide(NO) at a glass carbon electrode(GC) modified with functionalized single-walled carbon nanotubes(SWCNTs) was investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).It was found that the SWCNT modified electrode could speed greatly up the electron transfer rate compared with the bare GC electrode.After the SWCNT was treated with alkali or mixed acids,the reaction rate and activation energy of NO electrooxidation were changed to different extent.Chemical modification of the SWCNT surface is one of the most powerful methods to change the sensitivity of NO electrooxidation reaction.The modified electrode with SWCNT obtained by the firstly alkali treatment and then the mixed acids treatment was the best one for NO electrooxidation,the result of CV was also confirmed by that of EIS.The anodic processes of NO were recognized more clearly by exploring the reaction mechanism of NO electrooxidation at the SWCNT modified electrode. 展开更多
关键词 single-walled carbon nanotube Modified electrode Nitric oxide Electrocatalytic oxidation Cyclic voltammetry
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Research on the Relationship between Density of States and Conducting Properties of Single-walled Carbon Nanotubes 被引量:1
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作者 ZhenhuaZHANG JingcuiPENG +1 位作者 XiaohuaCHEN JianxiongWANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第2期110-112,共3页
The analytical expression of the electronic density of states (DOS) for single-walled carbon nanotubes (SWNTs) has been derived on the basis of graphene approximation of the energy E(k) near the Fermi level EF. The di... The analytical expression of the electronic density of states (DOS) for single-walled carbon nanotubes (SWNTs) has been derived on the basis of graphene approximation of the energy E(k) near the Fermi level EF. The distinctive properties of the DOS, the normalized differential conductivity and the current us bias for SWNTs are deduced and analyzed theoretically. The singularities in the DOS (or in the normalized differential conductivity) predict that the jump structure of current (or conductance)-bias of SWNTs exists. All conclusions from the theoretical analysis are in well agreement with the experimental results of SWNT's electronic structure and electronic transport. In other words, the simple theoretical model in this paper can be applied to understand a range of spectroscopic and other measurement data related to the DOS of SWNTs. 展开更多
关键词 single-walled carbon nanotubes Graphene approximation of energy Electronic density of states Normalized differential conductivity
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High microwave absorption performances for single-walled carbon nanotube–epoxy composites with ultra-low loadings 被引量:1
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作者 梁嘉杰 黄毅 +4 位作者 张帆 李宁 马延风 李飞飞 陈永胜 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第8期183-188,共6页
Microwave-absorbing polymeric composites based on single-walled carbon nanotubes (SWNTs) are fabricated via a simple yet versatile method, and these SWNT-epoxy composites exhibit very impressive microwave absorption... Microwave-absorbing polymeric composites based on single-walled carbon nanotubes (SWNTs) are fabricated via a simple yet versatile method, and these SWNT-epoxy composites exhibit very impressive microwave absorption perfor- mances in a range of 2 GHz-18 GHz. For instance, a maximum absorbing value as high as 28 dB can be achieved for each of these SWNT-epoxy composites (1.3-mm thickness) with only 1 wt% loading of SWNTs, and about 4.8 GHz bandwidth, corresponding to a microwave absorption performance higher than 10 dB, is obtained. Furthermore, such low and appro- priate loadings of SWNTs also enhance the mechanical strength of the composite. It is suggested that these remarkable results are mainly attributable to the excellent intrinsic properties of SWNTs and their homogeneous dispersion state in the polymer matrix. 展开更多
关键词 microwave absorption single-walled carbon nanotube-epoxy composites ultra-low loadings
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Controlling the Diameter of Single-Walled Carbon Nanotubes by Improving the Dispersion of the Uniform Catalyst Nanoparticles on Substrate 被引量:1
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作者 Junjun Chen Xiangju Xu +1 位作者 Lijie Zhang Shaoming Huang 《Nano-Micro Letters》 SCIE EI CAS 2015年第4期353-359,共7页
To have uniform nanoparticles individually dispersed on substrate before single-walled carbon nanotubes(SWNTs)growth at high temperature is the key for controlling the diameter of the SWNTs.In this letter,a facile app... To have uniform nanoparticles individually dispersed on substrate before single-walled carbon nanotubes(SWNTs)growth at high temperature is the key for controlling the diameter of the SWNTs.In this letter,a facile approach to control the diameter and distribution of the SWNTs by improving the dispersion of the uniform Fe/Mo nanoparticles on silicon wafers with silica layer chemically modified by 1,1,1,3,3,3-hexamethyldisilazane under different conditions is reported.It is found that the dispersion of the catalyst nanoparticles on Si wafer surface can be improved greatly from hydrophilic to hydrophobic,and the diameter and distribution of the SWNTs depend strongly on the dispersion of the catalyst on the substrate surface.Well dispersion of the catalyst results in relatively smaller diameter and narrower distribution of the SWNTs due to the decrease of aggregation and enhancement of dispersion of the catalyst nanoparticles before growth.It is also found that the diameter of the superlong aligned SWNTs is smaller with more narrow distribution than that of random nanotubes. 展开更多
关键词 single-walled carbon nanotube Diameter control Chemical modification Chemical vapor deposition Catalyst nanoparticles
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