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Direct fabrication of flexible tensile sensors enabled by polariton energy transfer based on graphene nanosheet films 被引量:2
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作者 Xi Zhang Junchi Ma +7 位作者 Wenhao Huang Jichen Zhang Chaoyang Lyu Yu Zhang Bo Wen Xin Wang Jing Ye Dongfeng Diao 《Nanotechnology and Precision Engineering》 CAS CSCD 2023年第1期1-11,共11页
A fundamental problem in the direct manufacturing of flexible devices is the low melting temperature of flexible substrates,which hinders the development of flexible electronics.Proposed here is an electron-cyclotron-... A fundamental problem in the direct manufacturing of flexible devices is the low melting temperature of flexible substrates,which hinders the development of flexible electronics.Proposed here is an electron-cyclotron-resonance sputtering system that can batch-fabricate devices directly on flexible substrates under a low temperature by virtue of the polariton energy transfer between the plasma and the material.Flexible graphene nanosheet-embedded carbon(F-GNEC)films are manufactured directly on polyimide,polyethylene terephthalate,and polydimethylsiloxane,and how the substrate bias(electron energy),microwave power(plasma flux and energy),and magnetic field(electron flux)affect the nanostructure of the F-GNEC films is investigated,indicating that electron energy and flux contribute to the formation of standing graphene nanosheets in the film.The films have good uniformity of distribution in a large size(17 mm×17 mm),and tensile and angle sensors with a high gauge factor(0.92)and fast response(50 ms)for a machine hand are obtained by virtue of the unique nanostructure of the F-GNEC film.This work sheds light on the quantum manufacturing of carbon sensors and its applications for intelligent machine hands and virtual-reality technology. 展开更多
关键词 Direct flexible fabrication graphene nanosheets film Polariton energy transfer Flexible sensor Quantum manufacturing
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Sliding wear behavior of copper-based composites reinforced with graphene nanosheets and graphite 被引量:29
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作者 李景夫 张雷 +1 位作者 肖金坤 周科朝 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3354-3362,共9页
The mechanical and tribological properties of hot-pressed copper-based composites containing different amounts of graphene nanosheets(GNSs) are compared with those of copper-graphite(Gr) composites fabricated by t... The mechanical and tribological properties of hot-pressed copper-based composites containing different amounts of graphene nanosheets(GNSs) are compared with those of copper-graphite(Gr) composites fabricated by the same method.The results show that the Cu-GNSs composites exhibit higher relative density,microhardness and bending strength compared with Cu-Gr composites with the same volume fraction of GNSs and Gr.Moreover,the friction coefficients and wear rates reduce significantly by the addition of GNSs,whereas the limited impact on reducing friction and wear is found on graphite.The abrasive and delamination wear are the dominant wear mechanisms of the composites.It is believed that the superior mechanical and tribological performances of Cu-GNSs composites are attributed to the unique strengthening effect as well as the higher lubricating efficiency of graphene nanosheets compared with those of graphite,which demonstrates that GNS is an ideal filler for copper matrix composites,acting as not only an impactful lubricant but also a favorable reinforcement. 展开更多
关键词 graphene nanosheets GRAPHITE COMPOSITE friction coefficient wear mechanism
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Ultrafine SnSSe/multilayer graphene nanosheet nanocomposite as a high-performance anode material for potassium-ion half/full batteries 被引量:3
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作者 Zuyue Yi Jingyi Xu +4 位作者 Zhenhua Xu Min Zhang Yanan He Jianchun Bao Xiaosi Zhou 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第9期241-248,共8页
Layer-structured Shsse attracts much attention as an anode material for potassium storage due to its la rge theoretical capacity.Unfortunately,their practical application is severely restrained by the dramatic volumet... Layer-structured Shsse attracts much attention as an anode material for potassium storage due to its la rge theoretical capacity.Unfortunately,their practical application is severely restrained by the dramatic volumetric variation of SnSSe.Herein,we synthesize ultrafine SnSSe/multilayer graphene nanosheet(SnSSe/MGS) by a vacuum solid-phase reaction and subsequent ball milling.Owing to the strong synergistic effect between the two components,the obtained SnSSe/MGS nanocomposite exhibits a high reversible capacity(423 mAh g^(-1) at 100 mA g^(-1)),excellent rate property(218 mAh g^(-1) at 5 A g^(-1)),and stable cycling performance(271 mAh g^(-1) after 500 cycles at 100 mA g^(-1)) in potassium-ion half batteries.Moreover,the full cell assembled by the SnSSe/MGS anode and the potassiated 3,4,9,10-perylene-tetracar boxylic aciddianhydride cathode shows excellent electrochemical performance between 0.2 and 3.3 V(209 mAh g^(-1) at 50 mA g^(-1) after 100 cycles).The presented two-step synthesis strategy of SnSSe/MGS may also provide ideas to craft other alloy-type anode materials. 展开更多
关键词 Ultrafine SnSSe Multilayer graphene nanosheet Potassium-ion batteries Anode Full cell
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Development of an Ultra-Sensitive and Flexible Piezoresistive Flow Sensor Using Vertical Graphene Nanosheets 被引量:3
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作者 Sajad Abolpour Moshizi Shohreh Azadi +4 位作者 Andrew Belford Amir Razmjou Shuying Wu Zhao Jun Han Mohsen Asadnia 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第9期26-43,共18页
This paper suggests development of a flexible,lightweight,and ultra-sensitive piezoresistive flow sensor based on vertical graphene nanosheets(VGNs) with a mazelike structure.The sensor was thoroughly characterized fo... This paper suggests development of a flexible,lightweight,and ultra-sensitive piezoresistive flow sensor based on vertical graphene nanosheets(VGNs) with a mazelike structure.The sensor was thoroughly characterized for steady-state and oscillatory water flow monitoring applications.The results demonstrated a high sensitivity(103.91 mV(mm/s)-1) and a very low-velocity detection threshold(1.127 mm s-1) in steady-state flow monitoring.As one of many potential applications,we demonstrated that the proposed VGNs/PDMS flow sensor can closely mimic the vestibular hair cell sensors housed inside the semicircular canals(SCCs).As a proof of concept,magnetic resonance imaging of the human inner ear was conducted to measure the dimensions of the SCCs and to develop a 3D printed lateral semicircular canal(LSCC).The sensor was embedded into the artificial LSCC and tested for various physiological movements.The obtained results indicate that the flow sensor is able to distinguish minute changes in the rotational axis physical geometry,frequency,and amplitude.The success of this study paves the way for extending this technology not only to vestibular organ prosthesis but also to other applications such as blood/urine flow monitoring,intravenous therapy(Ⅳ),water leakage monitoring,and unmanned underwater robots through incorporation of the appropriate packaging of devices. 展开更多
关键词 Vertical graphene nanosheets Artificial vestibular system Bioinspired sensors Piezoresistive sensors
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The Effect of Thermal Exfoliation Temperature on the Structure and Supercapacitive Performance of Graphene Nanosheets 被引量:3
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作者 Haiyang Xian Tongjiang Peng +1 位作者 Hongjuan Sun Jiande Wang 《Nano-Micro Letters》 SCIE EI CAS 2015年第1期17-26,共10页
Graphene nanosheets(GSs) were prepared from graphite oxide by thermal exfoliation method. The effect of thermal exfoliation temperature on the structure and supercapacitive performance of GSs has been investigated. Th... Graphene nanosheets(GSs) were prepared from graphite oxide by thermal exfoliation method. The effect of thermal exfoliation temperature on the structure and supercapacitive performance of GSs has been investigated. The results show that the GSs with pore sizes center around 4.0 nm. With an increase of thermal reduction temperature, the number of stacking layers and the structure disorder degree increase, while the oxygen-containing groups content, BET surface area,and electrical resistivity of GSs decrease. The results indicate that 673 K is the preferable thermal exfoliation temperature to acquire good supercapacitive performance. In this case, the GSs have the best supercapacitive performance(233.1 F g-1) in a 6 mol L-1KOH electrolyte. The prepared GSs at the preferable thermal exfoliation temperature have good rate performance and cycle stability. 展开更多
关键词 graphene nanosheets Thermal exfoliation temperature Supercapacitive performance
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Atomic Layer Coated Al_(2)O_(3) on Nitrogen Doped Vertical Graphene Nanosheets for High Performance Sodium Ion Batteries 被引量:3
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作者 Zhiheng Wu Xiangdan Zhang +4 位作者 Lijun Deng Yongshang Zhang Zhuo Wang Yonglong Shen Guosheng Shao 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2022年第1期285-294,共10页
Heteroatom doped graphene materials are considered as promising anode for high-performance sodium-ion batteries(SIBs).Defective and porous structure especially with large specific surface area is generally considered ... Heteroatom doped graphene materials are considered as promising anode for high-performance sodium-ion batteries(SIBs).Defective and porous structure especially with large specific surface area is generally considered as a feasible strategy to boost reaction kinetics;however,the unwanted side reaction at the anode hinders the practical application of SIBs.In this work,a precisely controlled Al_(2)O_(3)coated nitrogen doped vertical graphene nanosheets(NVG)anode material has been proposed,which exhibits excellent sodium storage capacity and cycling stability.The ultrathin Al_(2)O_(3)coating on the NVG is considered to help construct an advantageous interface between electrode and electrolyte,both alleviating the electrolyte decomposition and enhancing sodium adsorption ability.As a result,the optimal Al_(2)O_(3)coated NVG materials delivers a high reversible capacity(835.0 mAh g^(-1))and superior cycling stability(retention of 92.3%after 5000 cycles).This work demonstrates a new way to design graphene-based anode materials for highperformance sodium-ion batteries. 展开更多
关键词 Al_(2)O_(3) nitrogen doped vertical graphene nanosheets reaction kinetics sodium-ion batteries
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High-performance solid-solution potassium-ion intercalation mechanism of multilayered turbostratic graphene nanosheets
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作者 Jiae Um Seung Uk Yoon +4 位作者 Hoseong Kim Beom Sik Youn Hyoung-Joon Jin Hyung-Kyu Lim Young Soo Yun 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第4期814-823,共10页
The solid-solution reaction between an alkali cation and an active host material is known as a singlephase redox mechanism,and it is typically accompanied by a continuous voltage change.It is distinct from the typical... The solid-solution reaction between an alkali cation and an active host material is known as a singlephase redox mechanism,and it is typically accompanied by a continuous voltage change.It is distinct from the typical alkali cation intercalation reaction at an equivalent site of the active host material,which exhibits a voltage plateau.Herein,we report an unusual solid-solution potassium-ion intercalation mechanism with a low-voltage plateau capacity on multilayered turbostratic graphene nanosheets(T-GNSs).Despite the disordered graphitic structure with a broad range of d-spacings(3.65–4.18À),the T-GNSs showed a reversible plateau capacity of~200 m A h g^(-1),which is higher than that of a well-ordered graphite nanoplate(~120 m A h g^(-1)).In addition,a sloping capacity of~220 m A h g^(-1)was delivered with the plateau capacity,and higher rate capabilities,better reversibility,and a more stable cycling performance were confirmed on the turbostratic microstructure.First-principles calculations suggest that the multitudinous lattice domains of the T-GNSs contain diverse intercalation sites with strong binding energies,which could be the origin of the high-performance solid-solution potassium-ion intercalation behavior when the turbostratic graphene stacks have a d-spacing smaller than that of equilibrium potassium–graphite intercalation compounds(5.35À). 展开更多
关键词 Turbostratic graphite graphene nanosheet Defective carbon Anode Potassium-ion batteries
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Direct synthesis of graphene nanosheets support Pd nanodendrites for electrocatalytic formic acid oxidation
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作者 杨苏东 陈琳 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第11期539-543,共5页
We report a solvothermal method preparation of dendritic Pd nanoparticles (DPNs) and spherical Pd nanoparticles (SPNs) supported on reduced graphene oxide (RGO). Drastically different morphologies of Pd NPs with... We report a solvothermal method preparation of dendritic Pd nanoparticles (DPNs) and spherical Pd nanoparticles (SPNs) supported on reduced graphene oxide (RGO). Drastically different morphologies of Pd NPs with nanodendritic structures or spherical structures were observed on graphene by controlling the reduction degree of graphene oxide (GO) un- der mild conditions. In addition to being a commonplace substrate, GO plays a more important role that relies on its surface groups, which serves as a shape-directing agent to direct the dendritic growth. As a result, the obtained DPNs/RGO catalyst exhibits a significantly enhanced electro-catalytic behavior for the oxidation of formic acid compared to the SPNs/RGO catalyst. 展开更多
关键词 graphene nanosheet Pd nanostructure nanodendrite ELECTROCATALYST
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Co-synthesis of vertical graphene nanosheets and high-value gases using inductively coupled plasma enhanced chemical vapor deposition
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作者 Jian YANG Ruiyang XU +4 位作者 Angjian WU Xiaodong LI Li LI Wangjun SHEN Jianhua YAN 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第12期86-95,共10页
One-step controllable synthesis of vertical graphene nanosheets (VGs) and high-value gases was achieved using inductively coupled plasma enhanced chemical vapor deposition (ICPECVD). The basic physical properties ... One-step controllable synthesis of vertical graphene nanosheets (VGs) and high-value gases was achieved using inductively coupled plasma enhanced chemical vapor deposition (ICPECVD). The basic physical properties of the ICPECVD process were revealed via electrical diagnosis and optical emission spectroscopy. The coil current and voltage increased linearly with the augmenting of injected power, and CH, C2, H2 and H were detected at a wavelength from 300 to 700 nm, implying the generation of abundant graphene-building species. The morphology and structure of solid carbon products, graphene nanosheets, were systemically characterized in terms of the variations of operating conditions, such as pressure, temperature, gas proportion, etc. The results indicated that an appropriate operating condition was indispensable for the growth process of graphene nanosheets. In the present work, the optimized result was achieved at the pressure, heating temperature, applied power and gas proportion of 600 mTorr, 800 ~C, 500 W and 20:20:15, respectively, and the augmenting of both CH4 and H2 concentrations had a positive effect on the etching of amorphous carbon. Additionally, H2 and C2 hydrocarbons were detected as the main exhaust gases. The selectivity of H2 and C2H2, measured in exhaust gases, reached up to 52% and 8%, respectively, which implied a process of free radical reactions and electron collision dissociation. Based on a comprehensive investigation of spectral and electrical parameters and synthesized products, the reaction mechanism of collision, dissociation, diffusion, etc, in ICPECVD could be speculated, providing a probable guide for experimental and industrial applications. 展开更多
关键词 vertical graphene nanosheets gaseous products OES electrical diagnosis ICPECVD
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Secondary electron emission yield from vertical graphene nanosheets by helicon plasma deposition
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作者 Xue-Lian Jin Pei-Yu Ji +2 位作者 Lan-Jian Zhuge Xue-Mei Wu Cheng-Gang Jin 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第2期613-617,共5页
The secondary electron emission yields of materials depend on the geometries of their surface structures.In this paper,a method of depositing vertical graphene nanosheet(VGN)on the surface of the material is proposed,... The secondary electron emission yields of materials depend on the geometries of their surface structures.In this paper,a method of depositing vertical graphene nanosheet(VGN)on the surface of the material is proposed,and the secondary electron emission(SEE)characteristics for the VGN structure are studied.The COMSOL simulation and the scanning electron microscope(SEM)image analysis are carried out to study the secondary electron yield(SEY).The effect of aspect ratio and packing density of VGN on SEY under normal incident condition are studied.The results show that the VGN structure has a good effect on suppressing SEE. 展开更多
关键词 secondary electron emission secondary electron yield vertical graphene nanosheets scanning electron microscope
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Synthesis of SiC/graphene nanosheet composites by helicon wave plasma
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作者 Jia-Li Chen Pei-Yu Ji +2 位作者 Cheng-Gang Jin Lan-Jian Zhuge Xue-Mei Wu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第7期339-344,共6页
We report an approach to the rapid, one-step, preparation of a variety of wide-bandgap silicon carbide/graphene nanosheet(Si C/GNSs) composites by using a high-density helicon wave plasma(HWP) source. The microstructu... We report an approach to the rapid, one-step, preparation of a variety of wide-bandgap silicon carbide/graphene nanosheet(Si C/GNSs) composites by using a high-density helicon wave plasma(HWP) source. The microstructure and morphology of the Si C/GNSs are characterized by using scanning electron microscopy(SEM), Raman spectroscopy, x-ray diffraction(XRD), x-ray photoelectron spectroscopy(XPS), and fluorescence(PL). The nucleation mechanism and the growth model are discussed. The existence of Si C and graphene structure are confirmed by XRD and Raman spectra.The electron excitation temperature is calculated by the intensity ratio method of optical emission spectroscopy. The main peak in the PL test is observed at 420 nm, with a corresponding bandgap of 2.95 e V that indicates the potential for broad application in blue light emission and ultraviolet light emission, field electron emission, and display devices. 展开更多
关键词 helicon wave plasma SiC/graphene nanosheet x-ray photoelectron spectroscopy(XPS) FLUORESCENCE
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Auxiliary ball milling to prepare WS_(2)/graphene nanosheets composite for lithium-ion battery anode materials 被引量:2
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作者 Yong-Lin Wu Jia-Bin Hong +3 位作者 Wei-Xu Zhong Chun-Xiang Wang Zhi-Feng Li Sydorov Dmytro 《Tungsten》 EI CSCD 2024年第1期124-133,共10页
A novel nano-WS_(2)/graphene nanosheets(GNSs)composite is obtained by ball milling with xylitol as auxiliary agent and hightemperature sintering.Xylitol improves the shear force during ball milling and well overcomes ... A novel nano-WS_(2)/graphene nanosheets(GNSs)composite is obtained by ball milling with xylitol as auxiliary agent and hightemperature sintering.Xylitol improves the shear force during ball milling and well overcomes the van der Waals interactions between the interlayer of graphite and WS_(2).Through high-temperature calcination,GNSs and WS_(2) nanosheets can form tight interface contact.The produced WS_(2)/GNSs composites can be used as anode materials for lithium-ion batteries,while maintaining a high reversible specific capacity of 705 mAh·g^(-1)with the capacity retention of 95%at a current density of 250 mA·g^(-1)after 200 cycles,mainly because WS_(2)/GNSs composites have a higher Li^(+)diffusion coefficient of 2.2×10^(-9)cm^(2)·s^(-1)and a higher specific surface area of 70.10 m^(2)·g^(-1).As a result,the xylitol-assisted ball milling method designed in this work is suitable for extended preparation of peeling of two-dimensional layer materials into nanosheets. 展开更多
关键词 Lithium-ion battery Anode material WS_(2) graphene nanosheets Auxiliary ball milling
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Corrosion Behavior of Graphene Nanosheets Reinforced Magnesium Matrix Composites in Simulated Body Fluids
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作者 Liwen Chen Jianhui Jing +6 位作者 Lulu Zhang Jing Li Weipeng Chen Limin Li Yuan Zhao Hua Hou Yuhong Zhao 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2024年第3期525-536,共12页
Magnesium(Mg)alloy is considered as a promising biodegradable implant material but restricted to rapid degradation.Here,the new strategies based on thixomolding process had been explored to utilize the outstanding ant... Magnesium(Mg)alloy is considered as a promising biodegradable implant material but restricted to rapid degradation.Here,the new strategies based on thixomolding process had been explored to utilize the outstanding anti-permeability of graphene nanosheets(GNPs)while inhibit its galvanic corrosion with the matrix,so as to improve the corrosion resistance of composites.The agglomerate of GNPs with 0.9 wt%content is the main reason for the deterioration of corrosion performance due to the formation of micro-galvanic corrosion.The grain refinement of composites with 0.6 wt%content had positive effects on the better corrosion resistance.After process adjusting,the unique distributions of GNPs along grain boundaries play a vital role in improving the corrosion resistance.It can be ascribed to the following mechanisms:(I)The barriers can be established between the Mg matrix and corrosive medium,hence blocking the charge transfer at the interface;(II)The GNPs can effectively promote apatite deposition on the Mg matrix,leading to form dense apatite layers and prevent the further invasion of SBF;(III)The GNPs acting as reinforcements exists in the corrosion layer and apatite layer,impede the apatite layer falling off from the Mg matrix.These findings broaden the horizon for biomedical applications in Mg matrix composites to realize desired performances. 展开更多
关键词 Magnesium matrix composite graphene nanosheets Corrosion resistance
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Carbon nanofibers membrane bridged with graphene nanosheet and hyperbranched polymer for high-performance osmotic energy harvesting 被引量:1
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作者 Weijie Wang Jinlin Hao +4 位作者 Qian Sun Minqi Zhao Huiyi Liu Chao Li Xin Sui 《Nano Research》 SCIE EI CSCD 2023年第1期1205-1211,共7页
Reverse electrodialysis(RED),based on ion-selective membranes,is one of the most promising technologies for capturing osmotic energy.As key elements of the RED system,ion-selective membranes must meet the crucial dema... Reverse electrodialysis(RED),based on ion-selective membranes,is one of the most promising technologies for capturing osmotic energy.As key elements of the RED system,ion-selective membranes must meet the crucial demands of mechanical stability,anti-fouling characteristics,easy fabrication,and high power density;however,this still remains a challenge.In this study,we demonstrated a large-scale,mechanically stable,and high-porosity membrane obtained by combining carbon nanomaterials and hyperbranched polyethyleneimine(h-PEI),thereby achieving a high power density of 5.0 W·m−2 with seawater and river water.Carbon nanofibers(CNFs)were subsequently bridged with graphene and h-PEI to strengthen the interaction between the CNFs,reduce the channel size and increase the space charge density,mechanical strength,and toughness.The large-scale and mechanically stable membrane fabricated using the modified CNFs exhibited anion selectivity and high ionic conductivity,thereby achieving a high-performance osmotic energy conversion.Furthermore,the anti-fouling property of the membrane was confirmed by the stability of the osmotic energy conversion in a solution with algae,which can be attributed to the high porosity of carbon nanomaterials.This economic and convenient method for the ion-selective membrane preparation is believed to be promising for large-scale osmotic energy harvesting. 展开更多
关键词 carbon nanofibers graphene nanosheet bridged structure hyperbranched polymer osmotic energy harvesting
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Polyurethane foam-supported three-dimensional interconnected graphene nanosheets network encapsulated in polydimethylsiloxane to achieve significant thermal conductivity enhancement
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作者 Wenjing Li Ni Wu +6 位作者 Sai Che Li Sun Hongchen Liu Guang Ma Ye Wang Chong Xu Yongfeng Li 《Frontiers of Materials Science》 SCIE CSCD 2023年第3期145-153,共9页
Polyurethane(PU)foams are widely used in thermal management materials due to their good flexibility.However,their low thermal conductivity limits the efficiency.To address this issue,we developed a new method to produ... Polyurethane(PU)foams are widely used in thermal management materials due to their good flexibility.However,their low thermal conductivity limits the efficiency.To address this issue,we developed a new method to produce tannic acid(TA)-modified graphene nanosheets(GTs)-encapsulated PU(PU@GT)foams using the soft template microstructure and a facile layer-by-layer(L-B-L)assembly method.The resulting PU@GT scaffolds have ordered and tightly stacked GTs layers that act as three-dimensional(3D)highly interconnected thermal networks.These networks are further infiltrated with polydimethylsiloxane(PDMS).The through-plane thermal conductivity of the polymer composite reaches 1.58 W·m^(−1)·K^(−1) at a low filler loading of 7.9 wt.%,which is 1115%higher than that of the polymer matrix.Moreover,the mechanical property of the composite is~2 times higher than that of the polymer matrix while preserving good flexibility of the polymer matrix owing to the retention of the PU foam template and the construction of a stable 3D graphene network.This work presents a facile and scalable production approach to fabricate lightweight PU@GT/PDMS polymer composites with excellent thermal and mechanical performance,which implies a promising future in thermal management systems of electronic devices. 展开更多
关键词 graphene nanosheet polyurethane foam polymer composite thermal and mechanical property
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Tribological properties of copper matrix composites reinforced with homogeneously dispersed graphene nanosheets 被引量:11
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作者 Xin Gao Hongyan Yue +5 位作者 Erjun Guo Shaolin Zhang Longhui Yao Xuanyu Lin Bao Wang Enhao Guan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第10期1925-1931,共7页
Graphene reinforced copper matrix composites (Gr/Cu) were fabricated by electrostatic self-assembly and powder metallurgy. The morphology and structure of graphene oxide, graphene oxide-Cu powders and Gr/Cu composit... Graphene reinforced copper matrix composites (Gr/Cu) were fabricated by electrostatic self-assembly and powder metallurgy. The morphology and structure of graphene oxide, graphene oxide-Cu powders and Gr/Cu composites were characterized by scanning electronic microscopy, transmission electronic microscopy, X-ray diffraction and Raman spectroscopy, respectively. The effects of graphene contents, applied loads and sliding speeds on the tribological behavior of the composites were investigated. The results indicate that the coefficient of friction of the composites decreases first and then increases with increasing the graphene content. The lowest friction coefficient is achieved in 0.3 wt~ Gr/Cu composite, which decreases by 65% compared to that of pure copper. The coefficient of friction of the composite does not have significant change with increasing the applied load, however, it increases with increasing the sliding speed. The tribological mechanisms of the composite under different conditions were also investigated. 展开更多
关键词 graphene nanosheets Copper matrix composites Tribological properties MICROSTRUCTURE
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Graphene nanosheet as support of catalytically active metal particles in DMC synthesis 被引量:6
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作者 Jun Bian Xiao Wei Wei +1 位作者 Ling Wang Zheng Ping Guan 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第1期57-60,共4页
Novel graphene nanosheet (GNS) supported Cu-Ni bimetal catalysts were firstly synthesized and used for the direct synthesis of dimethyl carbonate (DMC). The experimental results demonstrated that GNS was an effect... Novel graphene nanosheet (GNS) supported Cu-Ni bimetal catalysts were firstly synthesized and used for the direct synthesis of dimethyl carbonate (DMC). The experimental results demonstrated that GNS was an effective and convenient support for the fabrication of Cu-Ni/GNS bimetal catalyst. 展开更多
关键词 graphene nanosheet (GNS) Dimethyl carbonate Carbon dioxide Cu-Ni bimetal catalyst CATALYSIS
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CRYSTALLIZATION BEHAVIOR, THERMAL AND MECHANICAL PROPERTIES OF PHBV/GRAPHENE NANOSHEET COMPOSITES 被引量:3
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作者 Bing-jie Wang Yu-jie Zhang +4 位作者 Jian-qiang Zhang Qu-ting Gou Zong-bao Wang Peng Chen 顾群 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2013年第4期670-678,共9页
Biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/graphene nanosheet (GNS) composites were prepared via a solution-casting method at low GNS loadings in this work. Transmission electron microscop... Biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/graphene nanosheet (GNS) composites were prepared via a solution-casting method at low GNS loadings in this work. Transmission electron microscopy revealed that a fine dispersion of GNSs was achieved in the PHBV matrix. The thermal properties of the nanocomposites were investigated by thermogravimetric analysis, and the results showed that the thermal stability of PHBV was significantly improved with a very low loading of GNSs. Nonisothermal melts crystallization behavior, spherulitic morphology and crystal structure of neat PHBV and the PHBV/GNSs nanocomposites were investigated, and the experimental results indicated that crystallization behavior of PHBV was enhanced by the presence of GNSs due to the heterogeneous nucleation effect; however, the two-dimensional (2D) GNSs might restrict the mobility of the PHBV chains in the process of crystal growing. Dynamic mechanical analysis studies showed that the storage modulus of the PHBV/GNSs nanocomposites was greatly improved. 展开更多
关键词 PHBV graphene nanosheets NANOCOMPOSITES Solution-casting films.
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Superhydrophobic,photo-sterilize,and reusable mask based on graphene nanosheet-embedded carbon(GNEC)film 被引量:1
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作者 Zezhou Lin Zheng Wang +1 位作者 Xi Zhang Dongfeng Diao 《Nano Research》 SCIE EI CAS CSCD 2021年第4期1110-1115,共6页
The 2019 coronavirus disease(COVID-19)has affected more than 200 countries.Wearing masks can effectively cut off the virus spreading route since the coronavirus is mainly spreading by respiratory droplets.However,the ... The 2019 coronavirus disease(COVID-19)has affected more than 200 countries.Wearing masks can effectively cut off the virus spreading route since the coronavirus is mainly spreading by respiratory droplets.However,the common surgical masks cannot be reused,resulting in the increasing economic and resource consumption around the world.Herein,we report a superhydrophobic,photo-sterilize,and reusable mask based on graphene nanosheet-embedded carbon(GNEC)film,with high-density edges of standing structured graphene nanosheets.The GNEC mask exhibits an excellent hydrophobic ability(water contact angle:157.9°)and an outstanding filtration efficiency with 100%bacterial filtration efficiency(BFE).In addition,the GNEC mask shows the prominent photo-sterilize performance,heating up to 110℃quickly under the solar illumination.These high performances may facilitate the combat against the COVID-19 outbreaks,while the reusable masks help reducing the economic and resource consumption. 展开更多
关键词 COVID-19 graphene nanosheet SUPERHYDROPHOBIC photo-sterilize
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Graphene Nanosheets Decorated with Copper Oxide Nanoparticles for the Photodegradation of Methylene Blue 被引量:1
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作者 Samavia RAFIQ Zulfiqar Ali RAZA +1 位作者 Muhammad ASLAM Muhammad Junaid BAKHTIYAR 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2022年第6期1518-1525,共8页
Textile industries extensively use colorants,such as methylene blue,and if disposed off untreated,they contaminate the effluent streams,causing a severe impact on the environment and aquatic life.Photocatalytic degrad... Textile industries extensively use colorants,such as methylene blue,and if disposed off untreated,they contaminate the effluent streams,causing a severe impact on the environment and aquatic life.Photocatalytic degradation has been found as an inevitable approach to treat them.Herein,we decorated the copper oxide nanoparticles on graphene nanosheets during the reflux process.The resultant copper oxide/graphene nanocomposites were analyzed for structural and functional attributes.It was observed that on increasing the copper oxide contents,the z-average size of the resultant nanocomposites decreased.The X-ray diffraction analysis demonstrated the crystalline nature of the nanocomposite.The surface morphology of the copper oxide nanoparticles appeared to be spherical and that of the copper oxide/graphene composite somehow wrinkled.The infrared analysis indicated successful intercalation of precursors in the nanocomposite.The bandgap of copper oxide/graphene nanocomposites varied in the range of 1.03—1.30 eV,which indicated their effective photocatalytic activity.The results demonstrated that after 120 min of exposure,the methylene blue removal efficiency reached 94.0%,92.2%,and 89.4%(mass fraction)on the copper oxide/graphene nanocomposite at copper oxide nanoparticles to graphene nanosheets ratios of 1:1,1.5:1,and 2:1(mass ratio),respectively.The photodegradation performance of the prepared nano-catalyst was found satisfactory even after five cycles. 展开更多
关键词 Copper oxide graphene nanosheet Methylene blue PHOTOCATALYSIS
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