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Preparation of multi-walled carbon nanotube–Fe composites and their application as light weight and broadband electromagnetic wave absorbers

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Chinese Physics B 2014年第11期23卷 552-555页

作者：刘渊刘祥萱王煊军 No.603 Faculty Xi'an Research Institute of High Technology

multi-walled carbon nanotube （MWCNT）-Fe composites were prepared via the metal organic chemical vapor deposi- tion by depositing iron pentacarbonyl on the surface of MWCNTs. The structural and morphological analyses demonstrated that Fe nanoparticles were deposited on the surface of the MWCNTs. The electromagnetic properties of the MWCNTs were significantly changed, and the absorbing capacity evidently improved after the Fe deposition on the MWCNT surface. A minimum reflection loss of -29.4 dB was observed at 8.39 GHz, and the less than -10 dB bandwidth was about 10.6 GHz, which covered the whole X band （8.2-12.4 GHz） and the whole Ku band （12.4-18 GHz）, indicating that the MWCNT-Fe composites could be used as an effective microwave absorption material.

关键词： multi-walled carbon nanotube nano composites electrical properties microwave absorber

Crystallization Behavior and Mechanical Properties of Poly(vinylidene fluoride)/multi-walled carbon nanotube Nanocomposites

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Chemical Research in Chinese Universities 2010年第3期26卷 491-495页

作者： XU Yue ZHENG Wei-tao YU Wen-xue HUA Li-gui ZHANG Yu-jie ZHAO Zhu-di Key Laboratory of Automobile Materials of Ministry of Edueation Test Science Experiment Center Jilin University Changchun 130012 P. R. China Jilin Province Product Quality Supervision Test Institute Changchun 130022 P R. China

Poly（vinylidene fluoride）（PVDF）/multi-walled carbon nanotube（MWCNT） nanocomposites were prepared by means of ultrasonic dispersion method. X-ray diffraction（XRD） results indicate that incorporating MWCNTs into PVDF caused the formation of β phase. A thermal annealing at 130 ℃ confirmed that the β phase was stable in the nanocomposites. Differential scanning calorimetry（DSC） results indicate that the melting temperature slightly increased while the heat of fusion markedly decreased with increasing MWCNT content. The tensile strength and modulus of PVDF were improved by loading the MWCNTs. The scanning electron microscopy（SEM） observations showed that MWCNTs were uniformly dispersed in the PVDF matrix and an interfacial adhesion between MWCNT and PVDF was achieved, which was responsible for the enhancement in the tensile strength and modulus of PVDE.

关键词： multi-walled carbon nanotube Poly(vinylidene fluoride) Composite Crystalline structure Mechanical property

Electrochemical performance of a three-layer electrode based on Bi nanoparticles,multi-walled carbon nanotube composites for simultaneous Hg(Ⅱ)and Cu(Ⅱ)detection

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Chinese Chemical Letters 2020年第10期31卷 2752-2756页

作者： Qiwen Bao Gang Li Zhengchun Yang Peng Pan Jun Liu Jiayuan Chang Jun Wei Ling Lin School of Precision Instrument and Optoelectronic Engineering the State Key Laboratory of Precision Measuring Technology and InstrumentsTianjin University Tianjin 300072China School of Electrical and Electronic Engineering Tianjin Key Laboratory of Film Electronic&Communication DevicesAdvanced Materials and Printed Electronics CenterTianjin University of TechnologyTianjin 300384China Agency for Science Technology and Research(A*STAR)Singapore Institute of Manufacturing TechnologySingapore 638075Singapore

Electrochemical analysis is a promising technique for detecting biotoxic and non-biodegradable heavy *** article proposes a novel composite electrode based on a polyaniline(PANi)fra mework doped with bismuth nanoparticle@graphene oxide multi-walled carbon nano tubes(Bi NPs@GO-MWCNTs)for the simultaneous detection of multiple heavy metal *** electrodes are prepared on screenprinted electrodes(SPCEs)using an efficient dispensing *** used a SM200 SX-3 A dispenser to load a laborato ry-specific ink with optimized viscosity and adhesion to draw a pattern on the work *** SPCE was used as substrate to facilitate cost-effective and more convenient real-time detection *** techniques,such as cyclic voltammetry and differential pulse voltammetry,were used to demonstrate the sensing capabilities of the proposed sensor,The sensitivity,limit of detection,and linear range of the PANi-Bi NPs@GO-MWCNT electrode are 2.57×10^(2)μA Lμmol^(-1) cm^-2,0.01 nmol/L,and 0.01 nmol/L-5 mmol/L and 0.15×10^(-1)μALμmol^(-1) cm^-2,0.5 nmol/L,and 0.5 nmol/L-5 mmol/L for mercury ion(Hg(Ⅱ))and copper ion(Cu(Ⅱ))detection,*** addition,the electrode exhibits a good selectivity and repeatability for Hg(Ⅱ)and Cu(Ⅱ)sensing when tested in a complex heavy metal ion *** constructed electrode system exhibits a detection performance superior to similar methods and also increases the types of heavy metal ions that can be ***,the proposed device can be used as an efficient sensor for the detection of multiple heavy metal ions in complex environments.

关键词： Bismuth nanoparticle multi-walled carbon nanotube Electrochemical sensor Hg(Ⅱ) Cu(Ⅱ)

The enhanced power factor of multi-walled carbon nanotube/R stabilized polyacrylonitrile composites due to the partially conjugated structure

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Journal of Materiomics 2021年第1期7卷 51-58页

作者： Jiang Li Alayna Brieann Huckleby Mei Zhang High-Performance Materials Institute Florida State UniversityDepartment of Industrial and Manufacturing EngineeringFAMU-FSU College of Engineering2525 Pottsdamer StreetTallahasseeFL32310USA

The studies of organic thermoelectric(TE)materials mainly focus on conductive polymers due to their conjugated molecular structures and high intrinsic electrical *** the conductive polymer is mixed with certain insulating polymers,the power factor was found *** is doubtful that the partially conjugated molecular structure is beneficial to the TE ***(PAN)is an insulating polymer with a non-conjugated structure in its backbone,however,it has a partially conjugated structure after thermal *** this work,a composite of PAN and multi-walled carbon nanotubes(MWCNT)was made and thermally treated in order to study the partially conjugated structure on the improvement of the power *** controlling the PAN content and the temperature of thermal treatments,a maximum power factor of 22 mW/mK2 was obtained from the MWCNT/PAN composite with 45%PAN content after thermally treated at 300℃in air,which is 300%and 80%higher than that without PAN and before thermal treatment,*** is demonstrated that the partially conjugated polymers play an important role in TE performance and they are promising candidates for high-efficient organic TE materials.

关键词： multi-walled carbon nanotube Partially conjugated polymer Organic thermoelectric materials High power factor

Electrocatalytic behaviors of poly acridine orange/multi-walled carbon nanotube modified electrode

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Journal of Chemistry and Chemical Engineering 2008年第6期2卷 44-48页

作者： WANG Zong-hua XIA Yan-zhi TIAN Ling ZHANG Fei-fei Laboratory of Fiber Materials and Modern Textile the Growing Base for State Key Laboratory Qingdao University Qingdao 266071 China

In this work, noncovalent functionalization of multiwalled carbon nanotube （MWNT） with acridine orange （AO） by electropolymerization is studied. The obtained composite film is a viable alternate electrode material, non-toxic, chemical inert, not volatile, using to construct modified electrode. The new type modified electrode has both of unique properties of MWNT and poly acridine orange （POAO）, can provide good sensitivity, low limits of detection, good response precision, and superb response stability.

关键词： multi-walled carbon nanotube acridine orange modified electrode

Adsorption of lead on multi-walled carbon nanotubes with different outer diameters and oxygen contents: Kinetics, isotherms and thermodynamics

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Journal of Environmental Sciences 2013年第1期25卷 195-203页

作者： Fei Yu Yanqing Wu Jie Ma Chi Zhang School of Environmental Science and Engineering Shanghai Jiao Tong University State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji University

The effects of different outer diameters and surface oxygen contents on the adsorption of heavy metals onto six types of multi-walled carbon nanotubes （MWCNTs） were investigated in an aqueous solution and lead was chosen as a model metal ion. The results indicated that the percentage removal and adsorption capacity of lead remarkably increased with decreasing outer diameter due to larger specific surface area （SSA）. The SSA-normalized maximum adsorption capacity （qJSSA） and SSA-normalized adsorption coefficient （KdSSA） were strongly positively correlated with surface oxygen content, implying that lead adsorption onto MWCNTs significantly increases with the rise of oxygen content and decreases with decreasing SSA. The calculated thermodynamic parameters indicated that adsorption of lead on MWCNTs was endothermic and spontaneous. When the oxygen content of MWCNTs increased from 2.0% to 5.9%, the standard free energy （AGt） became more negative, which implied that the oxygenated functional groups increased the adsorption affinity of MWCNTs for lead. Through calculation of enthalpy （△H0）, AGO and free energy of adsorption （Ea）, lead adsorption onto MWCNTs was recognized as a chemisorption process. The chemical interaction between lead and the phenolic groups of MWCNTs could be one of the main adsorption mechanisms due to highly positive correlations between the phenolic groups and Kd/SSA or qm/SSA.

关键词： adsorption lead multi-walled carbon nanotube diameter surface oxygen content

In situ synthesis of palladium nanoparticles on multi-walled carbon nanotubes and their electroactivity for ethanol oxidation

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Rare Metals 2013年第6期32卷 586-591页

作者： Qing-Feng Yi Li-Zhi Sun School of Chemistry and Chemical Engineering Hunan University of Science and Technology

Pd nanoparticles(Pd-NPs)were prepared and directly anchored on the surface of multi-walled carbon nanotubes(MWCNTs)in the absence of chemical reduction agent,where MWCNTs were used as both the chemical reduction agent and the support substrate of *** of various surfactants on the in situ deposition of PdNPs on MWCNTs was *** MWCNTs were modified with a cationic surfactant(hexadecyl trimethyl ammonium bromide,CTAB),the amount of the Pd-NPs(Pd-NP/CTAB-MWCNT)generated by such an in situ deposition method gets a notable increase,and the size of the as-synthesized Pd-NPs becomes smaller,compared with those in the absence of any surfactant(Pd-NP/MWCNT)or in the presence of an anionic surfactant SDS(Pd-NP/SDS-MWCNT)and a neutral surfactant OP(PdNP/OP-MWCNT).Results show that the MWCNTs modified with CTAB are propitious to the in situ reduction of Pd2?.Among the prepared catalysts,Pd-NP/CTABMWCNT displays the highest electroactivity for ethanol oxidation in alkaline media.

关键词： Pd nanoparticle multi-walled carbon nanotube Ethanol oxidation Surfactant

Radial breathing modes of multi-walled carbon nanotubes by an atomic beam-spring model

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Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 940-946页

作者： MIAO ChunYang LI HaiJun GUO WanLin State Key Laboratory of Mechanics and Control of Mechanical Structures and the Key Laboratory of Intelligent Nano Materials and Devices of MOE and Institute of Nano Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China Maintenance Engineering Division Center of Aviation Safety and TechnologyCivil Aviation Administration of ChinaBeijing 100028China

Based on molecular force fields,a new finite element model is constructed for multi-walled carbon nanotubes where the interlayer interactions and C--C bonds are simulated by the elements of piece-wise linear spring and rectangular cross section beam,*** high computation efficiency and atomic reification,the radial breathing modes of multi-walled carbon nanotubes are studied systemically using this *** results show the correspondence between carbon nanotube structures and vibrational modes,which provide unequivocal data for the experimental characterization of carbon *** empirical relationship of radial breathing modes frequencies with the nanotube radius are also obtained for two-layer carbon nanotubes.

关键词： radial breathing modes multi-walled carbon nanotube atomic beam-spring model

Adsorption of toluene, ethylbenzene and xylene isomers on multi-walled carbon nanotubes oxidized by different concentration of NaOCI

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Frontiers of Environmental Science & Engineering 2012年第3期6卷 320-329页

作者： Fei YU Jie MA Yanqing WU School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

multi-walled carbon nanotubes （MWCNTs） were fabricated and oxidized by different concentrations of sodium hypochlorite （NaOC1） solutions. The untreated MWCNTs and modified MWCNTs were employed as adsorbents to study their characterizations and adsorption performance of toluene, ethylbenzene and xylene isomers （TEX） in an aqueous solution. The physicochemical properties of MWCNTs were greatly affected after oxidation, which influences TEX adsorption capacity. The 3% NaOCl-oxidized MWCNTs shows the greatest enhancement in TEX adsorption, followed by the 30% NaOCl. More interestingly, the 15% NaOCl-oxidized MWCNTs has lower adsorption capacities than untreated MWCNTs. The adsorption mechanism of TEX on treated MWCNTs is attributed to the combined action of hydrophobic interaction, π-π bonding interaction between the aromatic ring of TEX and the oxygen-containing functional groups of MWCNTs and electrostatic interac- tion. 3% NaOCl solution could not only introduce much oxygen-containing functional groups on MWCNTs, but also lead to less damage for the pore structure. This suggests that the CNTs-3% NaOCl is efficient adsorbent for TEX and that they may possess good potential for TEX removal in wastewater treatment.

关键词： adsorption toluene ethylbenzene and xylene isomers (TEX) multi-walled carbon nanotube surface oxidation