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Bao Chun LIU Qi LIANG Shui Hua TANG Li Zhen GAO Bo Lan ZHANG Mei Zhen QU Zuo Long YU 《中国化学快报》2000,11(11)
A great amount of research on carbon nanotubes (CNTs) has been carried out since its observation in 19911. It has been predicted that CNTs can be novel materials of semiconductor, electric-field-induced electron emitters, quantum wire, catalysts etc2-5. Nowadays, CNTs can be synthesized by arc discharge6 laser ablation7, and pyrolysis of hydrocarbon gases8. In order to make CNTs of practical importance, the criteria for assessing any synthesis technique must include the feasibility and po… 相似文献
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Bao‐Chun Liu Shui‐Hua Tang Qi Liang Li‐Zhen Gao Bo‐Lan Zhang Mei‐Zhen Qu Zuo‐Long Yu 《中国化学》2001,19(10):983-986
A technique has been developed to grow carbon nanotubes by flowing acetylene over pre‐reduced LaCoO3 catalyst in a fluidized‐bed catalytic reactor. Carbon nanotubes were characterized by means of SEM and TEM. The pre‐reduced LaCoO3 catalyst was found to be effective in producing carbon nanotubes with even diameter. The effects of reduction temperature of LaCoO3 on the growth of carbon nanotubes were investigated. This process can easily be scaled up. 相似文献
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碳纳米管的纯化──电化学氧化法 总被引:13,自引:0,他引:13
用电化学氧化法对碳纳米管进行纯化,从稳态极化曲线出发,对反应的可行性进行了分析,考察了支持电解质、电流密度、时间等因素对反应的影响,确定了最佳实验条件,同时对纯化机理进行了解释. 相似文献
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XiChengMA NingLUN ShuLinWEN 《中国化学快报》2005,16(2):265-268
Carbon nanotubes were initially chemically modified with an H2SO4-HNO3 treatment, and subsequently activated with Pd-Sn catalytic nuclei via a one-step activation approach. These activated nanotubes were used as precursors for obtaining gold nanoparticles-attached nanotubes via simple electroless plating. This approach provides an efficient method for attachment of metal nanostructures to carbon nanotubes. Such novel hybrid nanostructures are attractive for many applications. 相似文献
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XuChunSONG ZhuDeXU YiFanZHENG GuiHAN WeiXiangCHEN 《中国化学快报》2004,15(5):623-626
Single and double layered MoS2-coated multiwalled carbon nanotubes (MWCNs) were successfully prepared by pyrolyzing (NH4)2MoS4-coated multiwalled carbon nanotubes in an H2 atmosphere at 900℃. MoS2-coated MWCNs would be expected to have different tribological and mechanical properties compared to MoS2, so it may have potential applications in many fields. 相似文献
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苯在固定电化学反应氧制备对苯二醌,阳极和阴极分别为多孔铅合金和铅粒。是解液是1mol/l硫酸水溶液,苯分散于电解液中。最佳电解条件:电解液流速u=0.19m.s^-1,反应器厚度L=10mm,电极电位E=1.6V,电流I=10A和苯含量CB=24%,电流效率CE是62.9%。 相似文献
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Electrochemical Sensing of Uric Acid Using Glassy Carbon Modified with Multiwall Carbon Nanotubes Dispersed in Polyethylenimine 下载免费PDF全文
Alejandro Gutiérrez Maria L. Lozano Laura Galicia Nancy F. Ferreyra Gustavo A. Rivas 《Electroanalysis》2014,26(10):2191-2196
This work reports the advantages of using glassy carbon electrodes modified with multiwall carbon nanotubes (MWCNT) dispersed in polyethylenimine (PEI). The presence of MWCNTs wrapped by PEI largely facilitated the strong adsorption of uric acid (UA) and allowed its highly sensitive and selective quantification even in the presence of high excess of ascorbic acid. The selected conditions for the electrochemical sensing were 5 s accumulation at ?0.300 V under stirring and quantification in a 0.050 M phosphate buffer solution pH 7.40 by differential pulse voltammetry adsorptive‐stripping after medium exchange. The platform allowed the successful application in the quantification of UA in urine. 相似文献
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Izaskun Bustero García Ainara Obieta Isabel Muñoz Roberto Rincón Inés Arteche Amaya 《Mikrochimica acta》2006,152(3-4):239-247
Interest in carbon nanotubes (CNT) has grown at a very rapid rate in the last decade. Their interesting physical and chemical
properties open attractive possibilities in many application areas. These properties depend on the process conditions during
synthesis and on subsequent purification steps. Recent studies have demonstrated that CNT can promote the electron transfer
of biomolecules. These exceptional properties make them attractive for use in electrochemical biosensors.
Multi walled nanotubes have been synthesized by the Chemical Vapor Deposition (CVD) method using methane as a carbon source
and Ni–Al2O3–SiO2 as the catalyst. The influence of the variation of certain reaction parameters such as feed gas composition, catalyst mass,
temperature and reaction time in the yield of the CVD process has been established. In addition, the structural and chemical
characteristics of the CNTs have been studied and a purification process to eliminate the catalyst and amorphous carbon has
been developed that involves a gaseous oxidative process and acid treatment. The efficiency of the purification step has been
determined by analytical techniques.
Atomic force microscopy, Raman scattering, thermogravimetric analysis, inductively coupled plasma atomic spectroscopy are
the characterization techniques employed in this work. 相似文献
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Wei Xiang CHEN* Zhu De XU Jiang Ping TU Zhong Jian LIU Ya Xu JIN De Yi LV Xiao Nan LU Department of Chemistry Department of Materials Science Engineering Department of Physics Zhejiang University Hangzhou 《中国化学快报》2001,(6)
Carbon nanotubes, which was discovered by Iijima1 in 1991, is the most typical one-dimensional nano-material with the micrometers order in length and nanometers order in diameter. CNTs are composed of graphitic sheets rolled into closed concentric cylinders, and classed into single wall nanotubes and multi-wall nanotubes. CNTs can offer many significant advantages over most existing materials. Since its discovery, unprecedented interest has been stimulated because of its significance both in… 相似文献
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Antonella Curulli Stella Nunziante Cesaro Adriana Coppe Claudia Silvestri Giuseppe Palleschi 《Mikrochimica acta》2006,152(3-4):225-232
Single-Walled Carbon Nanotubes (SWCNTs) possess a wealth of exceptional structural, mechanical and electronic properties.
These have made them potentially useful for applications in nanotube-reinforced materials, nanoelectronic devices, field emitters,
probe tips for SPM, as well as for sensors, biosensors, and actuators.
However, manipulation and processing of SWCNTs has been limited by their insolubility in most common solvents, although some
dissolution has recently been obtained. Their chemical modification might pave the way to many useful applications, including
the preparation of composite materials or the immobilization of biological molecules as enzymes (i.e., for biosensors and
electrochemical sensors). Attachment of oxygen-containing functional groups (i.e., carboxy groups, carbonyl groups, hydroxy
groups, etc.) on the surface of the carbon nanotubes could be achieved using different pretreatments of the nanostructured
material. These involved (a) chemical and physical procedures; and (b) electrochemical functionalization. Different attempts
at sidewall modification have been hampered by the presence of significant contaminants as graphitic and amorphous carbon
or have required solubilization via chemical reactions on the ends of cut nanotubes. A more accommodating and direct approach
to functionalize nanotubes is therefore required.
We report here the sidewall functionalization of purified SWCNTs, obtained by different approaches and finally, we can discuss
possible applications of functionalized SWCNTs in the sensing area. 相似文献