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Removal of shells of multi-wall carbon nanotubes by repeatedly scanning bias voltage

Science China(Technological Sciences) 2004年第1期47卷 1-5页

作者： LI Qiuhong WANG Taihong Institute of Physics Chinese Academy of Sciences Beijing 100080 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China

Carbon nanotubes can either be metallic or semiconducting, depending on their chirality. IBM converted multi-wall nanotubes into either a metallic or a semiconducting conductor by selectively removing the shells of the MWNTs. This was realized by applying a constant voltage to the tubes in air. Here we report a new method to remove the shells of a single MWNT just by repeatedly scanning the bias voltage in vacuum. Both the direct contact of the outmost shell with the electrodes and the high anisotropy of thermal conductivity help to remove the shells one by one. Keywords multi-wall carbon nanotube - Joule heating - thermal conductivity - breakdown

关键词： multi-wall carbon nanotube, Joule heating, thermal conductivity, breakdown.

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Adsorption and adhesion of blood proteins and fibroblasts on multi-wall carbon nanotubes

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Science China(Life Sciences) 2009年第5期52卷 479-482页

作者： LI DeJun1, YUAN Li1, YANG Ying1, DENG XiangYun1, Lü XiaoYing2, HUANG Yan2, CAO Zheng2, LIU Hao3 & SUN XueLiang3 1 College of Physics and Electronic Information Science, Tianjin Normal University, Tianjin 300074, China 2 State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China 3 Department of Mechanical & Materials Engineering, University of Western Ontario, London, ON, Canada College of Physics and Electronic Information Science Tianjin Normal University Tianjin China State Key Laboratory of Bioelectronics Southeast University Nanjing China Department of Mechanical & Materials Engineering University of Western Ontario London Canada

This article concerns the investigation of blood protein adsorption on carbon paper and multi-wall carbon nanotubes (MWCNTs). Mouse fibroblast cell adhesion and growth on MWCNTs was also studied. The results showed that fibrinogen adsorption on carbon paper was much lower than that on MWCNTs, which means that platelets readily aggregate on the surface of MWCNTs. Mouse fibroblast cells implanted on MWCNTs tended to grow more prolifically than those implanted on carbon paper. The cell concentration observed on MWCNTs increased from 1.2×105/mL for a single day culture to 2×105/mL for a 7-day culture. No toxicity reaction was observed during the culturing period. These results indicated that MWCNTs possessed excellent tissue compatibility.

关键词： multi-wall carbon nanotubes cell adhesion protein adsorption toxicity tissue compatibility

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Properties and Structural Studies of multi-wall Carbon Nanotubes-Phosphate Ester Hybrids

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International Journal of Organic Chemistry 2013年第1期3卷 26-34页

作者： Marina Massaro Serena Riela Giuseppe Cavallaro Maria Luisa Saladino Simonpietro Agnello Renato Noto Dipartimento di Chimica e Fisica Università degli Studi di Palermo Palermo Italy Dipartimento STEBICEF Sezione di Chimica Università degli Studi di Palermo Palermo Italy

Long chain phosphate esters bearing at least one or two aryl groups have been synthesized and used for the preparation of stable multi-walled carbon nanotube (MWCNT) hybrids. The non-covalent interaction ester/MWCNT has been investigated by several techniques (SEM, UV-vis, 31P-NMR, RAMAN). The used phosphate ester derivatives demonstrated the ability to produce an excellent dispersion of MWCNT in CHCl3. The obtained dispersions showed a great stability from one to at least three weeks in the range of concentration considered. Thermal analysis showed an increase in the decomposition temperature for the hybrids with respect to pristine MWCNT.

关键词： multi-wall Carbon Nanotubes Hybrids Non Covalent Functionalization Phosphate Esters

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Temperature Dependent Surface Resistivity Measures of Commercial, multiwall Carbon Nanotubes (MWCNT), and Silver Nano-Particle Doped Polyvinyl Alcohol (PVA) Films

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Materials Sciences and Applications 2014年第13期5卷 915-922页

作者： Matthew Edwards Stephen Egarievwe Afef Janen Tatiana Kukhtarev Jemilia Polius John Corda Department of Physics Chemistry & Mathematics Alabama A & M University Normal Al USA Department of Engineering Construction Management & Industrial Technology Alabama A & M University Normal Al USA

Pure and doped Polyvinylidene difluoride (PVDF) films, for the detection of infrared radiation, have been well documented using the mechanism of pyroelectricity. Alternatively, the electrical properties of films made from Polyvinyl Alcohol (PVA) have received considerable attention in recent years. The investigation of surface resistivities of both such films, to this point, has received far less consideration in comparison to pyroelectric effects. In this research, we report temperature dependent surface resistivity measurements of commercial, and of multiwall carbon nanotubes (MWCNT), or Ag-nanoparticle doped PVA films. Without any variation in the temperature range from 22°C to 40°C with controlled humidity, we found that the surface resistivity decreases initially, reaches a minimum, but rises steadily as the temperature continues to increase. This research was conducted with the combined instrumentation of the Keithley Model 6517 Electrometer and Keithley Model 8009 resistivity test fixture using both commercial and in-house produced organic thin films. With the objective to quantify the suitability of PVDF and PVA films as IR detector materials, when using the surface resistivity phenomenon, instead of or in addition to the pyroelectricity, surface resistivity measurements are reported when considering bolometry. We found that the surface resistivity measurements on PVA films were readily implemented.

关键词： Silver Nano-Particles Surface Resistivity multi-wall Carbon Nanotubes (MWCNT) Polyvinyl Alcohol (PVA) Films

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