One-step coating of silica onto multi-walled carbon nanotubes using polyethyleneimine for high electrical resistivity

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• 作者：Kyunghee Kim ; Jeonghoon Nam ; Sung-Hyeon Baeck ; Kangseok Lee…
• 关键词：multi ; walled carbon nanotubes (MWCNTs) ; silica ; sol ; gel ; coating ; polyethyleneimine
• 刊名：Macromolecular Research
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：23
• 期：5
• 页码：422-427
• 全文大小：882 KB
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• 作者单位：Kyunghee Kim (1)
  Jeonghoon Nam (1)
  Sung-Hyeon Baeck (1)
  Kangseok Lee (2)
  Soo-Jin Park (1)
  Sang Eun Shim (1)
  
  1. Department of Chemistry & Chemical Engineering, Inha University, 253 Yonghyundong, Namgu, Incheon, 402-751, Korea
  2. Neo Chems Co., Ltd., 64 Chorok-ro, 693beon-gil, Yanggam-myeon, Hwaseong-si, Gyeonggi, 445-933, Korea
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Polymer Sciences
  Characterization and Evaluation of Materials
  Soft and Granular Matter, Complex Fluids and Microfluidics
  Nanochemistry
  Nanotec
  
• 出版者：The Polymer Society of Korea, co-published with Springer
• ISSN：2092-7673

文摘

Multi-walled carbon nanotubes (MWCNTs) were uniformly coated with silica using polyethyleneimine (PEI) as a coupling agent without subjecting the surfaces of the MWCNTs to chemical modification, such as an amine treatment or chemical oxidation. PEI was physically adsorbed onto the MWCNTs, and the silica coating process was performed through a sol-gel reaction of tetraethyl orthosilicate (TEOS) in ethanol under base catalytic conditions at room temperature. PEI was the best coupling agent for coating silica on MWCNTs among the various amphiphilic polymers and surfactant tested, which included Triton X-100, polyvinylpyrrolidone, polyethylene glycol, and sodium dodecyl sulfate. During the sol-gel process using PEI as a coupling agent, silica could be uniformly formed on MWCNTs without any structural defects. As the amount of TEOS used was increased, the thickness of coated silica layer and electrical resistivity of MWCNTs also increased (up to 5.3×1010 Ω sq?) owing to the high surface coverage of silica on the MWCNTs.