高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (3): 469.

• 研究快报 • 上一篇    下一篇

针尖化学方法研究单壁碳纳米管末端羧基的解离性质

杨延莲, 张锦, 南小林, 刘忠范   

  1. 北京大学化学与分子工程学院, 纳米科学与技术研究中心, 北京 100871
  • 收稿日期:2001-09-11 出版日期:2002-03-24 发布日期:2002-03-24
  • 通讯作者: 刘忠范(1962年出生),男,博士,教授,博士生导师,长江特聘教授,主要从事纳米化学研究.E-mail:lzf@chem.pku.edu.cn E-mail:lzf@chem.pku.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:6989002;29803002;29973001和30000044);国家教育部博士学科点基金(批准号:97000116)资助

Studies on the Dissociation Behavior of Carboxylic Groups at the Open End of Single-Walled Carbon Nanotubes by Tip Chemistry

YANG Yan-Lian, ZHANG Jin, NAN Xiao-Lin, LIU Zhong-Fan   

  1. College of Chemistry & Molecular Engineering, Center for Nanoscale Science and Technology, Peking University, Beijing 100871, China
  • Received:2001-09-11 Online:2002-03-24 Published:2002-03-24

关键词: 针尖化学, 力滴定, 单壁碳纳米管, 表面缩合, 粘滞力

Abstract: We have demonstrated here the dissociation behavior of carboxylic groups at the open end of Single-Walled Carbon Nanotubes(SWNTs) by tip chemistry. SWNTs were cut into short pipes by acid oxidation and thus carboxylic groups were produced at the end of the tubes. The SWNTs can be immobilized onto AFMtips by surface condensation between aminoterminated self-assembled monolayers(SAMs) on AFM tips and carboxylic groups at the end of SWNTs. The pK1/2 value of the SWNTs was then obtained from the force titration measurements of the SWNTs tips vs. hydroxylterminated SAMs. The results showed a different force titration behaviour and variable pK1/2 values among different SWNTs tips, indicating the variations in the chemistry from tube to tube.

Key words: Tip chemistry, Force titration, Single-walled carbon nanotubes, Surface condensation, Adhesion force

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