Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (3): 469.

• Articles • Previous Articles     Next Articles

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

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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