In-situ amino functionalization of carbon nanotubes using ball milling.
A simple chemo-mechanical method is proposed for in-situ amino functionalization of carbon nanotubes (CNTs). Ball milling in the presence of ammonium bicarbonate (NH4HCO3) allowed introduction of functional groups like amine, amide on the surface of CNTs. The milled CNTs were characterized extensively using a particle size analyzer, a transmission electronic microscope, Raman spectrometry, X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry and surface area measurement to evaluate the influences of ball milling conditions. The results show that CNTs milled with NH4HCO3 were more effectively disentangled and shortened than those without the chemical. The amino termination of the functionalized CNTs makes it possible to covalently bond to polymers and biological systems, as well as the potential applications in electronics industry.
Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Peng Cheng
PC
Ma
Sheng Qi
SQ
Wang
Jang-Kyo
JK
Kim
Ben Zhong
BZ
Tang