Conversion of semiconducting behavior of carbon nanotubes using ball milling

Peng Cheng Ma, Ben Zhong Tang, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


This Letter proposes a novel chemo-mechanical method to in situ functionalize carbon nanotubes (CNTs). Ball milling in the presence of ammonium bicarbonate allowed the introduction of amine and amide groups onto the surface of CNTs, resulting in the conversion of the semiconducting behavior of CNTs from p-type to n-type. The corresponding electrical conductivity of CNT increased gradually with ball milling time, presenting a remarkable 250% increase after 9 h of milling. These interesting observations are attributed to the nitrogen compounds introduced on CNTs, which function as the electron donor in the material.

Original languageBritish English
Pages (from-to)166-169
Number of pages4
JournalChemical Physics Letters
Issue number1-3
StatePublished - 2008


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