Using cyclic voltammetry to measure bandgap modulation of functionalized carbon nanotubes

Matthew L. Gross, Michael A. Hickner

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Cyclic voltammograms of gold electrodes laden with carbon nanotubes covalently modified with various electron-withdrawing or donating moieties were measured. Carbon nanotubes modified with electron-donating bromophenyl groups showed a bandgap of 3.0 eV compared to 1.9 eV for unmodified purified tubes. Nitrophenyl substitution, which has a strong electron-withdrawing character yielded tubes with a bulk bandgap of 1.6 V. The bandgaps can be rationalized by considering the reactivity of the diazonium compounds and the relative populations of metallic and semiconducting tubes before and after modification.

Original languageEnglish (US)
Pages (from-to)K5-K7
JournalElectrochemical and Solid-State Letters
Volume13
Issue number2
DOIs
StatePublished - 2010

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Materials Science
  • Electrical and Electronic Engineering
  • Electrochemistry
  • Physical and Theoretical Chemistry

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