Visualization of single-wall carbon nanotube (SWNT) networks in conductive polystyrene nanocomposites by charge contrast imaging

Joachim Loos, Alexander Alexeev, Nadia Grossiord, Cor E. Koning, Oren Regev

Research output: Contribution to journalArticle

138 Citations (Scopus)

Abstract

The morphology of conductive nanocomposites consisting of low concentration of single-wall carbon nanotubes (SWNT) and polystyrene (PS) has been studied using atomic force microscopy (AFM), transmission electron microscopy (TEM) and, in particular, scanning electron microscopy (SEM). Application of charge contrast imaging in SEM allows visualization of the overall SWNT dispersion within the polymer matrix as well as the identification of individual or bundled SWNTs at high resolution. The contrast mechanism involved will be discussed. In conductive nanocomposites the SWNTs are homogeneously dispersed within the polymer matrix and form a network. Beside fairly straight SWNTs, strongly bended SWNTs have been observed. However, for samples with SWNT concentrations below the percolation threshold, the common overall charging behavior of an insulating material is observed preventing the detailed morphological investigation of the sample.

Original languageEnglish
Pages (from-to)160-167
Number of pages8
JournalUltramicroscopy
Volume104
Issue number2
DOIs
Publication statusPublished - Sep 1 2005

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Keywords

  • Charge contrast imaging
  • Conductive nanocomposites
  • Scanning electron microscopy (SEM)
  • Single-wall carbon nanotubes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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