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Research

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Publication details for Professor Michael Petty

Lee, KU, Petty, MC, Kim, DJ & Ahn, BT (2007). Effect of sodium bromide salt on the buildup of consecutive MWCNTs film by electrostatic self-assembly. Journal Of The Electrochemical Society 154(9): K68-K73.
  • Publication type: Journal Article
  • ISSN/ISBN: 0013-4651

Author(s) from Durham

Abstract

Purified multiwalled carbon nanotubes (MWCNTs) were dispersed in poly
sodium 4-styrenesulfonate (PSS) and polydiallyldimethylammonium (PDDA),
respectively, solutions, where some of them were adsorbed on a CNT
wall, providing a positive or negative charge on the CNT wall. The
presence of surface charges on the CNTs then allowed a consecutive
deposition of CNT via the electrostatic layer-by-layer method. The
flexibility of the polyelectrolyte chain is one of the key parameters
used for determining the ability of the chain to wrap around the
nanotubes and thus affects the deposition morphology. This was
controlled by changing the NaBr concentration. Analyses using UV-
visible spectroscopy, ellipsometry, and scanning electron microscopy
showed that the deposition rate of CNT-PSS increased as the NaBr
concentration increased. The deposition rate of CNT-PDDA initially
decreased as the NaBr concentration increased and it increased with
further increasing NaBr concentration. The interaction between the CNT
and PSS increased as the salt concentration increased from X-ray
photoelectron spectroscopy analysis. However, the effect of NaBr on the
interaction between CNT and PDDA was different from that of CNT-PSS.
The unsaturated impurity peak of PDDA at 291 eV disappeared when the
NaBr concentration was low and it appeared again as the NaBr
concentration increased further. (c) 2007 The Electrochemical Society.