ORBi: Bocharova Vera - Ultrathin transparent conductive films of polymer-modified multiwalled carbon nanotubes

Reference : Ultrathin transparent conductive films of polymer-modified multiwalled carbon nanotubes


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/5252

Title :	Ultrathin transparent conductive films of polymer-modified multiwalled carbon nanotubes
Language :	English
Author, co-author :	Bocharova, Vera [Leibniz-Institut für Polymerforschung Dresden, Dresden, Germany > > > >]
	Kiriy, Anton [Leibniz-Institut für Polymerforschung Dresden, Dresden, Germany > > > >]
	Oertel, Ulrich [Leibniz-Institut für Polymerforschung Dresden, Dresden, Germany > > > >]
	Stamm, Manfred [Leibniz-Institut für Polymerforschung Dresden, Dresden, Germany > > > >]
	Stoffelbach, François [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Jérôme, Robert [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Detrembleur, Christophe [University of Liège (ULg) > Departemnent of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Publication date :	3-Aug-2006
Journal title :	Journal of Physical Chemistry B
Publisher :	Amer Chemical Soc
Volume :	110
Issue/season :	30
Pages :	14640-14644
Audience :	International
ISSN :	1520-6106
City :	Washington
Keywords :	[en] carbon nanotube
Abstract :	[en] Deposition of multiwalled carbon nanotubes modified by poly(2-vinylpyridine) (CNT-g-P2VP) from aqueous dispersions at low pH is an effective method to prepare homogeneous ultrathin films with a tunable CNTs density. A percolation threshold of 0.25 mu g/cm(2) and a critical exponent alpha = 1.24 have been found from dc conductivity measurements. The sheet resistance value agrees with the percolation theory for 2D films. According to AFM and electrical measurements, even when only 5% of the surface is covered by CNT-g-P2VPs, the sheet resistance is of the order of 1 M Omega/sq, which indicates that conductivity is imparted by a network of an ultralow density. When the film transmittance decreases down to similar to 70% at 550 nm, the occupied surface area is similar to 15% and sheet resistance falls down to similar to 90 k Omega/sq. These data show that undesired in-plane clustering does not occur upon the dispersion casting of the films and that high-quality networks of CNT-g-P2VPs are built up. The electrosteric stabilization of the CNT-g-P2VP dispersions in water at low pH is at the origin of this desired behavior. Although the multiwalled CNT films prepared in this work are less conductive and less transparent than the SWNTs films, they could find applications, e. g., in touch screens, reflective displays, EMI shielding, and static charge dissipation.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	The European Scientific Foundation (ESF), the Deutsche Forschungsgemeinschaft (DFG), and the Belgian “Fonds National de la Recherche Scientifique” (FNRS) within the ESF EUROCORES/SONS program (02-PE-SONS-092-NEDSPE) ; The “Région Wallonne” in the frame of the “Nanotechnologies” program ENABLE ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/5252
DOI :	10.1021/jp062458e
Other URL :	http://pubs.acs.org/doi/pdf/10.1021/jp062458e

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