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Title of Journal: J Solid State Electrochem

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Abbravation: Journal of Solid State Electrochemistry

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Springer-Verlag

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1433-0768

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In situ optical spectroelectrochemistry of single

Authors: Markéta Zukalová Ján Tarábek Martin Kalbáč Ladislav Kavan Lothar Dunsch
Publish Date: 2008/01/31
Volume: 12, Issue: 10, Pages: 1279-1284
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Abstract

A detailed study is presented on the optical absorption of thin films of singlewalled carbon nanotubes SWNT under electrochemical conditions The procedure for the preparation of freestanding semitransparent films of SWNT is used for the fabrication of a working electrode for transmission optical spectroelectrochemistry The analysis of the potential dependent spectroscopic response of the SWNT film benefits from the widest possible electrochemical window in which the charging of SWNT can safely be investigated This electrochemical window is not limited by parasitic electrochemistry and/or galvanic breakdown reactions occurring at supporting electrode materials such as indium–tin oxide conducting glass or semitransparent Pt film which were employed in earlier studies Electrochemical doping of SWNT is observable at the optical absorptions which are assigned to allowed electronic transitions between van Hove singularities in the density of states of SWNT Furthermore the spectral response of counterions balancing the charging of the nanotube skeleton is traceable at certain conditions The latter effect is monitored here through the overtones of C–H stretching vibrations from tetrabutylammonium cations

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