In situ optical spectroelectrochemistry of single-walled carbon nanotube thin films |
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Authors: | Markéta Zukalová Ján Tarábek Martin Kalbáč Ladislav Kavan Lothar Dunsch |
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Institution: | (1) J. Heyrovsky Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague 8, Czech Republic;(2) Group of Electrochemistry and Conducting Polymers, Leibniz Institute of Solid State and Materials Research, Helmholtzstr. 20, 01069 Dresden, Germany |
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Abstract: | A detailed study is presented on the optical absorption of thin films of single-walled carbon nanotubes (SWNT) under electrochemical
conditions. The procedure for the preparation of free-standing 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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Keywords: | UV-Vis spectroelectrochemistry Cyclic voltammetry Single-walled carbon nanotubes Thin films Doping |
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