Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 18, Pages 4408-4415Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.03.017
Keywords
Electrochemical quartz crystal microbalance (EQCM); Electrochromism; Optical contrast; Polyaniline; Polyanilne/silica composite film; Silica
Categories
Funding
- Strategic External Research, Applied Materials, Inc., Santa Clara, CA, USA, National Taiwan University
- National Science Council (NSC) of Taiwan
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A polyaniline (PANI)/silica (SiO2) composite film was prepared by a simple in situ electrodeposition method, and its electrochromic (EC) properties were studied. When PANI was electrodeposited in the presence of SiO2 particles, the resulting PANI/SiO2 composite films possessed higher surface areas, larger redox charge capacities, and higher doping levels, thus enhanced optical contrasts. By incorporating SiO2 particles into the PANI film, the transmittance change at 700 nm from 10.7% to 16.4%, or an enhancement of ca. 50%, was achieved when operating between -0.5 V and 0 V. In addition, x-ray photoelectron spectroscopy (XPS) indicated that the formation of the highly oxidized PANI might have been retarded through the addition of SiO2 particles. Furthermore, the growth mechanism of the PANI/SiO2 composite film was proposed. (C) 2009 Elsevier Ltd. All rights reserved.
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