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Growth of highly single crystalline IrO 2 nanowires and their electrochemical applications

Title
Growth of highly single crystalline IrO 2 nanowires and their electrochemical applications
Authors
Lee Y.Kang M.Shim J.H.Lee N.-S.Baik J.M.Lee C.Kim M.H.
Ewha Authors
이종목이영미김명화
SCOPUS Author ID
이종목scopus; 이영미scopus; 김명화scopus
Issue Date
2012
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 116, no. 34, pp. 18550 - 18556
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We present the facile growth of highly single crystalline iridium dioxide (IrO 2) nanowires on SiO 2/Si and Au substrates via a simple vapor phase transport process under atmospheric pressure without any catalyst. Particularly, high-density needle-like IrO 2 nanowires were readily obtained on a single Au microwire, suggesting that the melted surface layer of Au might effectively enhance the nucleation of gaseous IrO 3 precursors at the growth temperature. In addition, all the electrochemical observations of the directly grown IrO 2 nanowires on a single Au microwire support favorable electron-transfer kinetics of [Fe(CN 6)] 4-/3- as well as Ru(NH 3) 6 3+/2+ at the highly oriented crystalline IrO 2 nanowire surface. Furthermore, stable pH response is shown, revealing potential for use as a miniaturized pH sensor, confirmed by the calibration curve exhibiting super-Nernstian behavior with a slope of 71.6 mV pH -1. © 2012 American Chemical Society.
DOI
10.1021/jp306900m
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자연과학대학 > 화학·나노과학전공 > Journal papers
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