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Baik, Jeong Min
Nano Energy and Environmental Materials Lab
Research Interests
  • Nanogenerators, antimicrobial material, catalysis, smart sensors

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

Cited 3 times inthomson ciCited 4 times inthomson ci
Title
Growth of highly single crystalline IrO 2 nanowires and their electrochemical applications
Author
Lee, YuminKang, MinkyungShim, Jun HoLee, Nam-SukBaik, Jeong MinLee, YoungmiLee, ChongmokKim, Myung Hwa
Keywords
Calibration curves; Electrochemical applications; Electron transfer kinetics; Iridium dioxide; Microwire; Nanowire surface; Needle-like; PH response; Single-crystalline; Surface layers; Vapor phase transport process
Issue Date
201208
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.116, no.34, pp.18550 - 18556
Abstract
We present the facile growth of highly single crystalline iridium dioxide (IrO2) nanowires on SiO2/Si and Au substrates via a simple vapor phase transport process under atmospheric pressure without any catalyst. Particularly, high-density needle-like IrO2 nanowires were readily obtained on a single Au microwire, suggesting that the melted surface layer of Au might effectively enhance the nucleation of gaseous IrO3 precursors at the growth temperature. In addition, all the electrochemical observations of the directly grown IrO2 nanowires on a single Au microwire support favorable electron-transfer kinetics of [Fe(CN6)](4-/3-) as well as Ru(NH3)(6)(3+/2+) at the highly oriented crystalline IrO2 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).
URI
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DOI
http://dx.doi.org/10.1021/jp306900m
ISSN
1932-7447
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