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

Yumin Lee, Minkyung Kang, Jun Ho Shim, Nam Suk Lee, Jeong Min Baik, Youngmi Lee, Chongmok Lee, Myung Hwa Kim

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


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.

Original languageEnglish
Pages (from-to)18550-18556
Number of pages7
JournalJournal of Physical Chemistry C
Issue number34
StatePublished - 30 Aug 2012


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