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

doi:10.1021/jp306900m

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

Department of Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Pages (from-to)	18550-18556
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	34
DOIs	https://doi.org/10.1021/jp306900m
State	Published - 30 Aug 2012

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10.1021/jp306900m

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@article{c071868fd1d943eb84eb22f27c0fca42,

title = "Growth of highly single crystalline IrO 2 nanowires and their electrochemical applications",

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.",

author = "Yumin Lee and Minkyung Kang and Shim, {Jun Ho} and Lee, {Nam Suk} and Baik, {Jeong Min} and Youngmi Lee and Chongmok Lee and Kim, {Myung Hwa}",

year = "2012",

month = aug,

day = "30",

doi = "10.1021/jp306900m",

language = "English",

volume = "116",

pages = "18550--18556",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Growth of highly single crystalline IrO 2 nanowires and their electrochemical applications

AU - Lee, Yumin

AU - Kang, Minkyung

AU - Shim, Jun Ho

AU - Lee, Nam Suk

AU - Baik, Jeong Min

AU - Lee, Youngmi

AU - Lee, Chongmok

AU - Kim, Myung Hwa

PY - 2012/8/30

Y1 - 2012/8/30

N2 - 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.

AB - 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.

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DO - 10.1021/jp306900m

M3 - Article

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SN - 1932-7447

VL - 116

SP - 18550

EP - 18556

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 34

ER -

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

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