Diffusion limited current in very high aspect ratio Pt needle electrodes

Jie Hu; Kyungsuk Yum; Arash Tajik; Majid Minary-Jolandan; Jeahoon Bang; Min Feng Yu

doi:10.1063/1.3621875

Diffusion limited current in very high aspect ratio Pt needle electrodes

Jie Hu, Kyungsuk Yum, Arash Tajik, Majid Minary-Jolandan, Jeahoon Bang, Min Feng Yu

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

5 Scopus citations

Abstract

A direct-write nanofabrication technique was applied to fabricate high aspect ratio Pt needle electrodes for site specific electrochemistry and electrophysiology. Non-passivated and passivated (with a 10 nm thin insulating film) Pt needles having uniform radii as small as 100 nm and lengths over 30 m were deposited on the exposed conductive ends of ultramicroelectrodes to form extended needle electrodes. Diffusion limited current and its dependence on the radius of the Pt needle were measured with linear sweep voltammetry. Model fittings validated the function of such needle electrodes for effective microscale electrochemical studies and potentially electrophysiological applications.

Original language	English (US)
Article number	053113
Journal	Applied Physics Letters
Volume	99
Issue number	5
DOIs	https://doi.org/10.1063/1.3621875
State	Published - Aug 1 2011
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "A direct-write nanofabrication technique was applied to fabricate high aspect ratio Pt needle electrodes for site specific electrochemistry and electrophysiology. Non-passivated and passivated (with a 10 nm thin insulating film) Pt needles having uniform radii as small as 100 nm and lengths over 30 m were deposited on the exposed conductive ends of ultramicroelectrodes to form extended needle electrodes. Diffusion limited current and its dependence on the radius of the Pt needle were measured with linear sweep voltammetry. Model fittings validated the function of such needle electrodes for effective microscale electrochemical studies and potentially electrophysiological applications.",

author = "Jie Hu and Kyungsuk Yum and Arash Tajik and Majid Minary-Jolandan and Jeahoon Bang and Yu, {Min Feng}",

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T1 - Diffusion limited current in very high aspect ratio Pt needle electrodes

AU - Hu, Jie

AU - Yum, Kyungsuk

AU - Tajik, Arash

AU - Minary-Jolandan, Majid

AU - Bang, Jeahoon

AU - Yu, Min Feng

N1 - Funding Information: The work is supported by the NSF Grant Nos. CBET-0731096 and CBET-0933223.

PY - 2011/8/1

Y1 - 2011/8/1

N2 - A direct-write nanofabrication technique was applied to fabricate high aspect ratio Pt needle electrodes for site specific electrochemistry and electrophysiology. Non-passivated and passivated (with a 10 nm thin insulating film) Pt needles having uniform radii as small as 100 nm and lengths over 30 m were deposited on the exposed conductive ends of ultramicroelectrodes to form extended needle electrodes. Diffusion limited current and its dependence on the radius of the Pt needle were measured with linear sweep voltammetry. Model fittings validated the function of such needle electrodes for effective microscale electrochemical studies and potentially electrophysiological applications.

AB - A direct-write nanofabrication technique was applied to fabricate high aspect ratio Pt needle electrodes for site specific electrochemistry and electrophysiology. Non-passivated and passivated (with a 10 nm thin insulating film) Pt needles having uniform radii as small as 100 nm and lengths over 30 m were deposited on the exposed conductive ends of ultramicroelectrodes to form extended needle electrodes. Diffusion limited current and its dependence on the radius of the Pt needle were measured with linear sweep voltammetry. Model fittings validated the function of such needle electrodes for effective microscale electrochemical studies and potentially electrophysiological applications.

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Diffusion limited current in very high aspect ratio Pt needle electrodes

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