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

^*Corresponding author for this work

University of Illinois at Urbana-Champaign

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

5 Citations (Scopus)

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
Article number	053113
Journal	Applied Physics Letters
Volume	99
Issue number	5
DOIs	https://doi.org/10.1063/1.3621875
Publication status	Published - 1 Aug 2011
Externally published	Yes

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Hu, J., Yum, K., Tajik, A., Minary-Jolandan, M., Bang, J., & Yu, M. F. (2011). Diffusion limited current in very high aspect ratio Pt needle electrodes. Applied Physics Letters, 99(5), Article 053113. https://doi.org/10.1063/1.3621875

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AU - Hu, Jie

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AU - Bang, Jeahoon

AU - Yu, Min Feng

PY - 2011/8/1

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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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