iRUNC Advantages and Real Geometrical Dimensions of Microband Electrodes

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• 作者：Ze'ev Porat ; Joseph C. Crooker ; Yining Zhang ; Y. Le Mest ; and Royce W. Murray
• 刊名：Analytical Chemistry
• 出版年：1997
• 出版时间：December 15, 1997
• 年：1997
• 卷：69
• 期：24
• 页码：5073 - 5081
• 全文大小：266K
• 年卷期：v.69,no.24(December 15, 1997)
• ISSN：1520-6882

文摘

Microband electrodes have two important advantagesrelative to microdisks: (a) larger and thus more easilymeasured currents and (b) smaller ohmic drop(iR_UNC).Measurements of electrode kinetics and of transportunder linear diffusion conditions at microband electrodesrequire knowledge of their actual areas. This paperdescribes the use of microbands, fabricated by sandwiching a thin metal film between insulators (sandwich electrode) and by lithographic deposition of a thin metal stripon an insulating substrate (line electrode), under radialand linear diffusion conditions, achieved using respectively fluid and highly viscous solutions. Whencomparedunder linear diffusion conditions to microdisk and lineelectrodes, most sandwich microband electrodes haveactual areas that are larger than their planned,geometricalareas. The difference is not revealed under radialdiffusion conditions. This paper also describes lineardiffusionexperiments which test the theory that predicts smalleriR_UNC effects at microbands relative to those atmicrodisks.