VOLTAMMETRY AT LINEAR GOLD AND PLATINUM MICROELECTRODE ARRAYS PRODUCED BY LITHOGRAPHIC TECHNIQUES
VOLTAMMETRY AT LINEAR GOLD AND PLATINUM MICROELECTRODE ARRAYS PRODUCED BY LITHOGRAPHIC TECHNIQUES
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DOI：
10.1021/ac00291a007
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发表时间：
1985-01-01
影响因子：
7.4
通讯作者：
BOND, AM
中科院分区：
文献类型：
--
作者：
THORMANN, W;VANDENBOSCH, P;BOND, AM
用光刻技术制作了金、铂线性伏安微电极阵列。这种技术使大的通用性，以获得相对于传感元件的数量（3-256在这项工作中使用），尺寸和间距。单个元件在几何上等同于半径为0.6-5 μ m的圆盘超微电极。伏安法测量可以在单独的传感元件、阵列的一部分或总线性整体处进行。阵列的响应接近但不完全等于各个传感元件的总和。对于较大的阵列，用微安范围内的电流（在乙腈中氧化1 mM二茂铁）产生稳态伏安图。所有构造的集合体都具有微电极特性，允许在没有故意添加电解质的情况下进行测量。此外，瞬态技术，如交流和脉冲伏安法可以应用于毫秒脉冲宽度在系统中与支持电解质和高电阻。市售的仪器可以很容易地与较大的阵列一起使用，如在这项工作中所证明的。表面积< 20/μ m 2的微电极（例如，半径r < 2.5/μ m的圆盘）的行为不同于常规尺寸的圆盘电极（例如，半径约1 mm或更大），因为非线性扩散是质量传递的主要模式（1-12）。稳态电流，
Gold and platinum linearvoltammetrlc microelectrode arrays constructed by lithographic technology have been developed. This technology enables greatversatility to be obtained with respect to number of sensing elements (3-256 used In this work), size, and spacing. Individual elements are geometrically equivalent to circular disk ultramicroelectrodes of radii 0.6-5/urn. Voltammetrlc measurements may be made at Individual sensing elements, part of the array, or the total linear ensemble. The response of the array Is close, but not exactly equal, to the sum of the Individual sensing elements. A steady-state voltammogram Is yielded with current In the microampere range (oxidation of 1 mM ferrocene In acetonitrile) for the larger arrays. All constructed ensembles ex-hibit microelectrode characteristics that permit measurements to be made In the absence of deliberately added electrolyte. Additionally, transient techniques such as ac andpulse voltammetry can be appliedwith millisecond pulse widths In systems with supporting electrolyte and with high resistance. Commercially available Instrumentation can readily be used with the larger arrays as Is demonstrated In this work.The behavior of microelectrodes with a surface area< 20/itm2 (eg, circular disk of radius, r,< 2.5/im) differs from conventional-sized disk electrodes (eg, radius approximately 1 mm or greater) in that nonlinear diffusion is the predom-inant mode of mass transport (1-12). Steady-state currents,