Macroporous Ultramicroelectrodes for Improved Electroanalytical Measurements
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- 作者：Rafael Szamocki ; Alexandra Velichko ; Christian Holzapfel ; Frank Mü ; cklich ; Serge Ravaine ; Patrick Garrigue ; Neso Sojic ; Rolf Hempelmann ; Alexander Kuhn
- 刊名：Analytical Chemistry
- 出版年：2007
- 出版时间：January 15, 2007
- 年：2007
- 卷：79
- 期：2
- 页码：533 - 539
- 全文大小：351K
- 年卷期：v.79,no.2(January 15, 2007)
- ISSN：1520-6882
文摘
Recent work on the preparation of highly organizedmacroporous electrodes and nanoporous ultramicroelectrodes has been combined and extended to elaboratemacroporous ultramicroelectrodes (UMEs) by templatesynthesis using colloidal crystals and following two different and complementary methods. On the one hand,arched porous UMEs were prepared, and on the otherhand, cylindrical porous UMEs were obtained by usingcavity UMEs. These macroporous UMEs have an activesurface area which is up to 2 orders of magnitude highercompared to that of a classical disk UME as characterizedby cyclic voltammetry. To study their analytical performance, the macroporous UMEs have been modified witha redox-active thiol and also a model bioelectrocatalyticalsystem containing a redox mediator, a cofactor, andglucose-dehydrogenase. In both cases the electrochemicalsignal is amplified by up to 2 orders of magnitude, whichincreases significantly the analytical performance of suchelectrodes and therefore opens up new applications forthis kind of miniaturized electrochemical system.