Application of acoustic impedance method to monitoring of sensors: Metal deposition on viscoelastic polymer substrate

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• 作者：V.-T. Gruia ; A. Ispas ; M. Wilke ; I. Efimov ; A. Bund
• 关键词：PEDOT ; EQCM in dispersive mode ; Electroless gold deposition ; Viscoelasticity
• 刊名：Electrochimica Acta
• 出版年：1 February, 2014
• 年：2014
• 卷：118
• 期：Complete
• 页码：88-91
• 全文大小：784 K

文摘

Due to its good electrochemical stability, high conductivity and chemical properties, Poly(3,4-ethylenedioxythiophene) (PEDOT) is one of the most widely used conducting polymers in biosensors field. In this present article a sensor obtained by electroless deposition of gold on top of polymer (PEDOT) viscoelastic layer on quartz crystal microbalance is described. The acoustic impedance of such bi-layer (Au/PEDOT) is different from the one obtained when rigid mass is added directly on quartz surface. Consequently, the Sauerbrey equation overestimates significantly the deposited mass of Au. A procedure to account correctly for viscoelastic properties in estimation of added mass of metal is proposed in this article.