Spirally oriented Au microelectrode array sensor for detection of Hg (II)

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• 作者：Tran Ngoc Huan^a ; Le Quoc Hung^b ; Vu Thi Thu Ha^b ; Nguyen Hoang Anh^b ; Tran Van Khai^c ; Kwang Bo Shim^c ; Hoeil Chung^a ; ^{hoeil@hanyang.ac.kr}
• 关键词：Microelectrode array sensor ; Carbon fiber ; Gold microelectrode ; Mercury detection ; Diffusive interference
• 刊名：Talanta
• 出版年：2012
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：30 May, 2012
• 卷：94
• 期：Complete
• 页码：284-288
• 文件大小：660 K

摘要

A simple and reproducible carbon microelectrode array (CMA), designed to eliminate diffusive interference among the microelectrodes, has been fabricated and used as a frame to build a gold (Au) microelectrode array (GMA) sensor. To prepare the CMA initially, rather than use an uncontrollable large number of carbon fibers, only 60 carbon fibers of regular size were used to ensure manageable and reproducible arrangement for array construction. In addition, for efficient spatial arrangement of the microelectrode and easy sensor preparation, carbon fibers were oriented in a spiral fashion by rolling around a Cu wire. The distance between carbon fibers was carefully determined to avoid overlap among individual diffusion layers, one of the important factors governing steady-state current response and sensor-to-sensor reproducibility. After the preparation of a spirally arranged CMA, Au was electrochemically deposited on the surface of individual carbon electrodes to build a final GMA sensor. Then, the GMA sensor was used to measure Hg²⁺ in a low concentration range. Simultaneously, multiple GMA sensors were independently prepared to examine reproducibility in sensor fabrication as well as electrochemical measurement (sensor-to-sensor reproducibility). Overall, highly sensitive detection of Hg²⁺ was possible using the proposed GMA sensor due to efficient arrangement of microelectrodes and the sensor-to-sensor reproducibility was superior owing to simplicity in sensor fabrication.