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Fabrication of silicon-based bulk micro-machined amperometric microelectrode biosensor

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6 Author(s)
Jingwei Liu ; Inst. of Electron., Acad. Sinica, Beijing, China ; Jinghong Han ; Shanhong Xia ; Chao Bian
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A new silicon-based bulk micro-machined amperometric microelectrode biosensor, especially its fabrication, is provided. We designed the biosensor and fabricated it with anisotropic silicon wet etching. P-type silicon wafers are used as substrates, and Au and SU-8 are used for making electrodes and micro reaction pools, respectively. To our knowledge, consecutive platinization and polymerization of pyrrole is firstly used for surface modification. Successful experimental results have been achieved for glucose detection. It has several advantages, such as smaller sensitive surface area (1 mm×1 mm), lower detection limit (1×104 M), broader linear range (1×10-4 -1×10-2 M), larger sensitive coefficient (39.640 nA·mm-2·mM-1), better replicability (RSD 3.2% for five respective detections) and stability (sensitive coefficient remains well above 95% after being stored in a clean container at room temperature for a month), easier to be made into arrays and to be integrated with processing circuitry, etc.

Published in:

Solid-State and Integrated Circuits Technology, 2004. Proceedings. 7th International Conference on  (Volume:3 )

Date of Conference:

18-21 Oct. 2004

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