IEICE Transactions on Electronics
Online ISSN : 1745-1353
Print ISSN : 0916-8524
Regular Section
Amplified Redox Sensor for Highly Sensitive Chemical Analysis
Sou TAKAHASHIMasato FUTAGAWAMakoto ISHIDAKazuaki SAWADA
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2016 Volume E99.C Issue 1 Pages 95-99

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Abstract

Because redox sensors can detect multi-ions and the concentration within a single sensing area using current and potential signals, they have been studied for chemical analysis applications. A small sensing area and a low concentration measurement typically reduce the output current of a redox sensor. Therefore, we previously fabricated the Amplified Redox Sensor, which has a working electrode combined with a bipolar transistor to amplify a small current signal. However, the current gain of the bipolar transistor had been changed by the redox current because the redox current flows in the base terminal of the bipolar transistor. In this study, we propose a new measurement method in which an offset current is inserted along with the redox current in the base terminal. The proposed measurement method can detect potassium ferricyanide (K3[Fe (CN)6]) concentrations as low as 1μM using the Square Wave Voltammetry method.

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© 2016 The Institute of Electronics, Information and Communication Engineers
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