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Sensors 2017, 17(2), 276;

A Paper-Based Electrochromic Array for Visualized Electrochemical Sensing

State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
Laboratory of Environment and Biosafety, Research Institute of Southeast University in Suzhou, Suzhou 215123, China
Author to whom correspondence should be addressed.
Received: 30 November 2016 / Accepted: 5 January 2017 / Published: 31 January 2017
(This article belongs to the Special Issue Point-of-Care Biosensors)
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We report a battery-powered, paper-based electrochromic array for visualized electrochemical sensing. The paper-based sensing system consists of six parallel electrochemical cells, which are powered by an aluminum-air battery. Each single electrochemical cell uses a Prussian Blue spot electrodeposited on an indium-doped tin oxide thin film as the electrochromic indicator. Each electrochemical cell is preloaded with increasing amounts of analyte. The sample activates the battery for the sensing. Both the preloaded analyte and the analyte in the sample initiate the color change of Prussian Blue to Prussian White. With a reaction time of 60 s, the number of electrochemical cells with complete color changes is correlated to the concentration of analyte in the sample. As a proof-of-concept analyte, lactic acid was detected semi-quantitatively using the naked eye. View Full-Text
Keywords: electrochromism; paper; battery; POCT electrochromism; paper; battery; POCT

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Zhang, F.; Cai, T.; Ma, L.; Zhan, L.; Liu, H. A Paper-Based Electrochromic Array for Visualized Electrochemical Sensing. Sensors 2017, 17, 276.

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