Light-powered cell for detection of glucose with the naked eye |
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| Institution: | 1. BioMark/ISEP, School of Engineering, Polytechnic Institute of Porto, Portugal;2. CEB, Center of Biological Engineering, Minho University, Portugal;3. CMEMS, Center for Microelectromechanical Systems, Minho University, Portugal;1. Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, University of Jinan, Jinan 250022, PR China;2. School of Material Science and Engineering, Materials Research Center for Energy and Photoelectrochemical Conversion, University of Jinan, Jinan 250022, PR China;1. Jiangsu Institute of Metrology, Nanjing, 210023, PR China;2. State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China;1. Department of Chemistry, Middle East Technical University, Ankara, 06800, Turkey;2. Department of Chemistry, Ordu University, Ordu, 52200, Turkey;3. The Center for Solar Energy Research and Application (GUNAM), Middle East Technical University, Ankara, 06800, Turkey;4. Technical Sciences, Vocational High School, Gazi University, 06374, Turkey;5. Department of Biotechnology, Middle East Technical University, Ankara, 06800, Turkey;6. Department of Polymer Science and Technology, Middle East Technical University, Ankara, 06800, Turkey;1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China |
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| Abstract: | A concept for light-powered visual detection of glucose is developed. The detection mechanism is based on pairing a photo-active anode with an electrochromic counter electrode. The photoelectrochemical reaction changes the oxidation state of the analyte, leading to a change in the color of the electrochromic material, which makes visual detection possible. All of the electrical charge required to change the color of the electrochromic material is supplied by the photoelectrochemical reaction powered by visible light, so no conventional energy source is required. The proposed system consists of hematite modified with nickel hydroxide (Ni(OH)2) as the photoanode, and Prussian blue deposited on a fluorine-doped tin oxide electrode as the electrochromic cathode. Under illumination, photo-oxidation of glucose at the photoanode is followed by reduction of Prussian blue to Prussian white at the cathode. The presence of glucose can therefore be detected visually as decolorization of Prussian blue occurs. |
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