A Self-Powered Biosensor with a Flake Electrochromic Display for Electrochemical and Colorimetric Formaldehyde Detection

• DOI: 10.1021/acssensors.9b00917
• Publication Date: 2019-08-23T10:15:11Z
• Authors: Xiaoxuan Sun; He Zhang; Shuai Hao; Junfeng Zhai; Shaojun Dong
• Keywords: Prussian blue; Formaldehyde dehydrogenase; Methylene blue

The formaldehyde biosensors with the features of cost effectiveness, high specificity, easy operation, and simplicity are urgently desired in routing field detection formaldehyde. Here, we report a new design an enzymatic self-powered biosensor (ESPB) toward detection. ESPB involves dehydrogenase/poly-methylene green/buckypaper bioanode as sensing electrode Prussian blue/Au nanoparticles/carbon fiber paper cathode electrochromic display. Formaldehyde acts fuel to drive ESPB, relying on that concentration can be determined by both directly measuring variance short circuit current observing color change cathode. By current, linear range from 0.01 0.35 mM calculated limit 0.006 obtained, comparable or better than those reported before. distinguished easily exactly via naked eye after immersing solution for 90 s up mM, covering permissive level some standards associated environmental quality control. Specially, precisely quantified analyzing digitally using equation B/(R + G B). In following test real spiked samples tap water lake water, recovery ratios concentrations 0.010 0.045 tested between 95 100% digitally. addition, exhibits negligible interference acetaldehyde ethanol stored at 4 °C 21 days loss less 8% its initial value current. Therefore, capability working like disposable expected sensitive, simple, rapid, cost-effective colorimetric method selectivity