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The novel nanozyme-based electrochemical-driven electrochromic visual biosensor based on PEDOT:PSS/RGO conductive
Huanan Guan1, Yanyu Chen2, Dongxu Wang3
1School of Gain Science and Technology, Jiangsu University of Science and Technology, Zhenjiang 212000, People's Republic of China; College of Food Engineering, Harbin University of Commerce, Harbin 150076, People's Republic of China.
Abstract:
An efficient and facile nitrite (NO2-) detection system was developed using Fe3O4@Au-Cu/MOF, which was manufactured through self-assembly as the nanozyme, and a PEDOT:PSS/RGO thin film produced by chemical synthesis as the counter electrode, in conjunction with smartphone-based colorimetry. The Fe3O4@Au-Cu/MOF nanozyme exhibits remarkable catalytic efficiency and can significantly enhance the conversion of NO2-. PEDOT:PSS/RGO films exhibit outstanding electron transport and electrochromic properties. The color of PEDOT:PSS/RGO films can be modified by applying voltage and the electronic current generated by NO2- within the reaction system. The colorimetric assessment of film color alteration using a smartphone, supplemented by electrochemical validation. Under ideal conditions, the sensor detected NO2- within a linear range of 0.01 to 100 mmol/L and exhibited a detection limit of 3.37 μmol/L. This method demonstrated no significant difference compared to the results obtained using the electrochemical method and was effectively employed for the detection of NO2- in real samples.
