Organic photoelectrochemical transistor based on Fe-MOF@PANI/Carbon fiber for uric acid detection

The Fe-MOF@PANI/Carbon fiber was prepared by solvothermal method and used as the gate of organic photoelectrochemical transistor (OPECT). The ratio of Fe-MOF to PANI was optimized to enhance the photoelectric signal transduction. In addition, the vertical configuration of devices was adopted to improve the sensor property. Under light illumination, the device shows good photoelectric conversion ability, periodic stability and duration stability. The uric acid biosensor was prepared by modifying the gate with urate oxidase. The sensitivity of sensors in the absence of light and under illumination is compared. The results show that the sensitivity of the sensor is significantly improved to 91.65 mV/decade under light. The linear relationship is good in the range of 1 nM-5 mM, with a correlation coefficient of R2=0.9506. The sensor can also be used under bending conditions and has been successfully applied to the detection of uric acid in human sweat samples, providing a viable solution for wearable electronic devices.