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首页> 外文期刊>Advanced functional materials >Turning on High-Sensitive Organic Electrochemical Transistor-Based Photoelectrochemical-Type Sensor over Modulation of Fe-MOF by PEDOT
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Turning on High-Sensitive Organic Electrochemical Transistor-Based Photoelectrochemical-Type Sensor over Modulation of Fe-MOF by PEDOT

机译：Turning on High-Sensitive Organic Electrochemical Transistor-Based Photoelectrochemical-Type Sensor over Modulation of Fe-MOF by PEDOT

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摘要

Low-gate voltages can make large modulations in the drain current. Accordingly,organic electrochemical transistors (OECTs) have attracted considerable interestas amplifying transducers. The use of OECTs in combination with electrochemicalanalysis promises to promote sensing performance. Herein, an OECT-basedphotoelectrochemical-type (OECT-PEC) sensor is constructed based on the photoinducedpotential generating variation in the drain current. The as-constructedOECT-PEC sensor has high sensitivity because the device incorporated asensor and an amplifier, providing the benefits of a PEC sensor and an OECT.In addition to the advantages of excellent signal amplification and ease ofminiaturization, background signals are also effectively reduced, and possibleinterferences from electroactive substances are avoided due to the separation oflight excitation and the electric output. The OECT-PEC sensor integrates poly(3,4-ethylenedioxythiophene) (PEDOT)-modulated Fe-metal organic framework(Fe-MOF) nanocomposites as the photo-active gating material and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the channelmaterial which exhibits a good photocurrent response from the gate electrodeand a corresponding 100-fold expansion channel response. With aptamer as therecognition element, a sensitive OECT-PEC biosensor is constructed to detect theorganophosphorus pesticide malathion. It is found to exhibit a good linear range,a low detection limit, and better sensitivity than the traditional PEC method.

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