Electrolyte-gated SrCoO_(x) FET sensor for highly sensitive detecting pH in extreme alkalinity solution  

作　　者：Han Zhou Gaocan Qi Wenbin Li Yuhang Wang Zhihao Yuan 

机构地区：[1]School of Materials Science and Engineering,Tianjin Key Lab of Photoelectric Materials&Devices,and Key Laboratory of Display Materials and Photoelectric Devices(Ministry of Education),Tianjin University of Technology,Tianjin 300384,China

出　　处：《Nano Research》2024年第4期3079-3086,共8页纳米研究（英文版）

基　　金：supported by the National Nature Science Foundation of China(No.21501132);the Natural Science Foundation of Tianjin City(No.20JCZDJC00280);the National Key R&D Program of China(No.2017YFA0700104).

摘　　要：The pH monitoring is significantly important in chemical industry,biological process,and pollution treatment.However,it remains a great challenge to measure pH in extreme alkalinity conditions.Herein,we employ an electrolyte-gated field-effect-transistor(FET)strategy using non-stoichiometric SrCoO_(x) with rich oxygen-vacancy defects as channel materials for detecting extreme alkalinity.The corresponding channel can provide effective oxygen-ion-migration sites for reversible transformation of OH-↔O_(2)-+H^(+)driven by electric field.The resultant electrolyte-gated FET sensor exhibits a sensitive linear response to high concentrations of alkaline solution,1–20 M.Significantly,the sensor has the ability to directly indicate the pH values ranging from 14.0 to 17.0 in consideration of ion-activity coefficient data.This work offers a great possibility for directly detecting base concentration as well as pH values in extreme alkaline solutions.

关 键 词：field-effect-transistor(FET) pH sensor extreme alkaline solution SrCoO_(x) oxygen-ion migration 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]