NO_(2) gas sensor with high selectivity and fast response based on Pt-loaded nanoporous GaN  

作　　者：Dan Han Xiaoru Liu Donghui Li Jiexu Shi Yu Wang Yuxuan Wang Hongtao Wang Shengbo Sang 

机构地区：[1]Shanxi Key Laboratory of Micro/Nano Sensors&Artificial Intelligence Perception,College of Integrated Circuits,Taiyuan University of Technology,Taiyuan030024,China [2]Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China [3]Shanxi Research Institute of 6D Artificial Intelligence Biomedical Science,Taiyuan 030032,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第4期964-972,共9页矿物冶金与材料学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.62031022 and 52375572);the Key R&D Program of Shanxi Province,China(No.202102030201003);Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,China(No.2022SXAT001);Key Core Technological Breakthrough Program of Taiyuan City,China(No.2024TYJB0126).

摘　　要：In this work,we realized a room-temperature nitrogen dioxide(NO_(2))gas sensor based on a platinum(Pt)-loaded nanoporous gallium nitride(NP-GaN)sensing material using the thermal reduction method and coreduction with the catalysis of polyols.The gas sensor gained excellent sensitivity to NO_(2) at a concentration range of 200 ppm to 100 ppb,benefiting from the loading of Pt nanoparticles,and exhibited a short response time(22 s)and recovery time(170 s)to 100 ppm of NO_(2) at room temperature with excellent selectivity to NO_(2) compared with other gases.This phenomenon was attributed to the spillover effect and the synergic electronic interaction with semiconductor materials of Pt,which not only provided more electrons for the adsorption of NO_(2) molecules but also occupied effective sites,causing poor sites for other gases.The low detection limit of Pt/NP-GaN was 100 ppb,and the gas sensor still had a fast response 70 d after fabrication.Besides,the gas-sensing mechanism of the gas sensor was further elaborated to determine the reason leading to its improved properties.The significant spillover impact and oxygen dissociation of Pt provided advantages to its synergic electronic interaction with semiconductor materials,leading to the improvement of the gas properties of gas sensors.

关 键 词：nanoporous gallium nitride PLATINUM nitrogen dioxide gas sensor 

分 类 号：O64[理学—物理化学]