分析化学2026，Vol.54Issue(6)：1113-1120,8.DOI:10.19756/j.issn.0253-3820.261058
基于铁酸镧/氧化锌异质结纳米材料的薄膜型二氧化碳传感器
Thin-Film CO2 Sensor Based on LaFeO3/ZnO Heterojunction Nanomaterials
摘要
Abstract
To address the bottlenecks of high operating temperature and slow response/recovery kinetics of metal oxide semiconductor-based carbon dioxide(CO2)sensors,lanthanum ferrite/zinc oxide(LaFeO3/ZnO)nanocomposites were fabricated via a hydrothermal-sol-gel composite process and coated onto ceramic tubes to construct CO2 sensors.X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)analyses confirmed the microstructure and elemental chemical states of the materials.The as-constructed sensor exhibited a response of 3.15 toward 1080 mg/m3 CO2 at room temperature((25±2)℃)with response/recovery time of 8.2 s and 11.4 s,respectively,demonstrating excellent selectivity,cycling stability,and quantitative accuracy.Density functional theory(DFT)calculations revealed the room-temperature gas-sensing enhancement mechanism:the LaFeO3/ZnO p-n heterojunction generated a built-in electric field at the interface that effectively promotes carrier separation;oxygen vacancies and basic sites on the LaFeO3 surface enhanced the preferential chemisorption of CO2;and the elevated conduction band density of states facilitated electron transition and increased the free carrier concentration.These synergistic effects endowed the sensor with stable CO2 detection capability at room temperature,offering new material strategies and theoretical support for the design of high-performance room-temperature CO2 sensors.关键词
铁酸镧/氧化锌/传感器/异质结/二氧化碳Key words
Lanthanum ferrite/Zinc oxide/Sensor/Heterojunction/Carbon dioxide引用本文复制引用
胡明江,王军豪,牛哲荟,王旭荣,刘新户..基于铁酸镧/氧化锌异质结纳米材料的薄膜型二氧化碳传感器[J].分析化学,2026,54(6):1113-1120,8.基金项目
国家自然科学基金项目(No.52106006)和河南省科技攻关计划项目(No.262102240084)资助. Supported by the National Natural Science Foundation of China(No.52106006)and the Science and Technology Foundation of Henan Province,China(No.262102240084). （No.52106006）
