In2O3-CuO的制备及其光活化下的室温甲醛气敏性能
Preparation of In2O3-CuO and its room temperature gas-sensitive properties for formaldehyde under photoactivation
韩君林 1刘锦梅 1孙建华 1孙丽霞 1廖丹葵1
作者信息
- 1. 广西大学 化学化工学院 广西石化资源加工及过程强化技术重点实验室,广西 南宁 530004
- 折叠
摘要
以InCl3·4H2O和Cu(NO3)2·3H2O为原料、尿素为沉淀剂,采用水热法制备了In2O3-CuO复合材料.通过 XRD、SEM、TEM、UV-Vis 吸收光谱、XPS、EIS 对其进行了表征,探究了紫外光活化 In2O3-CuO复合材料的气敏性能与传感机制.结果表明,In2O3-CuO 复合材料在 375 nm 紫外光照射室温(25℃)条件下对质量浓度 50 mg/L甲醛气体的灵敏度为 298,与纯In2O3(2.4)相比灵敏度提高 123 倍,气敏性能的巨大提升得益于In2O3 与CuO形成的p-n异质结,协同光活化条件下异质结界面产生的光生电子-空穴与氧物种(O2 和 O2-)间建立了氧的光活化吸附-解吸循环,使室温下材料的气体吸附-解吸过程和表面反应增强.
Abstract
In2O3-CuO composites were prepared from hydrothermal reaction of InCl3·4H2O and Cu(NO3)2·3H2O with urea as precipitant,characterized by XRD,SEM,TEM,UV-Vis absorption spectrum,XPS and EIS,and further evaluated for their gas-sensitive properties and sensing mechanism in UV excitation.The results showed that In2O3-CuO composites exhibited a sensitivity of 298 for formaldehyde gas with a mass concentration of 50 mg/L at room temperature(25℃)under 375 nm UV light irradiation,123 times more sensitive than pure In2O3(2.4).The significant improvement in gas sensitivity was attributed to p-n heterojunction formed by In2O3 and CuO,while the photogenerated electrons-hole,generated at the heterojunction interface under the synergistic photoactivation conditions,and the oxygen species(O2 and O2-)established a photoactivated adsorption-desorption cycle of oxygen,resulting in the enhancement of gas adsorption-desorption process and surface reaction of the material at room temperature.
关键词
In2O3-CuO/紫外光活化/室温气敏/p-n异质结/甲醛/功能材料Key words
In2O3-CuO/UV-photoactivation/room temperature gas sensitivity/p-n heterojunction/formaldehyde/functional materials引用本文复制引用
基金项目
国家自然科学基金(22165001)
国家自然科学基金(52002088)
广西自然科学基金(2018GXNSFAA294001)
出版年
2024
NETL
NSTL
万方数据