UV enhanced SnO2/TiO2 nanorods-based flexible room temperature sensor by tuning interfacial chemistry and microstructure

被引：0
作者：
Xu, X. L. [1 ]
Wang, M. Y. [1 ]
Jiang, H. . T. [1 ]
Liu, W. . W. [1 ]
Sun, G. . R. [1 ]
Ma, W. [1 ]
机构：
[1] Northwest Normal Univ, Coll Phys & Elect Engn, Key Lab Atom & Mol Phys & Funct Mat Gansu Prov, Lanzhou 730070, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2025年 / 435卷
基金：
中国国家自然科学基金;
关键词：
Flexible sensor; Ultraviolet irradiation; Semiconductor; Acetic acid; Room temperature; GAS; NO2;
D O I：
10.1016/j.snb.2025.137680
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The high working temperature of metal oxide semiconductors hinders its application in flexible sensing devices. In this paper, a UV-activated flexible sensor operating at room temperature (RT, 25 degrees C) is first reported based on SnO2 nanoparticles embedded in photo-catalytic TiO2 nanorods matrix. The UV-irradiated SnO2/TiO2 sensor exhibits excellent selectivity (109 ppm, 37 %) to CH3COOH and reduced response/recovery time (12 s/41 s). The excellent RT flexible sensing properties are attributed to the synergistic action of UV-365 nm irradiation, the hetero-embedded microstructure and innovative terpineol binder. UV irradiation generates substantial eh upsilon-h+h upsilon pairs, which serve as active sites to promote the chemisorption and redox reactions. Additional activation energy helps to improve adsorption/desorption kinetics. The heterojunction provides abundant channels, facilitating the separation and transfer of photogenerated carriers. The effect of relative humidity (RH) and temperature variations around RT on the sensor response towards CH3COOH are investigated. Under low-RH (35 %-45 %) and high-RH conditions (above 45 %), 1 % RH change has the same effect on the sensor response than 7.2 ppm and 59.4 ppm CH3COOH, respectively. 1 degrees C temperature change exhibits the same effect than 17.9 ppm CH3COOH. Such a noise effect is by far not suitable for real-world applications. In addition, the response to 109 ppm CO reaches up to 89.5. Therefore, the sensor is seriously disturbed by CO and further research is needed. Above all, UV assistants, hetero-composites combining with innovative microstructure design are expected to be a collaborative enhancement strategy for MOSs-based RT flexible sensors.
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页数：11
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