Photodoping-Inspired Room-Temperature Gas Sensing by Anatase TiO2 Quantum Dots
ACS Applied Nano Materials 2021
Andris Šutka, Raivis Eglītis, Annija Kraukle, Krišjānis Šmits, Anzelms Zukuls, Joan Daniel Prades, Cristian Fabrega

Detection of volatile organic compounds (VOCs) at room temperature in an ambient environment is highly desired, but still a distant function for gas sensor materials. Here, we are demonstrating a photodoping-inspired gas sensing approach based on a thin solid film made of ultrasmall (<5 nm) TiO2 nanoparticles. The gas sensing material has been activated by UV light-generating electrons and holes. In the presence of VOCs acting as scavengers of photogenerated holes, the electrical resistance of the sensor element significantly decreases because of electron accumulation. The material shows a 1 order of magnitude higher response toward ethanol under UV light than in the absence of light. The proposed concept enables a selective sensor material design.

Chemical detection; Oxide minerals; Semiconductor doping; TiO2 nanoparticles; Titanium dioxide; Volatile organic compounds

Šutka, A., Eglītis, R., Kraukle, A., Šmits, K., Zukuls, A., Prades, J., Fabrega, C. Photodoping-Inspired Room-Temperature Gas Sensing by Anatase TiO2 Quantum Dots. ACS Applied Nano Materials, 2021, Vol. 4, No. 3, pp.2522-2527. ISSN 2574-0970. Available from: doi:10.1021/acsanm.0c03089

Publication language
English (en)
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