Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 3, Pages 2522-2527Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c03089
Keywords
TiO2; quantum dot; ultrafine nanoparticle; photodoping; gas sensor; room temperature; volatile organic compound
Funding
- Latvian Council of Science in the framework of FLPP [lzp-2018/1-0187]
- European Union [951774]
- ICREA Academia Program
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This study demonstrates a gas sensing approach based on photodoping using a thin TiO2 nanoparticle film activated by UV light. The material shows a 1 order of magnitude higher response toward ethanol under UV light compared to no light. This concept enables selective sensor material design.
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 photodopinginspired 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.
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