Constructing Z-Scheme WO3–CeO2 Heterojunctions for Selective Sensing of NO2 or Acetone Gas under UV Light Irradiation
Source abstract
Abstract
Light assistance and the construction of heterojunctions between two semiconductors with matching band structures are effective strategies for obtaining efficient gas sensors. Recently, Z-scheme heterojunctions have shown marked potential in promoting the separation and transfer of photogenerated carriers as well as possessing strong redox capability. In this study, two types of nanocomposites of WO 3 /CeO 2 and CeO 2 /WO 3 with Z-scheme heterojunctions were designed and prepared with WO 3 and CeO 2 as host materials, respectively. In the case of the WO 3 /CeO 2 nanocomposite, the CeO 2 nanoparticles are evenly distributed and attached to the WO 3 host. Conversely, in the CeO 2 /WO 3 nanocomposite, WO 3 is completely covered by the CeO 2 nanoparticles, forming a core–shell structure. The construction of Z-scheme heterojunctions effectively suppresses the recombination of photogenerated carriers, generates more active sites, and enhances redox capability. Resultantly, under UV light assistance, the sensors based on heterojunctions of WO 3 /CeO 2 and CeO 2 /WO 3 exhibit a selective response toward the oxidizing gas of NO 2 and the reducing gas of acetone, respectively, at room temperature. The WO 3 /CeO 2 sensor exhibits a response of 6.82 toward 100 ppb NO 2, while the CeO 2 /WO 3 sensor exhibits a response of 6.45 toward 10 ppm acetone at room temperature (RT) under UV irradiation. The dynamic response/recovery characteristics of both heterojunction sensors were improved by UV irradiation, with an obvious shortening of the response/recovery time compared to the case in the dark. The experimental results demonstrate that the two sensors are capable of detecting NO 2 and acetone gases at RT, respectively. This work expands the application of Z-scheme heterojunctions in gas sensing and provides a strategy based on the design of special Z-scheme heterojunctions for developing high-performance gas sensors toward selective detection of oxidizing or reducing gas.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · ZnO doping and properties · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Microelectronics, Tianjin University, Tianjin 300072, China
Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin 300072, China
Key Laboratory for Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Funding
National Natural Science Foundation of China
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