Journal
JOURNAL OF ADVANCED CERAMICS
Volume 11, Issue 10, Pages 1559-1570Publisher
SPRINGER
DOI: 10.1007/s40145-022-0629-8
Keywords
cerium oxide (CeO2); nanowire; oxygen vacancy; linalool; gas sensor
Categories
Funding
- National Natural Science Foundation of China [51872254]
- Outstanding Youth Foundation of Jiangsu Province of China [BK20211548]
- Yangzhou University
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In this study, the effective detection of volatile organic compounds (VOCs) at room temperature was achieved using cerium oxide (CeO2) nanowires by regulating their surface chemical state. The sample annealed under specific conditions exhibited outstanding sensing properties, including a high response, fast response and recovery time, and low detection limit. The practicality of the sensor was also verified by distinguishing different types of rice. This study provides a strategic material for the development of high-performance room temperature electronic nose equipment for monitoring rice quality.
It is a huge challenge for metal oxide semiconductor gas sensors to inspect volatile organic compounds (VOCs) at room temperature (RT). Herein, the effective utilization of cerium oxide (CeO2) nanowires for RT detection of VOCs was realized via regulating its surface chemical state. Oxygen vacancy engineering on CeO2 nanowires, synthesized via hydrothermal method, can be manipulated by annealing under various controlled atmospheres. The sample annealed under 5%H-2+95%Ar condition exhibited outstanding RT sensing properties, displaying a high response of 16.7 towards 20 ppm linalool, a fast response and recovery time (16 and 121 s, respectively), and a low detection of limit of 0.54 ppm. The enhanced sensing performance could be ascribed for the synergistic effects of its nanowire morphology, the large specific surface area (83.95 m(2)/g), and the formation of extensive oxygen vacancy accompanied by an increase in Ce3+. Additionally, the practicability of the sensor was verified via two varieties of rice (Indica and Japonica rice) stored in various periods (1, 3, 5, 7, 15, and 30 d). The experimental results revealed that the sensor was able to distinguish Indica rice from Japonica rice. Accordingly, the as-developed sensor delivers a strategic material to develop high-performance RT electronic nose equipment for monitoring rice quality.
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