Optimization and gas sensing mechanism of n-SnO₂-p-Co₃O₄ composite nanofibersOptimization and gas sensing mechanism of n-SnO2-p-Co3O4 composite nanofibers
- Other Titles
- Optimization and gas sensing mechanism of n-SnO2-p-Co3O4 composite nanofibers
- Authors
- Kim, Jae-Hun; Lee, Jae-Hyoung; Mirzaei, Ali; Kim, Hyoun Woo; Kim, Sang Sub
- Issue Date
- Sep-2017
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- SnO2-CO3O4; Nanofiber; Composite; Heterojunction; Gas sensor
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.248, pp.500 - 511
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 248
- Start Page
- 500
- End Page
- 511
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/18810
- DOI
- 10.1016/j.snb.2017.04.029
- ISSN
- 0925-4005
- Abstract
- Although the employment of n-p heterojunctions is among the most popular strategies to increase the performance of gas sensors, there have been a few systematic studies to determine the optimal composition in n-p heterojunctions. This paper reports the results of a systematic study of (n) xSnO₂-(p) (1-x) Co₃O₄ composite nanofibers (NFs) for gas sensing applications. Composite NFs were synthesized by the electrospinning method followed by annealing at 600 °C. For gas sensing studies, several gases at optimal working temperature (350 °C) were tested. Depending on the nominal composition, the sensors showed either n-or p-type behavior as well as different responses to the target gases. Furthermore, for all gases tested, the 0·5SnO₂-0·5Co₃O₄ sensor (nominal composition) showed the best gas sensing characteristics. The underlying gas sensing mechanism was examined in detail. The highest response observed in the 0·5SnO₂-0·5Co₃O₄ NFs sensor was primarily attributed to the major role of the p-Co₃O₄ nanograins as electron reservoir. In addition, the possible substitution of Co⁺²/Co⁺³ in Sn⁺⁴ sites, the catalytic effect of Co₃O₄ and generation of defects were likely to be the secondary reasons. This highlights the importance of the optimal composition for achieving the maximum gas-sensing performance in n-p composite NFs.
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