1. Semiconducting ZnO Nanofibers as Gas Sensors and Gas Response Improvement by SnO2 Coating
- Author
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Su-Jae Lee, Taehyoung Zyung, Jin-Ah Park, and Jaehyun Moon
- Subjects
Materials science ,General Computer Science ,Polyaniline nanofibers ,Oxide ,Nanotechnology ,engineering.material ,Electronic, Optical and Magnetic Materials ,law.invention ,chemistry.chemical_compound ,chemistry ,Coating ,law ,Nanofiber ,engineering ,Grain boundary ,Calcination ,Crystallite ,Electrical and Electronic Engineering ,Wurtzite crystal structure - Abstract
ZnO nanofibers were electro-spun from a solution containing poly 4-vinyl phenol and Zn acetate dihydrate. The calcination process of the ZnO/PVP composite nanofibers brought forth a random network of polycrystalline wurtzite ZnO nanofibers of 30 nm to 70 nm in diameter. The electrical properties of the ZnO nanofibers were governed by the grain boundaries. To investigate possible applications of the ZnO nanofibers, their CO and NO 2 gas sensing responses are demonstrated. In particular, the SnO2-deposited ZnO nanofibers exhibit a remarkable gas sensing response to NO2 gas as low as 400 ppb. Oxide nanofibers emerge as a new proposition for oxide-based gas sensors.
- Published
- 2009