Journal
RSC ADVANCES
Volume 4, Issue 66, Pages 35084-35088Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra06143h
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Funding
- grant (TRF-CHE-KU Research Grant for New Scholar) from Thailand Research Fund, Commission on Higher Education
- Kasetsart University Research and Development Institute [MRG 5580229]
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A novel fabrication of microelectronic nose based on ZnO nanowires and ZnO surface modifications including ZnO-ZnAl2O4 core-shell nanowires and ZnO-Zn2TiO4 core-shell nanowires gas-sensing elements operated at room temperature is reported. By combining vapor-phase transport processes and atomic layer deposition techniques, highly homogeneous core-shell nanowires structures can be successfully obtained on large scale areas. Under ultraviolet illumination of the specific oxide surfaces, photo-stimulated oxygen species (O-2(-) (ads)) respond to and dominate the gas sensing mechanism of the core-shell nanowires at room temperature. Principal component analysis results show the perfect discrimination of gases including toxic gases and non-toxic gases. This novel device can be used to identify both gas types with concentrations in the ppb level at room temperature.
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