期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 72, 期 2, 页码 160-166出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(00)00646-8
关键词
Tin dioxide thin-films; carbon monoxide and hydrogen sensing; iIntegrated gas sensor array
This paper reports on the preparation, electrical and surface characterization of Cu doped tin dioxide thin-films for highly selective integrated gas sensor devices. The 3000 Angstrom thin-film of 0.16 wt.% copper doped tin dioxide was deposited by reactive R.F. sputtering at room temperature and followed by 10 Angstrom Pt on top of Cu doped tin dioxide thin-film (SnO2-Cu/Pt). In another batch, the 100 Angstrom SiO2 thin-film was deposited on top of the SnO2-Cu/Pt thin-film structure (SnO2-Cu/Pt/SiO2). The electrical response of these thin-films was investigated for CO and H-2 gases at different temperatures and gas concentrations. The device with the SnO2-Cu/Pt thin-film, showed excellent electrical response towards CO gas and device with SnO2-Cu/Pt/SiO2 thin-film showed response towards hydrogen only. The SiO2 thin-film prevents the diffusion of CO gas and only hydrogen gas diffuse through silicon dioxide layer. Using thin-films structure SnO2-Cu/Pt and SnO2-Cu/Pt/SiO2, a highly selective sensor device for CO and H-2 gas was fabricated. The surface characterization of these thin-films was performed using scanning electron microscopy (SEM) and X-ray photoemission spectroscopy (XPS) techniques. The SEM picture showed that surface structure of the SnO2 thin-film improved by copper doping. (C) 2001 Elsevier Science B.V. All rights reserved.
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