Noticeable improvement in the toxic gas-sensing activity of the Zn-doped TiO2 films for sensing devices

Zn-doped TiO2 films were deposited on ultrasonically treated alumina substrates via the automatic nebulizer spray pyrolysis method. In this study, the thickness of the as-prepared films was gradually reduced, and their Brunauer–Emmett–Teller (BET) surface area and pore volume results were notably im...

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Bibliographic Details
Published in:New journal of chemistry 2021-06, Vol.45 (23), p.10488-10495
Main Authors: Krishnan, V Gopala, Elango, P, Ravikumar, K, Marnadu, R, Aldossary, Omar M, Ubaidullah, Mohd
Format: Article
Language:English
Subjects:
Aluminum oxide
Ammonia
Flammability
Formaldehyde
Gases
Operating temperature
Sensors
Spray pyrolysis
Substrates
Thickness
Titanium dioxide
VOCs
Volatile organic compounds
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Summary:Zn-doped TiO2 films were deposited on ultrasonically treated alumina substrates via the automatic nebulizer spray pyrolysis method. In this study, the thickness of the as-prepared films was gradually reduced, and their Brunauer–Emmett–Teller (BET) surface area and pore volume results were notably improved; in addition, values for the blue-shifted sharp edge absorption with an enlarged bandgap (Eg) were revealed in the deposited films. The agglomerated granular form has evolved into tiny grains with porous brighter particles scattered over the surface of the coated films. The sensing performance to reducing gases for combustible gas of ammonia (NH3) and volatile organic compounds of methanol (CH4O) and formaldehyde (HCHO) with the function of operating temperature and gas concentration were studied, and the highest sensing response of the hazardous formaldehyde (HCHO) reducing gas was noticed.
ISSN:1144-0546
1369-9261
DOI:10.1039/d1nj01079d