Enhanced acetone sensing performance in black TiO2 by Ag modification

The application of TiO 2 acetone monitor is highly limited by the high operating temperature and poor sensitivity. In this work, black TiO 2 (B-TiO 2 ) is produced by Ti 3+ self-doping and is followed by Ag modification to form B-TiO 2 @Ag. It is first demonstrated that the operating temperature and...

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Bibliographic Details
Published in:Journal of materials science 2020-08, Vol.55 (24), p.10399-10411
Main Authors: Yang, Wangyang, Shen, Honglie, Min, Huihua, Ge, Jiawei
Format: Article
Language:English
Subjects:
Acetone
Characterization and Evaluation of Materials
Chemical Routes to Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Gas sensors
Hall effect
Materials Science
Operating temperature
Photoelectricity
Polymer Sciences
Sensitivity
Silver
Solid Mechanics
Titanium dioxide
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Summary:The application of TiO 2 acetone monitor is highly limited by the high operating temperature and poor sensitivity. In this work, black TiO 2 (B-TiO 2 ) is produced by Ti 3+ self-doping and is followed by Ag modification to form B-TiO 2 @Ag. It is first demonstrated that the operating temperature and sensitivity of TiO 2 to acetone can be promoted evidently. By introducing a Ti 3+ self-doped layer on the surface of TiO 2 , as observed in TEM images, the band gap of TiO 2 is reduced to 3.01 eV. Ag surface decoration is carried out for the enhancement of electron generation. Optical absorption and the Hall effect results prove that B-TiO 2 @Ag exhibits highest photoelectrical properties. As a result, the B-TiO 2 @Ag gas sensor with a low operating temperature at 250 °C and high response of 68.19 to 50 ppm acetone is realized. The low detection limit of B-TiO 2 @Ag sensor reaches 887 ppb, which provides an applicable way for non-invasive detection of blood glucose.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-020-04703-6