期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 5, 期 45, 页码 11815-11823出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc03397d
关键词
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资金
- project Bando Capitale Umano ad Alta Qualificazione annualita [CRP 30 L.R. 7/2007]
- project Mi ADATTI E L'ABBATTI''- INSTM-Regione Lombardia project [INSTMRL6]
The application of titania materials to gas sensing devices based on thin films are of limited utility because they only operate at a high working temperature and exhibit in general a low sensitivity. To overcome these constraints, a new type of oxygen sensor based on mesoporous titania thin films working at room temperature under UV irradiation has been developed. The increased density of charge carriers induced by the photoconductive effect, has been used to enhance the sensitivity of the thin oxide layers. Mesostructured titania films have been prepared via self-assembly and thermal processing to remove the organic template obtaining anatase nanocrystals. The mesoporous films show a striking decrease of the current in the presence of oxygen that acts as an electron scavenger. Mesoporous samples exhibit a much higher response with respect to dense titania, due to the higher surface area and the larger number of surface defects.
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