2026-04-22T20:18:25Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/57362024-07-25T07:25:13Zcom_10259_9476com_10259.4_106com_10259_2604col_10259_9477

Mesoscale organization of titania thin films enables oxygen sensing at room temperature Rassu, Pietro Malfatti, Luca Carboni, Davide Casula, Maria F. Garroni, Sebastiano Zampetti, Emiliano Macagnano, Antonella Bearzotti, Andrea Innocenzi, Plinio 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. 2021-04-27T09:41:21Z 2021-04-27T09:41:21Z 2021-04-27T09:41:21Z 2017-12 info:eu-repo/semantics/article 2050-7526 http://hdl.handle.net/10259/5736 10.1039/C7TC03397D 2050-7534 eng Journal of Materials Chemistry C. 2017, V. 5, n. 45, p. 11815-11823 https://doi.org/10.1039/C7TC03397D info:eu-repo/grantAgreement/Regione Lombardia/INSTMRL6 info:eu-repo/semantics/openAccess Royal Society of Chemistry