Photoconductivity studies on amorphous and crystalline TiO2 films doped with gold nanoparticles

Autor:	Manuel Aguilar-Franco, V. Rentería-Tapia, Guadalupe Valverde-Aguilar, Jorge A. García-Macedo
Rok vydání:	2011
Předmět:	Gans theory Anatase Materials science Absorption spectroscopy business.industry Photoconductivity Doping Analytical chemistry General Chemistry Amorphous solid Optics Rutile General Materials Science business Sol-gel
Zdroj:	Applied Physics A. 103:659-663
ISSN:	1432-0630 0947-8396
DOI:	10.1007/s00339-010-6199-6
Popis:	In this work, amorphous and crystalline TiO2 films were synthesized by the sol-gel process at room tem- perature. The TiO2 films were doped with gold nanopar- ticles. The films were spin-coated on glass wafers. The crystalline samples were annealed at 100°C for 30 minutes and sintered at 520°C for 2 h. All films were character- ized using X-ray diffraction, transmission electronic mi- croscopy and UV-Vis absorption spectroscopy. Two crys- talline phases, anatase and rutile, were formed in the ma- trix TiO2 and TiO2/Au. An absorption peak was located at 570 nm (amorphous) and 645 nm (anatase). Photoconductiv- ity studies were performed on these films. The experimental data were fitted with straight lines at darkness and under il- lumination at 515 nm and 645 nm. This indicates an ohmic behavior. Crystalline TiO2/Au films are more photoconduc- tive than the amorphous ones.
Databáze:	OpenAIRE
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