tailieunhanh - Báo cáo hóa học: " Two-Functional Direct Current Sputtered Silver-Containing Titanium Dioxide Thin Films"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Two-Functional Direct Current Sputtered Silver-Containing Titanium Dioxide Thin Films | Nanoscale Res Lett 2009 4 313-320 DOI s11671-008-9244-z NANO EXPRESS Two-Functional Direct Current Sputtered Silver-Containing Titanium Dioxide Thin Films J. Musil M. Louda R. Cerstvy P. Baroch I. B. Ditta A. Steele H. A. Foster Received 23 October 2008 Accepted 30 December 2008 Published online 27 January 2009 to the authors 2009 Abstract The article reports on structure mechanical optical photocatalytic and biocidal properties of Ti-Ag-O films. The Ti-Ag-O films were reactively sputter-deposited from a composed Ti Ag target at different partial pressures of oxygen pO2 on unheated glass substrate held on floating potential Ufl. It was found that addition of 2 at. of Ag into TiO2 film has no negative influence on UV-induced hydrophilicity of TiO2 film. Thick 1 500 nm TiO2 Ag films containing 200 anatase phase exhibit the best hydrophilicity with water droplet contact angle WDCA lower than 10 after UV irradiation for 20 min. Thick 1 500 nm TiO2 Ag films exhibited a better UV-induced hydrophilicity compared to that of thinner 700 nm TiO2 Ag films. Further it was found that hydrophilic TiO2 Ag films exhibit a strong biocidal effect under both the visible light and the UV irradiation with 100 killing efficiency of Escherichia coll ATCC 10536 after UV irradiation for 20 min. Reported results show that single layer of TiO2 with Ag distributed in its whole volume exhibits after UV irradiation simultaneously two functions 1 excellent hydrophilicity with WDCA 10 and 2 strong power to kill E. coli even under visible light due to direct toxicity of Ag. Keywords TiO2 Ag addition Mechanical properties Hydrophilicity Biocidal activity Sputtering J. Musil El M. Louda R. Cerstvy P. Baroch Department of Physics Faculty of Applied Sciences University of West Bohemia Univerzitni 22 306-14 Plzen Czech Republic e-mail musil@ I. B. Ditta A. Steele H. A. Foster Biomedical Sciences Research Institute University of Salford Salford M5 4WT UK Introduction In recent years a