Journal
ACS COMBINATORIAL SCIENCE
Volume 16, Issue 11, Pages 631-639Publisher
AMER CHEMICAL SOC
DOI: 10.1021/co5000536
Keywords
combinatorial thin film material library; molybdenum-tungsten oxides; surface structuring; antibacterial properties
Funding
- Austrian Federal Ministry of Economy, Family and Youth
- National Foundation for Research, Technology and Development
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A combinatorial thin film material library from the molybdenumtungsten refractory metals oxides system was prepared by thermal coevaporation, and its structural and morphological properties were investigated after a multiple step heat treatment. A mixture of crystalline and amorphous oxides and suboxides was obtained, as well as surface structuring caused by the enrichment of molybdenum oxides in large grains. It was found that the oxide phases and the surface morphology change as a function of the compositional gradient. Tests of the library antimicrobial activity against E. coli were performed and the antimicrobial activity was proven in some defined compositional ranges. A mechanism for explaining the observed activity is proposed, involving a collective contribution from (i) increased local acidity due to the enrichment in large grains of molybdenum oxides with different stoichiometry and (ii) the release of free radicals from the W18O49 phase under visible light.
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