Journal
RSC ADVANCES
Volume 3, Issue 22, Pages 8541-8550Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra23271a
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Funding
- European Union [253445]
- Marie Curie [FP7-PEOPLE-2009-IEF-253445]
- MINECO program Ramon y Cajal
- [CTQ2010-14872/BQU]
- [PLE2009-0037]
- [PRI-PIBJP-2011-0914]
- [MAT2010-17016]
- [MAT2010-19883]
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The role of TiO2 morphological characteristics in the ultimate performance of advanced, light-triggered EVOH-TiO2 nanocomposite films is analyzed using four different inorganic anatase-TiO2 materials obtained from the same initial solid precursor. Morphological variations in the inorganic component lead to differences in the inorganic-organic interface, described here through a detailed structural investigation using wide angle X-ray diffraction (WAXS), Raman and attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopies together with microscopy tools. Two significant properties of these composite films induced by light absorption were studied: a) the self-degradation of the films under sunlight and b) their self-cleaning or disinfection properties against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria upon UV excitation. The analysis of results provides evidence that, within the series of samples studied, the optimization of these two light-induced properties is related to specific morphological aspects of the oxide component. The different charge carrier species involved in the two processes allow rationalizing the self-degradation as a main function of primary particle size of the oxide component while the self-cleaning properties seem to be related to a more complex root on oxide morphological features, likely associated with particle-particle networking details.
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