Reversible antimicrobial photoswitching of nanosilver on a semiconductor support using a facile and optically selective approach is demonstrated. The non-intrusive cyclical irradiation by UV-A (300–400 nm) and visible light (>450 nm) result in controlled oxidation state dynamics of the nanosilver, which in turn allows its antimicrobial activity to be switched off and on repeatedly (see image).
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Gunawan et al. (2009) studied this question.
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