We detected singlet molecular oxygen (1O2) with a near-infrared phosphorescence peak at 1270 nm in photocatalysis of gold-nanoparticle-deposited titanium dioxide (AuNP/TiO2) by the excitation of surface plasmon resonance. The formation of 1O2 indicates a possible application of AuNP/TiO2 for photodynamic therapy.
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Saito et al. (2012) studied this question.
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