Give it some stick: UV irradiation of spirothiopyran in an aqueous solution of gold nanoparticles (AuNPs) gives AuNP aggregates. The aggregate size is tuned by the photoirradiation time and the aggregation is facilitated by the covalent binding of photoisomerized spirothiopyran to the surface of the AuNPs. This binding decreases the electrostatic repulsion between the AuNPs.
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Shiraishi et al. (2013) studied this question.
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