Abstract
Anthracene (AN) attachment to silica nanoparticles leads to multiple fluorescence lifetimes, due to different environments on the silica surface. Under ultraviolet (365 nm) illumination, the AN surface groups undergo a [4 + 4] photodimerization reaction that cross-links the nanoparticles and induces aggregation. The kinetics of both intra- and inter-particle photochemical reactions are measured by monitoring changes in the surface-bound AN absorbance at different nanoparticle concentrations. Our results confirm that the AN photodimerization reaction can be used to cross-link silica NPs but also suggest that silica’s chemical heterogeneity enables competing reactions that reduce the efficiency of the photochemical cross-linking.
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