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Stepwise Thermal and Photothermal Dissociation of a Hierarchical Superaggregate of DNA-Functionalized Gold Nanoparticles



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Hierarchical superaggregates consisting of DNA-linked 14 nm AuNPs are synthesized and characterized by optical and scattering methods. Temperature changes, induced either thermally or photothermally, lead to a switching between specific sizes associated with superaggregates, primary networks, and individual nanoparticles. This could be of interest in the design of stimuli-responsive materials.