Controlled UV−C Light-Induced Fusion of Thiol-Passivated Gold Nanoparticles Salvador Pocoví-Martínez Miriam Parreño-Romero Said Agouram Julia Pérez-Prieto 10.1021/la2000443.s001 https://acs.figshare.com/articles/journal_contribution/Controlled_UV_C_Light_Induced_Fusion_of_Thiol_Passivated_Gold_Nanoparticles/2657611 Thiol-passivated gold nanoparticles (AuNPs) of a relatively small size, either decorated with chromophoric groups, such as a phthalimide (<b>Au@PH</b>) and benzophenone (<b>Au@BP</b>), or capped with octadecanethiol (<b>Au@ODCN</b>) have been synthesized and characterized by NMR and UV−vis spectroscopy as well as transmission electron microspcopy (TEM). These NPs were irradiated in chloroform at different UV-wavelengths using either a nanosecond laser (266 and 355 nm, ca. 12 mJ/pulse, 10 ns pulse) or conventional lamps (300 nm < λ < 400 nm and ca. 240 nm < λ < 280 nm) and the new AuNPs were characterized by X-ray and UV−vis spectroscopy, as well as by TEM. Laser irradiation at 355 nm led to NP aggregation and precipitation, while the NPs were photostable under UV-A lamp illumination. Remarkably, laser excitation at 266 nm induced a fast (minutes time-scale) increase in the size of the NPs, producing huge spherical nanocrystals, while lamp-irradiation at UV-C wavelengths brought about nanonetworks of partially fused NPs with a larger diameter than the native NPs. 2011-05-03 00:00:00 355 nm TEM laser NP transmission electron microspcopy NMR UV