HAADF-STEM micrograph of the as-synthesized Ag S dots. Scale bar is 10 nm. High-resolution STEM of as-synthetized dots showing lattice fringes d and d of cubic Ag and monoclinic Ag S, respectively. 2D EDS mapping of the spatial distribution of Ag ( ), S ( ), and Ag+S ( ). Magnified STEM micrograph of two Ag S dots. Net X-ray intensity profiles extracted from the green arrow marked in . Note how the Ag/S ratio increases at the edges of the dots, which coincides with the electro-dense area. The inset shows a model Ag S dot. HAADF-STEM micrograph of Ag S dots after ultrafast laser irradiation with 50 fs laser pulses for 90 min at a power density of 9 W cm . Scale bar is 10 nm. High-resolution STEM of an ultrafast laser-irradiated Ag S dot showing lattice fringes d and d of cubic Ag and monoclinic Ag S, respectively. Note the presence of a shell marked with a blue bracket around the nanoparticle. 2D EDS mapping of the spatial distribution of Ag ( ), S ( ), Cl ( ), and Ag+S + Cl ( ) of an ultrafast laser-irradiated Ag S dot. Magnified STEM micrograph of an ultrafast laser-irradiated Ag S dot. Net X-ray intensity profiles extracted from the green arrow marked in image ( ), where we can observe the presence of Ag, S, and Cl. The inset in shows a schematic representation of a single Ag S dot after ultrafast laser irradiation.
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