Fig. 5.

PA stabilities of GNSs with various thicknesses of silica shells. (a) UV–vis–NIR spectrum of GNSs and silica-coated GNSs with different thicknesses (10 nm, 18 nm, 25 nm, and 30 nm) of silica coating before (solid lines) and after (dot lines) shape change induced by laser irradiation. (b) Number of laser pulse irradiations before shape change occurs for each GNSs sample, including bare GNSs and silica-coated GNSs with different coating thicknesses (i.e., 10 nm, 18 nm, 25 nm, and 30 nm). (c) Infrared thermal images and (d) Temperature increasing curves of GNSs and silica-coated GNSs with different thicknesses (10 nm, 18 nm, 25 nm, and 30 nm) of silica coating.