Add time:09/07/2019 Source:sciencedirect.com
Copper Sulphide nanoparticles (CuS0) were synthesized by reacting copper acetate with thiourea in oil-in-water microemulsions under high temperature conditions (80 °C). The prepared nanostructures were characterized using UV–vis spectroscopy, SEM, TEM, Raman, EDAX for their size, morphology, behavior and structure. These copper sulphide nanoparticles stabilized with Pluronic F-127 were found to be spherical in shape with broad absorption spectrum in NIR region possessing λmax at 922 nm. The average diameter of the nanoparticles determined by TEM was 18 nm. The prepared particles were irradiated by using laser of 808 nm (NIR region) for 10 min (CuS10), 20 min (CuS20) and 30 min (CuS30) to investigate its effect on morphology and behavior. The changes had been studied by TEM, SEM, XRD, FT-IR, Raman and by observing the shifts in UV absorption spectrum. Upon exposure to laser radiation, the monodispersed nanoparticles were found to assemble like flowers, small rods and long extended rods. Photothermal efficiency keeps on decreasing with irradiation time. The nanoparticles were found to be amorphous initially which became crystalline, upon irradiation with laser light after 30 min. The possible criteria or mechanism involved in the formation of different nanostructures has also been discussed.
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