Sacrificial Template Synthesis and Photothermal Conversion Enhancements of Hierarchical and Hollow CuInS2 Microspheres

Abstract:Hierarchical and hollow CuInS2 microspheres are synthesized on the basis of sacrificial templates with solid and hollow CuS microspheres as sacrificial templates, respectively. Transformations from CuS solid microspheres to CuInS2 hierarchical microspheres and CuS hollow microspheres to CuInS2 hollow microspheres can be achieved by a solvothermal process at 180 degrees C for 24 h with N,N-dimethylformamide as both solvent and reductant. The products are well characterized, and the formation mechanisms are proposed. The assynthesized products have strong optical absorption from 1000 to 2000 nm in addition to normal absorption from 400 to 800 nm, which has not be reported in the literature. The as-synthesized products exhibit a significant photothermal conversion effect under an irradiation of a 1064 nm laser. At a laser power of 0.05 W.cm(-2), up to 30% and 20% enhancement of photothermal conversion is observed in the aqueous suspension containing 0.1 wt % CuInS2 hollow microspheres and hierarchical microspheres, respectively. The mechanisms for the enhancements of photothermal conversion in the as-synthesized products are also discussed.

Volume:117

Issue:18

Translation or Not:no