Complexing Agent Controlled Synthesis of CuInS2 Microcrystals with Hierarchical Architectures

摘要

Three different kinds of hierarchical three-dimensional (3D) copper indium sulfide (CuInS2) microstructures (nanosheet-based rnicroflowers, nanoplatelet-based solid microspheres and nanoflake-based porous microspheres) were synthesized by a facile ethanol solvothermal treatment from CuCl2·2H2O, sodium diethyldithiocarbamate (DDTC-Na), InCl3·4H2O and NH2CSNH2, where DDTC-Na acted as a complexing agent and structure-directing agent. The crystal structure, composition and morphology of the as-prepared products are characterized by X-ray diffraction, energy dispersive X-ray spectrometry, field-emission scanning electron microscopy. The morphology of CuInS2 microcrystals were greatly affected by the concentration of DDTC-Na. When the concentration of DDTC-Na was increased from 0.0125, throgh 0.025-0.05 mol L~(-1), the morphology of CuInS2 could be changed from rnicroflowers, through solid microspheres to porous microspheres. Based on the investigation on the influence of DDTC-Na, the possible mechanism for the formation of CuInS2 microstructures is simply discussed.