A simple solution route to controlled synthesis of ZnS submicrospheres, nanosheets and nanorods

Abstract

ZnS nanostructures with different morphologies of submicrospheres, nanosheets and nanorods were synthesized by solution precipitation of thiourea with Zn(NO3)2 in the presence of block copolymer at low temperature. The sizes and morphologies of ZnS can be controlled simply bychanging the processing parameters. The results show that the ZnS submicrospheres are of 250-500nm in diameter, nanosheets are 2.5νm × 5.5νm with an estimated thickness of 20-30nm, and nanorods are 2-5nm in diameter and 10-30nm in length. Keeping the precursor system in an autoclave at 105 °C results in the formation of ZnS submicrospheres; ultrasonication and keeping the system at room temperature leads to the formation of ZnS nanosheets; and long-time continuous ultrasonication and keeping the system in an autoclave at 105 °C induces the formation of uniform ZnS nanorods. We argue that the reaction temperature and P123 may play crucial roles in the formation of three ZnS structures in this work. The morphologically controllable synthesis strategies may be extended to the shape-controlled production of nanostructures of other inorganic materials. © 2006 IOP Publishing Ltd.