Ternary and quaternary nanocrystals(e.g.,CuInS2,CuInSe2,CuInGaS2,CuInZnS2,CuZnSnS4),with tunable bandgaps,environmental friendly elements as well as low cost,have been receiving great interest for light-emitting and solar-harvesting applications [1,2].One-pot synthesis methods of these nanocrystals often leads to poor stoichiometric control and the formation of intermediate products [3].To overcome this drawback,we herein report the synthesis of CuInS2 nanocrystals with tunable morphology,chemical compositions and bandgaps through incorporation of Cu+ions into In2S3 nanoplate templates.The shape of the resulting CuInS2 nanocrystals can be tailored from larger nanoplates to small nanodots by tuning the incorporation temperatures,and the chemical composition can be controlled by the amount of copper ions in the reaction mixture.As a result,bandgaps of CuInS2 nanoplates can be tuned from 1.45 to 1.19 eV with Cu/In molar ratios increasing from 0.72 to 2.89,which was demonstrated by cyclic voltammetry.Furthermore,we have used this template-synthesis method to produce quaternary CuInZnS2 nanocrystals with red emission through injection of both Cu and Zn precursors into a solution of In2S3 nanoplates at high temperature.We have developed a facile template-based method for the synthesis of ternary CuInS2 and quaternary CuInZnS2 semiconducting NCs from binary In2S3 nanoplates.The synthesis process contain two simple,hassle-free steps i.e.,the fabrication for the starting template In2S3 nanoplates and following incorporation Cu+into the template for alloying.Luminescent quaternary CuInZnS2 NCs were synthesized through co-incorporation Cu+and Zn2+into In2S3 nanopaltes,providing a new method to fabricate non-toxic luminescent nanocrystals.