Effect of amount of cetyltrimethylammonium bromide on morphologies of PbS in microwave synthetic systems

In two microwave synthetic systems,the effect of CTAB on morphologies of PbS materials was studied and preparation of optimal conditions for both star-shaped and flower-like structure were obtained respectively.The results indicated that under the influence of CTAB,the PbS materials with different morphology were obtain.In former system,PbAc2·3H2O was used as lead source,thiourea as sulfur source,DMSO as solvent.With decreasing of the amount of CTAB(0,0.05,0.1g),a star-like structure with smooth surface,nano-dendritic structure and perfect star-like structure were formed sequentially.For latter system in which Pb(NO3)2 as lead source,L-cysteine as sulfur source,deionized water as solvent,a flower-like structure was obtained when CATB was set up 0.05g;without CATB the sheet structure and partial cube were observed;however,when the addition of CTAB is 0.025g,we can not see absolute flower structure but the result showed a tendency to assemble flower structure.Meanwhile,combining experiments and literatures,the formation mechanisms of PbS with star-shaped and flower-like structure were discussed.