Preparation and photoelectric properties of Bi2WO6-CdS hybrid nanocrystals

Abstract The poly sodium polyacrylate (PAANa) latex particles containing hybrid nanocrystals of bismuth tungstate-cadmium sulfide (Bi2WO6-CdS) were prepared by the combination process of inverse miniemulsion, absorption, and solvothermal treatment. The Bi2WO6-PAANa latex particles and CdS-PAANa latex particles were prepared by inverse miniemulsion polymerization for formation of CdS based on Bi2WO6 (Bi2WO6/CdS) and Bi2WO6 based on CdS (CdS/Bi2WO6) hybrid nanocrystals, respectively. The effects of dropping strategies in absorption and solvothermal treatment condition on the size, their distribution and morphologies of Bi2WO6/CdS-PAANa and CdS/Bi2WO6-PAANa latex particles were investigated. The dropping in order was better than simultaneous dropping in absorption process. The clustered Bi2WO6/rod-like CdS and punctate CdS/punctate Bi2WO6 hybrid nanocrystals could be grown under the same solvothermal conditions. The influences of cadmium sulfate/sodium sulfide (CdSO4/NaS) millimolar number on the grain size and the morphologies of Bi2WO6/CdS hybrid nanocrystals were investigated. With the CdSO4/NaS millimolar number increase, the grain size of CdS rod-like and Bi2WO6 cluster gradually increased due to oriented attachment and Ostwald ripening, respectively. The Bi2WO6-CdS hybrid nanocrystals will perform the excellent photoelectric properties.