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Growth of PbS Crystals under a BSA Monolayer in the Presence of Kinetically Controlled Ammonia Diffusion

XIONG Hao-Yang,HU Bin-Bin,XUE Zhong-Hui,CAI Li,DAI Shu-Xi,DU Zu-Liang(Key Laboratory for Special Functional Materials of Ministry of Education,Henan University,Kaifeng 475004,China)  
Using a BSA monolayer as organic template,single oriented PbS crystals were prepared at the gas-liquid interface in the presence of kinetically controlled ammonia diffusion to promote hydrolysis of thiacetamide in the precursor solution.The crystals were characterized by means of scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD) and X-ray photoelectron spectroscope(XPS),respectively.The results show that the crystals exhibit a regular square morphology and have a uniform size distribution.The crystals growing along the(200) plane have a single crystalline structure.The electrostatic interaction and the geometrical matching between the BSA molecules and Pb2+ ions are the main reason for the oriented growth along the(200) plane.This method provides a potential approach for growing inorganic crystals with special structural features.
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