Semiconductor PbS single-crystal nanosheets with micrometer-scale lateral dimensions have been synthesized on a large scale by hydrothermal decomposition of the lamellar precursor-Pb(Ⅱ)-thiourea complexes at a low temperature of 130 ℃ for 12 h. XRD, TEM, SEM, electron diffraction (ED) and XPS were used to characterize the final product. The products are sheet-like with rectangle lateral dimensions in the range of 0.6～3 μm and thickness of 2～4 nm which grow along the a and b axes two-dimensional (2D) direction simultaneously.UV-Vis absorption and Photoluminescence (PL) spectra reveal that the as-prepared products have shown considerably greater quantum size effects expected for the 2D ultrathin nanostructure. The possible formation mechanism has been proposed.%以层状的铅(Ⅱ)-硫脲配合物为前驱体,在130 ℃反应12 h水热分解得到高产量的半导体单晶PbS二维纳米片,产品用XRD、TEM、SEM、ED、XPS进行了表征,单晶PbS纳米片的二维尺寸为0.6～3 μm,厚度为2～4 nm,沿着ab平面生长.紫外吸收光谱和光致发光光谱表明二维PbS纳米片的量子尺寸效应非常显著.对可能的生长机理进行了探讨.
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