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Two-dimensional single crystal CdS nanosheets: Synthesis and properties

机译：二维单晶CdS纳米片的合成与性能

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摘要

A one-dimensional (1D) to two-dimensional (2D) topotactic transformation has been proposed for the synthesis of 2D CdS nanosheets by promoting the lateral growth of 1D CdS nanobelts. The as-prepared nanosheets are single crystal with hexagonal structure, usually 20-100 nm in thickness, 20-100 μm in width, and up to several millimeters in length. CdS nanosheets show enhanced multiphonon responses and exciton-phonon couplings, which are correlated to their extraordinary anisotropic geometry. Photoluminescence measurement reveals three emission bands at about 1.61, 2.39, and 2.45 eV, which are attributed to the radiative transitions related to surface states, bandgap, and excitonic molecules, respectively; moreover, the formation of the surface states and the excitonic molecules are significantly enhanced due to the anisotropic geometry of the 2D nanosheets. CdS nanosheets show also pronounced photoconduction under visible light irradiation, indicating potentials in assembly of optoelectronic nanodevices.
机译：已经提出了通过促进一维CdS纳米带的横向生长来合成一维CdS纳米片的一维（1D）到二维（2D）全能变换。所制备的纳米片是具有六边形结构的单晶，通常厚度为20-100 nm，宽度为20-100μm，长度可达几毫米。 CdS纳米片显示出增强的多声子响应和激子-声子耦合，这与其异常的各向异性几何结构相关。光致发光测量揭示了三个发射带，分别位于约1.61、2.39和2.45 eV，这分别归因于与表面态，带隙和激子分子有关的辐射跃迁。此外，由于2D纳米片的各向异性几何形状，表面态和激子分子的形成显着增强。 CdS纳米片在可见光照射下也显示出明显的光电导性，表明光电纳米器件组装的潜力。

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