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首页> 外文期刊>Nanotechnology >Physico-chemical investigation of ZnS thin-film deposited from ligand-free nanocrystals synthesized by non-hydrolytic thio-sol-gel
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Physico-chemical investigation of ZnS thin-film deposited from ligand-free nanocrystals synthesized by non-hydrolytic thio-sol-gel

机译：由非水解硫溶胶 - 溶胶合成的配体无纳米晶体沉积的ZnS薄膜的物理化学研究

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Ultra-small and monodispersed zinc sulfide nanocrystals (NCs) (d = 3 nm) have been prepared without the use of any surfactants by a synthetic route using benzyl mercaptan as a source of sulfur. The prepared NCs are dispersible in highly polar solvents and display the capability to closely pack-up in a bulky film. The NCs were characterized by TEM, XRD and UV-vis optical absorption as well as by steady-state and time-resolved photoluminescence (PL) spectroscopies. Uniform films of ZnS were spin-coated on glass and ITO-glass substrates using a NCs dispersion in N,N-dimethylformamide. The NCs and the resulting films were characterized by morphological and optoelectronic probing techniques such as AFM, SEM, diffuse reflectance, PL and photoelectron spectroscopy in air. These physical investigations confirmed that the chalcogenide NCs grown by this method have the potential to be utilized directly as photocatalysts and are potentially useful building-blocks/starting materials for the fabrication of semiconductor thin films for optoelectronic applications such as LED, luminescent screens, field effect transistor and solar cells. Insights on the chemistry involved in the NCs growth have been provided revealing that their formation proceeds through a mechanism involving a thioether elimination reaction.
机译：已经制备超小和单分散的硫化锌硫化锌纳米晶体（NCS）（D＆ = 3nm），而不使用任何表面活性剂使用苄基硫醇作为硫的来源。制备的NCS在高极性溶剂中可分散，并显示在庞大的薄膜中紧密包装的能力。 NCS的特征在于TEM，XRD和UV-Vis光学吸收以及通过稳态和时间分离的光致发光（PL）光谱。使用N，N-二甲基甲酰胺中的NCS分散体在玻璃和ITO-玻璃基板上旋涂ZnS的均匀薄膜。通过形态学和光电探测技术，如AFM，SEM，漫反射，PL和光电子光谱在空气中的形态学和光电探测技术的特征表征了NCS和所得薄膜。这些物理调查证实，该方法生长的硫属化物NCs具有直接用作光催化剂的潜力，并且是用于制造用于光电应用的半导体薄膜的潜在有用的构建块/起始材料，例如LED，发光屏幕，场效应晶体管和太阳能电池。已经提供了对NCS增长中涉及的化学的见解，揭示了它们的形成通过涉及硫醚消除反应的机制进行。

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