Torres-Duarte Angel Roberto, Pineda-Leon Horacio AntolĂ N, Aned De Leon, Ochoa-LandĂ N RamĂłn, Castillo Santos JesĂşs
Acta Chim Slov. 2020 Dec;67(4):1196-1201.
This work focused on comparing cadmium sulphide (CdS) thin films with and without CdS silver aggregates (CdS:Ag) deposited on the surface. We report absorption and transmission responses. Using the Tauc method, we obtained direct band gap energies with values of 2.50 (CdS) and 2.49 eV (CdS:Ag). We performed a scanning electron microscope characterization at different magnifications were cluster formations with granular shapes were observed. The highest magnification of 50,000× showed silver clusters as shiny granulates, which were confirmed by microprobe elemental mapping at a magnification of 18,000×. Energy Dispersive Spectroscopy revealed that the light composition of the silver clusters was the unique difference from the CdS thin film. X-Ray Diffraction results only detected the hexagonal CdS pattern, but not that of silver. The crystallite size was of around 13 nm. A Surface-Enhanced Ramman Scattering effect was observed upon the silver coating of the CdS thin film at 293.3 cm-1.
这项工作聚焦于比较表面沉积有和没有硫化镉银聚集体（CdS:Ag）的硫化镉（CdS）薄膜。我们报告了吸收和透射响应。使用陶克方法，我们获得了直接带隙能量，CdS的值为2.50 eV，CdS:Ag的值为2.49 eV。我们在不同放大倍数下进行了扫描电子显微镜表征，观察到了颗粒状的团簇结构。50000倍的最高放大倍数显示银团簇为闪亮的颗粒，这在18000倍的微探针元素映射中得到了证实。能量色散光谱显示银团簇的轻元素组成是与CdS薄膜的唯一差异。X射线衍射结果仅检测到六方CdS图案，未检测到银的图案。微晶尺寸约为13纳米。在293.3 cm-1处对CdS薄膜进行银涂层时观察到了表面增强拉曼散射效应。
