Alhammadi Salh, Minnam Reddy Vasudeva Reddy, Gedi Sreedevi, Park Hyeonwook, Sayed Mostafa Saad, Shim Jae-Jin, Kim Woo Kyoung
School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea.
Nanomaterials (Basel). 2020 Jan 30;10(2):245. doi: 10.3390/nano10020245.
A graphene-cadmium sulfide (Gr-CdS) nanocomposite was prepared by a chemical solution method, and its material properties were characterized by several analysis techniques. The synthesized pure CdS nanoparticles (NPs) and Gr-CdS nanocomposites were confirmed to have a stoichiometric atomic ratio (Cd/S = 1:1). The Cd 3d and S 2p peaks of the Gr-CdS nanocomposite appeared at lower binding energies compared to those of the pure CdS NPs according to X-ray photoelectron spectroscopy analyses. The formation of the Gr-CdS nanocomposite was also evidenced by the structural analysis using Raman spectroscopy and X-ray diffraction. Transmission electron microscopy confirmed that CdS NPs were uniformly distributed on the graphene sheets. The absorption spectra of both the Gr-CdS nanocomposite and pure CdS NPs thin films showed an absorption edge at 550 nm related to the energy band gap of CdS (~2.42 eV). The Cu(In,Ga)Se thin film photovoltaic device with Gr-CdS nanocomposite buffer layer showed a higher electrical conversion efficiency than that with pure CdS NPs thin film buffer layer. In addition, the water splitting efficiency of the Gr-CdS nanocomposite was almost three times higher than that of pure CdS NPs.
采用化学溶液法制备了一种石墨烯-硫化镉（Gr-CdS）纳米复合材料，并用多种分析技术对其材料性能进行了表征。经证实，合成的纯硫化镉纳米颗粒（NPs）和Gr-CdS纳米复合材料具有化学计量原子比（Cd/S = 1:1）。根据X射线光电子能谱分析，Gr-CdS纳米复合材料的Cd 3d和S 2p峰出现在比纯CdS NPs更低的结合能处。拉曼光谱和X射线衍射的结构分析也证实了Gr-CdS纳米复合材料的形成。透射电子显微镜证实CdS NPs均匀分布在石墨烯片上。Gr-CdS纳米复合材料和纯CdS NPs薄膜的吸收光谱在550 nm处均显示出与CdS（~2.42 eV）能带隙相关的吸收边。具有Gr-CdS纳米复合材料缓冲层的铜铟镓硒（Cu(In,Ga)Se）薄膜光伏器件的光电转换效率高于具有纯CdS NPs薄膜缓冲层的器件。此外，Gr-CdS纳米复合材料的水分解效率几乎是纯CdS NPs的三倍。
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