Arjun Kumar B, Elangovan Thangavel, Karthigaimuthu Dharmalingam, Aravinth D, Ramalingam Gopal, Ran Fen, Sangaraju Sambasivam
Quantum Materials Research Lab (QMRL), Department of Nanoscience and Technology, Alagappa University, Karaikudi 630003, Tamil Nadu, India.
Department of Energy Science, Periyar University, Salem 636011, Tamil Nadu, India.
Langmuir. 2023 Nov 14;39(45):15864-15877. doi: 10.1021/acs.langmuir.3c01428. Epub 2023 Nov 4.
Herein, we synthesized a CdSe quantum dots (QDs)-decorated ternary metal oxide nanocomposite of ZnO/TiO/CuO through a simple hydrothermal method. The prepared nanocomposite exhibited monoclinic, hexagonal, and cubic phase structures in XRD (X-ray diffraction) analysis. UV-vis absorbance spectra showed the broad absorption spectrum. SEM (scanning electron microscopy) clearly showed the presence of nanoparticles and confirmed the elements through elemental mapping. TEM (transmission electron microscopy) confirmed the nanostructure of metal oxides decorated with QDs. The average particle size was 45 nm for metal oxides and 7 nm for QDs. XPS (X-ray photoelectron spectroscopy) also confirmed the surface elemental composition. The prepared nanocomposites were introduced as photoanodes in DSSCs (dye-sensitized solar cells) and as photocatalysts for industrial dye solution. Among these samples, CdSe@CuO/TiO/ZnO showed an improved performance of PCE (photon conversion efficiency) of 3.68% in DSSC and 96% photocatalytic degradation efficiency. It showed a recycling efficiency of ∼92% after 4 cycles against methylene blue (MB) organic dye under visible light irradiation.
在此，我们通过一种简单的水热法合成了一种CdSe量子点（QDs）修饰的ZnO/TiO/CuO三元金属氧化物纳米复合材料。在X射线衍射（XRD）分析中，制备的纳米复合材料呈现出单斜、六方和立方相结构。紫外可见吸收光谱显示出宽吸收光谱。扫描电子显微镜（SEM）清晰地显示了纳米颗粒的存在，并通过元素映射确认了元素。透射电子显微镜（TEM）证实了用QDs修饰的金属氧化物的纳米结构。金属氧化物的平均粒径为45 nm，QDs的平均粒径为7 nm。X射线光电子能谱（XPS）也证实了表面元素组成。制备的纳米复合材料被用作染料敏化太阳能电池（DSSCs）中的光阳极以及工业染料溶液的光催化剂。在这些样品中，CdSe@CuO/TiO/ZnO在染料敏化太阳能电池中显示出3.68%的光子转换效率（PCE）的改进性能，在光催化降解中显示出96%的效率。在可见光照射下，针对亚甲基蓝（MB）有机染料，经过4个循环后，它显示出约92%的循环效率。
