Enhanced optical and photocatalytic properties of Ag NPs decorated-ZnO composites

2024-12-25T13:21:57+07:00

The goal of this work is to synthesize and study composites of silver and zinc oxide nanoparticles for improved ZnO light absorption by the aggregation of Ag nanoparticles prepared by a simple process. Starting with the synthesis of silver nanoparticles from silver nitrate (Silver Nitrate; AgNO3 ), the concentration of the synthesis of silver nanoparticles and zinc oxide composites was changed to 0.2%, 0.6%, and 1.0%. Initially, the amount of silver nanoparticles of 0.2%, 0.6%, and 1.0 % per 3 g of zinc oxide was carried out to determine the amount of silver nanoparticles suitable for important properties. Morphological analysis was performed using scanning electron microscopy (SEM). The crystal structure was analyzed by X-ray diffraction. The study on absorbance using the diffuse reflectance UVvisible spectroscopy technique and the photocatalytic efficiency was assessed by the decomposition of organic dyes under visible light. The analysis revealed that the silver nanoparticles and zinc oxide composites were morphologically cuboid and rod-shaped. As for the crystal structure, it was found to be hexagonal. The absorbance of composite materials is lower than that of pure zinc oxide in the 405600 nm range. Silver nanoparticles will enhance light absorption in composite materials due to their favorable surface plasmon resonance characteristics. This enhances composite materials' optical absorption. The breakdown of organic dyes under visible light was used to measure the photocatalytic efficiency, and it was discovered that the best photocatalytic properties were obtained with Ag NPs 0.2% per 3 g of ZnO.

Physical and Optical Properties of Al/Yb-dually incorporated CuS Particles Prepared by Facile Co-precipitation Process

2024-12-22T09:49:53+07:00

Energy saving and management is considered as important aspects requiring relevant research and technological knowledge. Near infrared (NIR) shielding is an effective technology to reduce the energy consumption in the building that requires appropriate materials for specific shielding wavelengths. Copper (II) sulfide (CuS) is considered as an interesting p-type semiconductive material with good NIR shielding character and its optical property can be further enhanced by incorporation with proper dopants. This work reports on the facile synthesis of CuS particle via co-precipitation method. The influence of Al and Yb ions as the potential dopants on structural and optical properties are investigated by X-ray diffraction technique, field-emission scanning electron microscope, energy dispersive x-ray spectroscopy, and UV-VIS-NIR spectroscopy. Both Al and Yb dopants play significant roles on the modification of both physical and optical properties, especially in NIR spectra region. CuS with certain Al and Yb doping contents results in and considerable improvement in NIR shielding performance.

Thai Journal of Nanoscience and Nanotechnology

Enhanced optical and photocatalytic properties of Ag NPs decorated-ZnO composites

Physical and Optical Properties of Al/Yb-dually incorporated CuS Particles Prepared by Facile Co-precipitation Process