Microwave-assisted synthesis of Au/CdS nanorods for a visible-light responsive photocatalyst

Abstract

In this work, cadmium sulfide (CdS) is used as a visible-light responsive photocatalyst with a narrow band gap (2.42 eV). CdS nanorods were synthesized by a facile and rapid microwave-assisted method and Au dots were decorated on the surface by a reduction method. The additions of the Au dots hinder the recombination of electron-hole pairs and enhance the photocatalytic activity under visible light. The photocatalytic activity of the Au/CdS nanorods was evaluated by the photodegradation of methylene blue (MB) under visible light irradiation (455 nm LED lamp). The photocatalytic efficiency of Au/CdS nanorods is compared to conventional TiO 2 (P25) and CdS-A prepared by an autoclave method, and an improvement of the Au/CdS system, attributed to the reduced band gap energy (2.31 eV) and enhanced absorption in the range of 400 to 800 nm, was observed. The calculated mineralization ratio of MB by Au/CdS nanorods was higher compared to the data presented in the literature. This facile and efficient synthesis route may promote the utilization of Au/CdS nanorods as visible light photocatalysts. Experimental section Microwave-assisted synthesis of CdS nanorodAll source materials purchased from Sigma-Aldrich were of analytical grade and utilized as-received without further

Synthesis of Ultra‐Small Palladium Nanoparticles Deposited on CdS Nanorods by Pulsed Laser Ablation in Liquid: Role of Metal Nanocrystal Size in the Photocatalytic Hydrogen Production

“…This result can be explained by the fact that the Pd and PdPt nanoparticles serve as sink sites for the photogenerated electrons, which, in turn, prevent electron/hole recombination processes under light irradiation. [54] The increased light-harvesting capability in the visible-light range is relatedt ot he Pd and PdPt nanoparticles incorporated into the CdS nanorods and decreased light reflection by the noble-metaln anoparticles loaded on the bare CdS. [55] The above results indicate that the nanocomposites utilize solar light more effectively,w hich results in higher activity compared with bare CdS for the photocatalytic evolution of hydrogen.…”

“…However, the CdS‐Pd and CdS‐PdPt nanocomposites exhibit higher absorbance than bare CdS in the visible‐light range from 500 to 800 nm. This result can be explained by the fact that the Pd and PdPt nanoparticles serve as sink sites for the photogenerated electrons, which, in turn, prevent electron/hole recombination processes under light irradiation . The increased light‐harvesting capability in the visible‐light range is related to the Pd and PdPt nanoparticles incorporated into the CdS nanorods and decreased light reflection by the noble‐metal nanoparticles loaded on the bare CdS .…”

Surface Plasmon Resonance or Biocompatibility—Key Properties for Determining the Applicability of Noble Metal Nanoparticles

“…The role of Au in this case is very similar to the role of GO and G mentioned earlier, providing electron transfer assistance [ 150 ]. If the classical approach was used, then CdS acts as the visible light active photocatalyst, while Au is the electron transfer end-point [ 160 ].…”

Cadmium Sulfide Nanoparticles Decorated with Au Quantum Dots as Ultrasensitive Photoelectrochemical Sensor for Selective Detection of Copper(II) Ions

“…In Fig. 1D, the sharp and strong diffraction of the XRD peaks exhibit high-quality crystallization 35 equation" [39][40][41][42] . This Haiss equation (Eqn.…”

“…Moreover, the TEM image (Figure1C) highlights the lattice fringes present on the NPs, with a distance of 0.327 nm, and on the QDs, with a distance of 0.373 nm, which agree well with the d-spacing of the hexagonal wurtzite CdS (101) and plane-cubic Au (200) crystallographic planes, respectively.In addition, the crystalline properties and phase structures of the products were further analyzed and investigated using XRD. In Figure1D, the sharp and strong diffraction of the XRD peaks exhibit high-quality crystallization 35. Comparing these three diffraction peaks, the crystallinity of the CdS NPs and Au QDs show similar or sharper peaks than the CdS-Au nanostructures.…”