Synthesis of Cu₂O@Ag Polyhedral Core–Shell Nanoparticles by a Thermal Decomposition Approach for Catalytic Applications

Abstract

Cu 2 O@Ag polyhedral core-shell nanoparticles with different morphologies (rhombicuboctahedral, cuboctahedral, truncated octahedral, and octahedral) have been successfully synthesized by a thermal decomposition approach. The Cu 2 O@Ag polyhedral core-shell nanoparticles were characterized by X-ray diffraction, electron microscopy, surface-area analysis, and diffuse reflectance spectroscopy. The XRD results confirm the presence of Cu 2 O and silver in the Cu 2 O@Ag samples. Electron microscopy studies prove the formation of a shell of silver nanoparticles on the polyhedral Cu 2 O microcrystals. The diffuse reflectance spectra of the Cu 2 O@Ag polyhedral coreshell nanoparticles show band-gap absorption owing to Cu 2 O as well as surface plasmon resonance owing to silver nanoparti- [a]

Solid‐State Synthesis of Silver Nanoparticles and Their Catalytic Application in Methylene Blue Reduction

“…So, for the catalyzed reaction, the first step is presumably NaBH 4 adsorption on the surface of hybrid Ag‐MB NPs, which is a slower process, and the second is MB reduction with NaBH 4 , a faster process. A similar reaction mechanism was proposed for Cu2O@Ag polyhedral core‐shell nanoparticles . The role of Ag NPs is to accelerate electron transfer.…”

“…According to literature studies, the NPs catalytic reduction of MB generally follows the first‐order kinetics or pseudo‐first‐order kinetics . However, in our studies, the kinetics of the catalyzed reaction has a sigmoid shape curve, which indicates a two‐step process, two consecutive first‐order reactions, respectively.…”

“…Also, it was found that the reduction of MB in the presence of technetium as a catalyst, follows the first‐order reaction through intermediate complex . The study also shows that reduction of MB, in the presence of metal NPs as a catalyst, follows pseudo‐first‐order reaction kinetics …”

“…Besides metal NPs, ultra‐layered sheet Cu−Co NPs have been shown as an excellent catalyst in the reduction process . Recently, some core‐shell NPs, with Ag NPs as a shell, was reported as an efficient catalyst in redox reactions . There are various synthetic methods (chemical reduction, laser ablation, etc.)…”

Self-Assembled Ag-Cu2O Nanocomposite Films at Air-Liquid Interfaces for Surface-Enhanced Raman Scattering and Electrochemical Detection of H2O2

“…Sliver (Ag), a relatively cheap noble metal, has been widely utilized for the synthesis of Ag nanoparticles, nanorods, and nanowires for various applications [ 14 , 15 , 16 ]. Cu 2 O is a low-cost, environment-friendly p -type semiconductor with a narrow band gap (2.17 eV) [ 17 ], and therefore Cu 2 O-based materials have been used widely in catalysis, sensors, solar cells, lithium-ion batteries, and water splitting [ 11 , 18 , 19 , 20 , 21 ]. Especially, the combination of Ag with Cu 2 O has attracted strong attentions and a lot of synthesis methods of Ag-Cu 2 O nanocomposites for different applications have been reported [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ].…”