In Situ Synthesis of Ag@Cu2O-rGO Architecture for Strong Light-Matter Interactions

Abstract

Emerging opportunities based on two-dimensional (2D) layered structures can utilize a variety of complex geometric architectures. Herein, we report the synthesis and properties of a 2D+0D unique ternary platform-core-shell nanostructure, termed Ag@Cu2O-rGO, where the reduced graphene oxide (rGO) 2D acting as a platform is uniformly decorated by Ag@Cu2O core-shell nanoparticles. Cu2O nanoparticles occupy the defect positions on the surface of the rGO platform and restore the conjugation of the rGO structure, which contributes to the significant decrease of the ID/IG intensity ratio. The rGO platform can not only bridge the isolated nanoparticles together but also can quickly transfer the free electrons arising from the Ag core to the Cu2O shell to improve the utilization efficiency of photogenerated electrons, as is verified by high efficient photocatalytic activity of Methyl Orange (MO). The multi-interface coupling of the Ag@Cu2O-rGO platform-core-shell nanostructure leads to the decrease of the bandgap with an increase of the Cu2O shell thickness, which broadens the absorption range of the visible light spectrum.

A Novel Au@Cu2O-Ag Ternary Nanocomposite with Highly Efficient Catalytic Performance: Towards Rapid Reduction of Methyl Orange Under Dark Condition

“…It is unfortunate that ZnO and TiO 2 semiconductors can only absorb and transport photons in the UV region of the solar spectrum [31]. In contrast, p-type Cu 2 O has an excellent visible light response [32,33]. A great deal of research so far has been done to improve the photocatalytic efficiencies of Au@Cu 2 O in the last few years [34].…”

Enhanced Surface-Enhanced Raman Scattering Activity of MoS2–Ag-Reduced Graphene Oxide: Structure-Mediated Excitonic Transition

“…We found that there were other forms of oxygen in addition to the adsorbed oxygen and water vapor in the processing system, mainly due to the introduction of oxygen-containing functional groups onto the surface of rGO . The XPS spectrum in Figure S1 clearly shows that Ag 3d peaks at 366.87 (Ag 3d 5/2 ) and 372.88 eV (Ag 3d 3/2 ) were also observed …”

“…First, graphene oxide (GO) nanosheets were obtained by a two-step oxide graphite powder oxidation method based on the Hummers and Offeman method . Then, the improved Lee and Meisel method was used to achieve GO surface modification with Ag nanoparticles (Ag NPs) . The detailed operation was as follows: First, 1 mg of as-prepared GO nanosheets was mixed with 30 mL of deionized water, and the above mixed solution was sonicated to obtain a GO solution with great dispersion.…”

“…18 Then, the improved Lee and Meisel method was used to achieve GO surface modification with Ag nanoparticles (Ag NPs). 19 The detailed operation was as follows: First, 1 mg of as-prepared GO nanosheets was mixed with 30 mL of deionized water, and the above mixed solution was sonicated to obtain a GO solution with great dispersion. After that, this GO solution and 170 mL of deionized water were added to a three-necked flask, and 4 mL of 1 wt % sodium citrate dihydrate solution was selected as a reducing agent to reduce 36 mg of AgNO 3 to Ag NPs on the surface of GO using heat preservation (85 °C, 15 min) and heating (90 °C, 40 min) processes in the threenecked flask.…”

Catalysis of Organic Pollutants Abatement Based on Pt-Decorated Ag@Cu2O Heterostructures

“…Cu 2 O has excellent optical and electrical properties that have attracted the attention of scientists [25]. Trinitrophenol (TNP), an explosive pollutant, is distributed widely in soil and water.…”