Enhanced catalyst activity by decorating of Au on Ag@Cu2O nanoshell

Zhong, Hua; Liu, Maomao; Zhao, Yue; Kou, Qiangwei; Wang, Yaxin; Liu, Yang; Zhang, Yongjun; Yang, Jing; Jung, Young Mee

doi:10.1016/j.apsusc.2017.11.082

Cited by 43 publications

(22 citation statements)

References 34 publications

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“…Cu 2p spectrum of AC-1 NCs exhibits two contributions assigned to Cu2O instead of Cu (0) or Cu (II) [49,50], which are Cu 2p3/2 and Cu 2p1/2 at 931.1 and 951.1 eV, respectively [51,52]. The peak positions of Cu 2p3/2 and Cu 2p1/2 slightly shift towards the higher binding energy side with the decrease of Cu2O thickness owing to the variation in the chemical environment, which demonstrates an interaction between Au and Cu2O [47]. In addition, because the XPS spectra intensity is directly proportional to the concentration of atoms, the binding energy intensity of Cu 2p decreases when the Cu2O thickness on the surfaces of Au decreases.…”

Section: Resultsmentioning

confidence: 95%

“…A possible explanation is that Cu 2 O shells have larger refractive index compared to that of the solvent [26]. Apart from the SPR peak, it is found that there is a blueshift in the wavelength centered at 406-432 nm for Au@Cu 2 O NCs compared with the absorption peak of pure Cu 2 O nanocrystals due to the interband transition in Cu 2 O and the scattering of Cu 2 O shells [47]. It is worth emphasizing that the absorption peak of AC-9 NCs and AC-11 NCs resulting from Cu 2 O shells is almost invisible because the Cu 2 O shells are not formed on the surfaces of these two samples.…”

Section: Resultsmentioning

confidence: 97%

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

Kou

Zheng

et al. 2019

Nanomaterials

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Au@Cu2O core-shell nanocomposites (NCs) were synthesized by reducing copper nitrate on Au colloids with hydrazine. The thickness of the Cu2O shells could be varied by adjusting the molar ratios of Au: Cu. The results showed that the thickness of Cu2O shells played a crucial role in the catalytic activity of Au@Cu2O NCs under dark condition. The Au@Cu2O-Ag ternary NCs were further prepared by a simple galvanic replacement reaction method. Moreover, the surface features were revealed by TEM, XRD, XPS, and UV–Vis techniques. Compared with Au@Cu2O NCs, the ternary Au@Cu2O-Ag NCs had an excellent catalytic performance. The degradation of methyl orange (MO) catalyzed by Au@Cu2O-Ag NCs was achieved within 4 min. The mechanism study proved that the synergistic effects of Au@Cu2O-Ag NCs and sodium borohydride facilitated the degradation of MO. Hence, the designed Au@Cu2O-Ag NCs with high catalytic efficiency and good stability are expected to be the ideal environmental nanocatalysts for the degradation of dye pollutants in wastewater.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 97%

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

Kou

Zheng

et al. 2019

Nanomaterials

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“…To get the Ag@Cu 2 O-rGO structure, our previous synthesis method of Ag@Cu 2 O core-shell structure was improved [ 28 ]. The specific method is as follows: 50 mL of 8 mM Cu(NO 3 ) 2 solution was poured into a beaker.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2018

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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.

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“…Cu 2 O nanoparticles have the advantages of remarkable catalytic activity, diverse morphology, good biocompatibility and low cost, which have been widely used in sensors, catalysis and solar cells [25,26]. Therefore, we choose Ag nanoparticles and Cu 2 O nanoparticles to prepare Cu 2 O@Ag nanocomposites, which are widely concerned because they are superior to these two individual metal nanoparticles in terms of stability and activity [27][28][29][30][31]. The purpose of this paper is to explore the catalytic properties of Cu 2 O@Ag nanocomposites, especially the application prospects in the H 2 O 2 catalytic system.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric Detection of Uric Acid with High Sensitivity Using Cu2O@Ag Nanocomposites

Wang

Tang

et al. 2020

Chemistry Africa

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In this paper, we built the Cu 2 O@Ag nanocomposites-catalyzed 3,3′,5,5′-tetramethylbenzidine (TMB)-H 2 O 2 system for sensitive, rapid, and low-cost colorimetric sensing of uric acid (UA). Firstly, Ag nanotriangles were synthesized by dynamic method, and then Cu 2 O was encapsulated on the nanoflakes to synthesize Cu 2 O@Ag nanocomposites. Characterization of the structure and morphology of nanocomposites material were characterized by transmission electron microscopy, X-ray energy-dispersive spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Cu 2 O@Ag nanocomposites could catalyze the oxidation of TMB by H 2 O 2 (which is produced by enzymatic oxidation of UA), and the color changes from colorless to blue can be observed directly with the naked eyes or can be detected by UV-Vis spectrophotometer. The colorimetric sensor provided a linear absorbance response in the 0.5-100 μM UA concentration range with a 0.4 μM detection limit (S/N = 3). The recovery of UA in human serum by the proposed sensor is over 95.7%. Thus, these results imply that the UA sensor provides an effective tool in fast clinical analysis of gout without the need for expensive and advanced equipment.

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Enhanced catalyst activity by decorating of Au on Ag@Cu2O nanoshell

Cited by 43 publications

References 34 publications

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

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

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

Colorimetric Detection of Uric Acid with High Sensitivity Using Cu2O@Ag Nanocomposites

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