Catalysis of Au nano-pyramids formed across the surfaces of ordered Au nano-ring arrays

Cao, Xun; Li, Chaojiang; Lu, Yu; Zhang, Bowei; Wu, Yu; Qing, Liu; Wu, Junsheng; Teng, Jun; Yan, Weiguo; Huang, Yizhong

doi:10.1016/j.jcat.2019.07.038

Cited by 11 publications

(18 citation statements)

References 54 publications

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“…Most gold nanozyme studies reported in the literature are based on AuNPs synthesized using bottom-up approaches due to their low-cost and facile syntheses. However, gold nanostructures exhibiting catalytic properties have also been fabricated through top-down approaches [90][91][92]. Cao et al [90] found that these properties could be improved by fabrication of nanostructured arrays on Au thin film.…”

Section: Catalytic Properties Of Gold Nanoparticlesmentioning

confidence: 99%

“…However, gold nanostructures exhibiting catalytic properties have also been fabricated through top-down approaches [90][91][92]. Cao et al [90] found that these properties could be improved by fabrication of nanostructured arrays on Au thin film. Nanosphere lithography followed by oxygen plasma reactive ion etching (NSL-RIE) was the method used to fabricate ordered Au nanoring arrays, giving rise to Au nanopyramids due to the preferential etching of {111} lattice planes of Au.…”

Section: Catalytic Properties Of Gold Nanoparticlesmentioning

confidence: 99%

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Gold Nanozymes: From Concept to Biomedical Applications

et al. 2020

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In recent years, gold nanoparticles have demonstrated excellent enzyme-mimicking activities which resemble those of peroxidase, oxidase, catalase, superoxide dismutase or reductase. This, merged with their ease of synthesis, tunability, biocompatibility and low cost, makes them excellent candidates when compared with biological enzymes for applications in biomedicine or biochemical analyses. Herein, over 200 research papers have been systematically reviewed to present the recent progress on the fundamentals of gold nanozymes and their potential applications. The review reveals that the morphology and surface chemistry of the nanoparticles play an important role in their catalytic properties, as well as external parameters such as pH or temperature. Yet, real applications often require specific biorecognition elements to be immobilized onto the nanozymes, leading to unexpected positive or negative effects on their activity. Thus, rational design of efficient nanozymes remains a challenge of paramount importance. Different implementation paths have already been explored, including the application of peroxidase-like nanozymes for the development of clinical diagnostics or the regulation of oxidative stress within cells via their catalase and superoxide dismutase activities. The review also indicates that it is essential to understand how external parameters may boost or inhibit each of these activities, as more than one of them could coexist. Likewise, further toxicity studies are required to ensure the applicability of gold nanozymes in vivo. Current challenges and future prospects of gold nanozymes are discussed in this review, whose significance can be anticipated in a diverse range of fields beyond biomedicine, such as food safety, environmental analyses or the chemical industry.

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Section: Catalytic Properties Of Gold Nanoparticlesmentioning

confidence: 99%

Section: Catalytic Properties Of Gold Nanoparticlesmentioning

confidence: 99%

Gold Nanozymes: From Concept to Biomedical Applications

et al. 2020

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“…3(i), in which clusters of bright atomic sites are clearly distinguished by some dark spots and fringes. The surface atoms along the interfaces with the dark fringes, as well as those at the edge of the 3D nanostructures, serve as the atomic-scale active sites [14]; they are all along the <1 1 0> direction, indicating that more energy is stored at these active sites compared to any others that might be formed along the <1 0 0> and <1 1 1> directions [18,19]. The large density of atomic-scale active site allows easier physisorption of ethanol molecules [14] and therefore will perform strong catalysis in EOR under the synergistic effect of the atomic-scale 3D nanostructures.…”

Section: (C) the Strongmentioning

confidence: 99%

“…(1)), instead of breaking up the ethanol molecules into smaller hydrocarbons for further oxidation (reactions (c) and (d) in Eq. (1)) [14,18,26,27]. In contrast, samples with mesh arrays reveal much stronger performance.…”

Section: Catalytic Performance Of the Ma Samplesmentioning

confidence: 99%

“…Producing arrays on electrode surfaces could largely improve the efficiency of Au electrocatalyst. In an earlier work, among some of the common fabrication approaches, lithography was considered to be a fast and efficient method [14]. In view of the rising trends to develop flexible electrodes, nanoimprint lithography (NIL) is a good way to work on them due to the thermoplastic nature of some suitable substrate materials, which is an additional advantage apart from the simplicity, high throughput and high resolution of the NIL process [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Flexible Au micro-array electrode with atomic-scale Au thin film for enhanced ethanol oxidation reaction

Cao

Peng

et al. 2020

Nano Res.

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The catalysis of Au thin film could be improved by fabrication of array structures in large area. In this work, nanoimprint lithography has been developed to fabricate flexible Au micro-array (MA) electrodes with ~ 100% coverage. Advanced electron microscopy characterisations have directly visualised the atomic-scale three-dimensional (3D) nanostructures with a maximum depth of 6 atomic layers. In-situ observation unveils the crystal growth in the form of twinning. High double layer capacitance brings about large number of active sites on the Au thin film and has a logarithmic relationship with mesh grade. Electrochemistry testing shows that the Au MAs perform much better ethanol oxidation reaction than the planar sample; MAs with higher mesh grade have a greater active site utilisation ratio (ASUR), which is important to build electrochemical double layer for efficient charge transfer. Further improvement on ASUR is expected for greater electrocatalytic performance and potential application in direct ethanol fuel cell.

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Bismuth Manganese Catalysts for Soot Oxidation in Diesel Engine Exhaust: Effect of Preparation Methods on Active Oxygen Species

Wang

Dai

et al. 2023

ChemistrySelect

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To manufacture efficient and cost‐effective catalysts for soot combustion, a series of MnxBiOy catalysts with different molar ratios of manganese bismuth (x=1,3,6,9) were prepared by hydrolysis driven redox, coprecipitation and hydrothermal synthesis methods (named R−MnxBiOy, Cop−MnxBiOy and H−MnxBiOy, respectively). The physicochemical properties of the as‐prepared catalysts were characterized via powder X‐ray diffraction (XRD), transmission electron microscope (TEM), temperature‐programmed reduction by hydrogen (H2−TPR), X‐ray photoelectron spectroscopy (XPS), and so on. The catalytic performance results show that R−Mn3BiOy catalyst obtained by hydrolysis‐driven redox method exhibited highest catalytic activity with a maximum concentration of CO2 at 390 °C (T10=330 °C, T50=385 °C, and T90=425 °C). Meanwhile, the reaction mechanism of R−Mn3BiOy catalysts was also proposed based on the characterization results. The reason for high catalytic is related to the uniform distribution of Bi on the surface of Mn, which forms more lattice defects, thereby generating a large number of oxygen vacancies and providing more active sites for catalytic reactions. This provides a reference for the design of efficient and stable soot catalysts.

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Catalysis of Au nano-pyramids formed across the surfaces of ordered Au nano-ring arrays

Cited by 11 publications

References 54 publications

Gold Nanozymes: From Concept to Biomedical Applications

Gold Nanozymes: From Concept to Biomedical Applications

Flexible Au micro-array electrode with atomic-scale Au thin film for enhanced ethanol oxidation reaction

Bismuth Manganese Catalysts for Soot Oxidation in Diesel Engine Exhaust: Effect of Preparation Methods on Active Oxygen Species

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