Single-Crystalline Octahedral Au–Ag Nanoframes

Hong, Xun; Wang, Dingsheng; Cai, Shuangfei; Rong, Hongpan; Li, Yadong

doi:10.1021/ja3076132

Cited by 207 publications

(193 citation statements)

References 23 publications

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“…Similarly, Ag nanowires have been widely exploited as templates for the preparation of hollow nanotubes via the GRR [86,97,[100][101][102][103][104]. Other structures commonly obtained through the GRR between HAuCl 4 and the corresponding Ag template include nanorings [105,106], nanoframes [107][108][109], and nanorattles [110][111][112][113][114]. A set of hollow AuAg nanostructures are shown in Figure 3.…”

Section: Synthesis Of Hollow Nanostructuresmentioning

confidence: 99%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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Metallic nanostructures have received great attention due to their ability to generate surface plasmon resonances, which are collective oscillations of conduction electrons of a material excited by an electromagnetic wave. Plasmonic metal nanostructures are able to localize and manipulate the light at the nanoscale and, therefore, are attractive building blocks for various emerging applications. In particular, hollow nanostructures are promising plasmonic materials as cavities are known to have better plasmonic properties than their solid counterparts thanks to the plasmon hybridization mechanism. The hybridization of the plasmons results in the enhancement of the plasmon fields along with more homogeneous distribution as well as the reduction of localized surface plasmon resonance (LSPR) quenching due to absorption. In this review, we summarize the efforts on the synthesis of hollow metal nanostructures with an emphasis on the galvanic replacement reaction. In the second part of this review, we discuss the advancements on the characterization of plasmonic properties of hollow nanostructures, covering the single nanoparticle experiments, nanoscale characterization via electron energy-loss spectroscopy and modeling and simulation studies. Examples of the applications, i.e. sensing, surface enhanced Raman spectroscopy, photothermal ablation therapy of cancer, drug delivery or catalysis among others, where hollow nanostructures perform better than their solid counterparts, are also evaluated.

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Section: Synthesis Of Hollow Nanostructuresmentioning

confidence: 99%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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“…However, the details still need to be further explored because similar PtCu 3 can be generated in quite different conditions (Figure 9a) 142. Ag‐Au octahedra NFs could be achieved in a two‐step process 143. Ag nanosphere is prepared at the beginning of the reaction, then galvanic etching by AuCl 4 − could change the morphologies and compositions, and finally Ag‐Au NFs are produced (Figure 9c).…”

Section: Novel Structures and Atypical Edgesmentioning

confidence: 99%

Section: Novel Structures and Atypical Edgesmentioning

confidence: 99%

“…In catalytic reaction, the Au NFs show a reaction rate about 2 times faster than Au nanoboxes, and much faster than solid particles 157. Oxidizing aniline to form aromatic azo compounds under mild condition could be achieved by Au‐Ag octahedral NFs, the yield is about 3 times higher than Au‐Ag NPs at 32 h (Figure 9c) 143. The applications of NFs are not restricted in organic synthesis.…”

Section: Novel Structures and Atypical Edgesmentioning

confidence: 99%

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Face the Edges: Catalytic Active Sites of Nanomaterials

Wang

2015

Advanced Science

156

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Edges are special sites in nanomaterials. The atoms residing on the edges have different environments compared to those in other parts of a nanomaterial and, therefore, they may have different properties. Here, recent progress in nanomaterial fields is summarized from the viewpoint of the edges. Typically, edge sites in MoS2 or metals, other than surface atoms, can perform as active centers for catalytic reactions, so the method to enhance performance lies in the optimization of the edge structures. The edges of multicomponent interfaces present even more possibilities to enhance the activities of nanomaterials. Nanoframes and ultrathin nanowires have similarities to conventional edges of nanoparticles, the application of which as catalysts can help to reduce the use of costly materials. Looking beyond this, the edge structures of graphene are also essential for their properties. In short, the edge structure can influence many properties of materials.

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“…The template being oxidized, possessing the lower reduction potential and higher rate of diffusion, loses electrons and the metal being reduced gains electrons. Oxidation is initiated on the crystal lattice plane of the sacrificial template exhibiting the highest surface energy [84,[100][101][102]. Small pinholes, or Kirkendall voids, are formed as a result of this oxidation [103,104].…”

Section: Galvanic Replacementmentioning

confidence: 99%

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

2016

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By electrodeposition and galvanic replacement reaction, we developed a facile, time-saving, cost-effective, and environmentally friendly, two-step synthesis route to obtain a controllable cobalt oxide/Au hierarchically nanostructured electrode for glucose sensing. The nanomaterials were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy, meanwhile, the sensing performance was investigated by cyclic voltammetry and amperometric response. The results revealed that this novel electrode exhibited excellent electrocatalytic performance toward glucose oxidation, with a wide double-linear range from 0.2 μM to 20 mM and a low detection limit of 0.1 μM based on a signal-to-noise ratio of 3, which was mainly attributed to the ability of loading a small amount of Au with good electron conductivity on the surface of cobalt oxide nanosheets with large active surface area and synergistic electrocatalytic activity of Au and cobalt oxide toward glucose electrooxidation. This facile, sensitive, and selective glucose sensor is also proven to be suitable for the detection of glucose in human serum.

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Single-Crystalline Octahedral Au–Ag Nanoframes

Cited by 207 publications

References 23 publications

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Face the Edges: Catalytic Active Sites of Nanomaterials

Controllable Cobalt Oxide/Au Hierarchically Nanostructured Electrode for Nonenzymatic Glucose Sensing

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