High‐Yield Synthesis of Single‐Crystalline Gold Nano‐octahedra

Li, Cuncheng; Shuford, Kevin L.; Park, Q.-Han; Cai, Weiping; Li, Yue; Lee, Eun Je; Cho, Sung Oh

doi:10.1002/anie.200604167

Cited by 218 publications

(147 citation statements)

References 74 publications

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“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] The primary step of this process involves the reduction of a metal salt by a polyol at an elevated temperature in the presence of a polymeric stabilizer such as poly(vinyl pyrrolidone) (PVP). Despite its success in controlling the shape of many noble metal nanocrystals, however, the major products are often restricted to cuboctahedrons or truncated cubes due to the fast reduction and growth rates associated with the strong reducing power of a polyol.…”

Section: Introductionmentioning

confidence: 99%

Shape‐Controlled Synthesis of Pd Nanocrystals in Aqueous Solutions

Lim

Jiang

Tao

et al. 2009

Adv Funct Materials

595

486

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This article provides an overview of recent developments regarding synthesis of Pd nanocrystals with well‐controlled shapes in aqueous solutions. In a solution‐phase synthesis, the final shape taken by a nanocrystal is determined by the twin structures of seeds and the growth rates of different crystallographic facets. Here, the maneuvering of these factors in an aqueous system to achieve shape control for Pd nanocrystals is discussed. L‐ascorbic acid, citric acid, and poly(vinyl pyrrolidone) are tested for manipulating the reduction kinetics, with citric acid and Br– ions used as capping agents to selectively promote the formation of {111} and {100} facets, respectively. The distribution of single‐crystal versus multiple‐twinned seeds can be further manipulated by employing or blocking oxidative etching. The shapes obtained for the Pd nanocrystals include truncated octahedron, icosahedron, octahedron, decahedron, hexagonal and triangular plates, rectangular bar, and cube. The ability to control the shape of Pd nanocrystals provides a great opportunity to systematically investigate their catalytic, electrical, and plasmonic properties.

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Section: Introductionmentioning

confidence: 99%

Shape‐Controlled Synthesis of Pd Nanocrystals in Aqueous Solutions

Lim

Jiang

Tao

et al. 2009

Adv Funct Materials

595

486

View full text Add to dashboard Cite

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“…(2) Indeed, the 54 nm octahedra with hollow features have an SPR maximum at 605 nm, which is 25 nm red-shifted from that of similar-sized solid Au octahedra ( Figure S4). (34) Many of the plasmonic applications of noble metal nanostructures rely on the ability to tailor the SPR of a particle to a desired wavelength. (35)(36)(37)(38) Other researchers have shown that the SPRs of hollow spherical gold nanoparticles are dependent on the size of their hollow cavity (3) and the thickness of the metal shell.…”

Section: Introductionmentioning

confidence: 99%

Bottom-Up Synthesis of Gold Octahedra with Tailorable Hollow Features

et al. 2011

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Gold octahedra with hollow features have been synthesized in high yield via the controlled overgrowth of preformed concave cube seeds. This Ag+-assisted, seed-mediated synthesis allows for the average edge length of the octahedra and the size of the hollow features to be independently controlled. We propose that a high concentration of Ag+ stabilizes the {111} facets of the octahedra through underpotential deposition while the rate of Au+ reduction controls the dimensions of the hollow features. This synthesis represents a highly controllable bottom-up approach for the preparation of hollow gold nanostructures.

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“…[6][7][8][9][10][11][12][13] Among various MNPs, gold nanoparticles (GNPs) are particularly interesting due to their remarkable size-and shapedependant optical and catalytic properties and numerous potential applications. [11,[14][15][16][17][18] Consequently, several methods are available in the literature to produce GNPs ranging from rods, [9,19] cubes/polyhedra, [20][21][22][23] multipods, [14,24] to triangular nanoplates [4,25] and nanoprisms. [26] Conventional approaches for the production of anisotropic GNPs rely on the availability of surfactants, polymeric or biological templates that preferentially adsorb on specific crystallographic facets and hence modify the relative growth rates of the facets.…”

Section: Introductionmentioning

confidence: 99%

Templateless Synthesis of Polygonal Gold Nanoparticles: An Unsupported and Reusable Catalyst with Superior Activity

Rashid¹,

Mandal²

2008

Adv Funct Materials

146

108

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We report the synthesis of polygonal gold nanoparticles (GNPs) by an in situ reduction technique using ferric ammonium citrate as reducing agent in absence of any surfactant or polymeric template. Transmission electron microscopic analysis and selected area electron diffraction patterns confirmed the formation of well‐crystalline polygonal GNPs grown preferentially along the (111) direction, which is consistent with the results of X‐ray diffractometry analysis. The results of control experiments of HAuCl4 with tri‐ammonium citrate in presence of different externally added metal ions like Fe3+, Ni2+, Cu2+, Zn2+, and Al3+ suggested the ion‐induced growth mechanism in the formation of polygonal GNPs. The purified polygonal GNPs were then successfully used as catalyst in the borohydride reduction of three isomeric nitrophenols and also in the aerobic oxidation of different D‐hexoses (e.g., D‐glucose, D‐mannose, D‐fructose). The catalytic activity of these polygonal GNPs is higher by a factor of 300–1000, depending on the GNP's sample type, in nitrophenol reduction compared to that of spherical GNPs. Similar activity enhancement was also observed in the aerobic oxidation of different D‐hexoses. These polygonal GNPs catalyst are very stable and could be reused several times in the borohydride reduction of nitrophenols without much losing in their virgin catalytic activity.

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High‐Yield Synthesis of Single‐Crystalline Gold Nano‐octahedra

Cited by 218 publications

References 74 publications

Shape‐Controlled Synthesis of Pd Nanocrystals in Aqueous Solutions

Shape‐Controlled Synthesis of Pd Nanocrystals in Aqueous Solutions

Bottom-Up Synthesis of Gold Octahedra with Tailorable Hollow Features

Templateless Synthesis of Polygonal Gold Nanoparticles: An Unsupported and Reusable Catalyst with Superior Activity

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