Synthesis of Trisoctahedral Gold Nanocrystals with Exposed High‐Index Facets by a Facile Chemical Method

Ma, Yanyun; Kuang, Qin; Jiang, Zhiyuan; Xie, Zhaoxiong; Huang, Rong‐Bin; Zheng, Lan‐Sun

doi:10.1002/anie.200802750

Cited by 317 publications

(273 citation statements)

References 36 publications

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“…[47] located inside the triangle. Examples of single-crystalline polyhedral nano crystals of fcc metals that have been successfully synthesized are tetrahexahedron (THH) [14,33,34] /concave cube [15] /truncated ditetragonal prism [35,36] enclosed by {hk0}, trisoctahedron by {hhl}, [13] octapod by {hkk}, [37] and concave hexoctahedron by {hkl}. [38] The presence of twinned boundaries can significantly enrich the morphology of nanocrystals enclosed by a specific surface.…”

Section: Selective Surface Cappingmentioning

confidence: 99%

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Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

et al. 2012

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The shape control of noble metal nanocrystals is crucial to their optical properties and catalysis applications. In this Progress Report, the recent progress of shape-controlled synthesis of Pd and Pt nanostructures assisted by small adsorbates is summarized. The use of small strong adsorbates (e.g., I(-) , CO, amines) makes it possible to fabricate Pd and Pt nanostructures with not only well-defined surface structure but also morphologies that have not been achieved by other synthetic strategies. The roles of small adsorbates in shape control of Pd and Pt nanocrystals are discussed in the Report. Also presented in the Report are unique optical and catalytic properties of several Pd and Pt nanostructures (e.g., ultrathin Pd nanosheets, concave Pt octapod, concave Pd tetrahedra), as well as their bioapplications, to demonstrate the power of using small strong adsorbates in the shape control of Pt and Pd nanostructures.

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Section: Selective Surface Cappingmentioning

confidence: 99%

“…Many of the obtained Au nanocrystals are even bound by high-index facets. [13][14][15][16] High-index facets are highly open surfaces and promising for catalysis applications. However, the surface-dependent catalysis performances of Ag and Au nanocrystals were less explored.…”

Section: Introductionmentioning

confidence: 99%

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

et al. 2012

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“…[4][5][6] In the case of catalysis, not only the shape of the particle but also the exposed crystalline faces are important, which can have a marked influence on both activity and selectivity. 17,18 Interestingly, most synthetic methods to date yield nanostructures with convex shapes enclosed by lowindex {111}, {100}, and/or {110} facets, and there are very few methods [19][20][21][22] that allow one to realize nanostructures with highindex faces. Herein, we describe how seed-mediated methods, originally developed by Murphy et al 23,24 and El-Sayed et al, 25 can be modified with the appropriate surfactant to yield a novel class of high-index {720}-faceted Au concave nanocubes.…”

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confidence: 99%

“…Cyclic voltammetry (CV) is a method commonly used to study the surface structure of bulk Au, 33,34 and recently, this method has also been used to characterize the surface facets of Au nanostructures. 21,22 The CV traces of the concave cubes with different sizes exhibit oxidation peaks around 1.2 ± 0.5 V ( Figure S2). This value is comparable to the result obtained for the THH Au nanoparticles enclosed by {730} facets, which was measured to be 1.18 V. 22 For comparison, the oxidation peak of octahedral Au nanoparticles (edge length 80 nm) was determined to be 1.43 V ( Figure S2).…”

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confidence: 99%

Concave Cubic Gold Nanocrystals with High-Index Facets

et al. 2010

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A new class of gold nanostructures, concave nanocubes, enclosed by 24 high-index {720} facets, have been prepared in a monodisperse fashion by a modified seed-mediated synthetic method. The Cl− counterion in the surfactant plays an essential role in controlling the concave morphology of the final product. The concave nanocubes exhibit higher chemical activities compared with low-index {111}-faceted octahedra.

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“…[19][20][21][22][72][73][74][75][76][77][78][79] Here, the reduction of p-nitrophenol to p-aminophenol was chosen as a model reaction to investigate the catalytic properties of NBs. Furthermore, PFT Pd-Au-Pd segmental nanorods and single crystalline Pd nanocubes and octahedra were also used as catalysts for comparison (Fig.…”

Section: Shape-dependent Catalytic Performancementioning

confidence: 99%

Rational selection of halide ions for synthesizing highly active Au@Pd nanobipyramids

Liu

Hao

et al. 2017

RSC Adv.

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Pd-based nanostructures with stepped facets possess potential applications in many fields, particularly in catalysis. Generally, crystal growth often only allows the formation of nanostructures with energetically non-stepped facets, so it is desirable to develop methods that can be used to prepare Pd-based nanostructures bounded by stepped facets. Herein, penta-fold twinned (PFT) Au@Pd nanobipyramids (NBs) with stepped {100} facets were synthesized through growing Pd on Au decahedral nanoparticles (NPs) in polyol. During the growth of Au@Pd NBs, Br À was a critical factor, because it has appropriate affinity for the Pd atom and adjusted the growth rate ratio along h110i and h100i, resulting in the formation of Au@Pd NBs with stepped {100} facets. The product shape and size could be tailored by controlling the reaction conditions. Transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), energy dispersive spectroscopy (EDS), high angle annular dark field (HAADF) imaging and scanning transmission electron microscopy EDS (STEM-EDS) were used to investigate the structure and growth of the Au@Pd NBs. A growth mechanism involving two stages was elucidated. In the first stage, the growth of Pd clearly occurred along both h110i and h100i. In the second stage, the growth along h110i was faster than that along h100i. Furthermore, we also demonstrated that the as-prepared Au@Pd NBs had high catalytic activity, compared with Pd nanocubes and Pd-Au-Pd segmental nanorods.

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Synthesis of Trisoctahedral Gold Nanocrystals with Exposed High‐Index Facets by a Facile Chemical Method

Abstract: National Natural Science Foundation of China [20725310, 20721001, 20673085, 20671079, J0630429]; National Basic Research Program of China [2007CB815303, 2009CB939804]; Fujian Province of China [2005HZ013

Cited by 317 publications

References 36 publications

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

Concave Cubic Gold Nanocrystals with High-Index Facets

Rational selection of halide ions for synthesizing highly active Au@Pd nanobipyramids

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