Five-fold twinned pentagonal gold nanocrystal structure exclusively bounded by {110} facets

Liu, Tengjiao; Jiang, Peng; You, Qi; Ye, Shufeng

doi:10.1039/c2ce26665b

Cited by 16 publications

(25 citation statements)

References 14 publications

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“…Au nanodecahedrons with edges around 100 nm in length, synthesized in DMF, had been reported by Liu et al In our study, this synthesis protocol was first utilized as a prerequisite for the growth of pentatwinned Au seeds. In brief, the Au seeds were obtained by a two‐step seed‐mediated growth method, and the synthesis details were adjusted to obtain efficient Au seeds for the growth of Ag nanorods.…”

Section: Resultsmentioning

confidence: 74%

Synthesis of Ag Nanorods with Highly Tunable Plasmonics toward Optimal Surface‐Enhanced Raman Scattering Substrates Self‐Assembled at Interfaces

Tian

Lin

Dong

et al. 2017

Advanced Optical Materials

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Plasmonic nanoparticles, such as Au, Ag, and Cu nanoparticles, can support the collective oscillation of free electrons in the metals excited by electromagnetic radiation, generating resonant extinction peaks and significantly enhanced electric near-fields as well as hot carriers. [1] The plasmonic properties of nanoparticles have enabled a vast range of applications, Ag nanorods receive intensive attention due to the excellent plasmonic properties. However, the difficulty in synthesis of monodisperse Ag nanorods with broad aspect ratios has limited their in-depth applications. Here, a seed-mediated method is reported for the synthesis of Ag nanorods with lengths from 65 to 5000 nm, corresponding to aspect ratios from 2 to 156. The plasmonic resonance is tuned from visible to mid-infrared wavelength. The synthesis protocol relies on robust Au seeds synthesized in N,N-dimethylformamide (DMF), which induces the one-dimensional (1D) growth of Ag atoms. To maintain symmetry breaking initiated by the Au seeds, the reduction rate of Ag + is decreased by adding hexadecyltrimethylammonium chloride (CTAC) to form AgCl particles. The optimized conditions to prevent the homogeneous nucleation of Ag nanoparticles and residue of AgCl particles in products are identified, under which the conversion efficiency of Ag ions to Ag nanorods is evaluated about 48%. More importantly, the anisotropic Ag nanorods are selfassembled into monolayers at interfaces with the long axis of Ag nanorods perpendicular or parallel to the interfaces, respectively. The as-fabricated monolayers exhibit uniform and reproducible surface-enhanced Raman scattering (SERS) activities. The optimal SERS performance is achieved from Ag nanorod monolayer with vertical orientation and the longest rod length.

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Section: Resultsmentioning

confidence: 74%

Synthesis of Ag Nanorods with Highly Tunable Plasmonics toward Optimal Surface‐Enhanced Raman Scattering Substrates Self‐Assembled at Interfaces

Tian

Lin

Dong

et al. 2017

Advanced Optical Materials

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show abstract

“…Indeed, the common polycrystalline forms of metal NPs are the multiply twinned particles (MTP), which are the decahedron and icosahedron. 12,17,19,30 The former shape has 5 twins distributed on a quinary symmetry axis while the latter one has 30 twins distributed on 12 quinary symmetry axes. The single-domain shapes are well reproduced with the Wulff formula, which usually results in the truncated octahedron shape for fcc metals.…”

Section: Introductionmentioning

confidence: 99%

“…11,12,17 Nonetheless, one parameter that is not yet well controlled is their nanocrystallinity, i.e. the amount of crystal defects inside the NP.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, current syntheses are limited to the production of one form of nanocrystallinity, either single-domain or polycrystalline. 12,18 The capability of synthesis of NPs with the desired nanocrystallinity with narrow size and shape distribution in an identical chemical environment (i.e. concentration and nature of reagents) is still lacking.…”

Section: Introductionmentioning

confidence: 99%

“…5,6,8,9 Chemical syntheses are nowadays available to rationalize the production of metal NPs with controllable size and shape. [10][11][12][13][14][15][16][17][18][19][20][21] One of the most efficient methodologies for well-controlled chemical synthesis is the seeded-growth method, which allows fine control of the gold NP growth on already-prepared seeds.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

et al. 2015

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The influence of nanocrystallinity on the electronic and mechanical properties of metal nanoparticles is still poorly understood, due to the difficulty in synthesizing nanoparticles with a controlled internal structure. Here, we report on a new method for the selective synthesis of Au nanoparticles in either a singledomain or a polycrystalline phase maintaining the same chemical environment. We obtain quasi-spherical nanoparticles whose diameter is tunable from 6 to 13 nm with a resolution down to ≈0.5 nm and narrow size distribution (4-5%). The availability of such high-quality samples allows the study of the impact of the particle size and nanocrystallinity on a number of parameters, such as plasmon dephasing time, electronphonon coupling, period and damping time of the radial breathing modes.

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Scaling up the Production of Colloidal Nanocrystals: Should We Increase or Decrease the Reaction Volume?

2014

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Recent progress in facet-controlled syntheses has started to produce nanocrystals with great promise as the next-generation catalysts for a variety of applications. To move from academic studies to industrial applications, however, one has to address the issue of scaling up a synthesis that has been commonly conducted in a batch format. There are two opposite approaches to scaling up the production of colloidal nanocrystals: increasing and decreasing the reaction volume. Contrary to conventional wisdom, continuous flow synthesis based on droplets is expected to provide a more practical platform for scaling up the synthesis. Here we highlight recent progress in using droplet reactors for the synthesis of colloidal noble-metal nanocrystals with controlled sizes and shapes, with an aim towards high-volume production.

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Five-fold twinned pentagonal gold nanocrystal structure exclusively bounded by {110} facets

Cited by 16 publications

References 14 publications

Synthesis of Ag Nanorods with Highly Tunable Plasmonics toward Optimal Surface‐Enhanced Raman Scattering Substrates Self‐Assembled at Interfaces

Synthesis of Ag Nanorods with Highly Tunable Plasmonics toward Optimal Surface‐Enhanced Raman Scattering Substrates Self‐Assembled at Interfaces

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

Scaling up the Production of Colloidal Nanocrystals: Should We Increase or Decrease the Reaction Volume?

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