Theoretical Description of the Role of Halides, Silver, and Surfactants on the Structure of Gold Nanorods

Almora‐Barrios, Neyvis; Novell-Leruth, Gerard; Whiting, Peter; Liz‐Marzán, Luis M.; López, Núria

doi:10.1021/nl404661u

Cited by 161 publications

(203 citation statements)

References 49 publications

Supporting

Mentioning

184

Contrasting

Unclassified

Order By: Relevance

“…Environments A and B favor {100} and high order {210} facets, respectively, which qualitatively mimics ab initio results of Almora-Barrios et al 43 for CTAB and CTASB adsorption on gold, respectively. Even though the strength, ϵ, of the gold− environment interaction is smaller in environment B, it is more strongly coordination dependent.…”

Section: Discussionsupporting

confidence: 83%

Twinned Gold Nanoparticles under Growth: Bipyramids Shape Controlled by Environment

Ozdil

Cortes-Huerto

Testard

et al. 2015

Crystal Growth & Design

View full text Add to dashboard Cite

The structure of (Au) bipyramids, very promising for their specific plasmonic properties, is fully analyzed for gradual stages of growth. From combined use of HRTEM (high resolution transmission electronic microscopy) in specific conditions and SAED (selected area electronic diffraction) analysis, the atomic structure of these elongated objects of different sizes is extracted (from 2 to 60 nm). In the case of silver(I)-assisted growth from citrate capped seeds, a clear pentatwinned structure, made by the superimposition of specific pairs of crystallographic zones is found for the different size nanoparticles representing the different steps of the growing bipyramids. The experimental results were analyzed in the framework of a recent atomistic approach developed for metal−environment interactions to account for the stability of multitwinned nanorods or bipyramids in a complex environment. Efficient in describing the multitwinned nanoparticles and the drastic effects of environment on the stabilization of elongated multitwinned shapes, this model supports the experimental features of bipyramids and nanorods formation from citrate seeds as a function of the nature of the surface chemical ligands: citrate seeds in a growth solution prepared without silver(I) yields the formation of a few pentatwinned nanorods, while the silver(I)-assisted growth process mainly leads to pentatwinned bipyramids. The conservation of a bulk pentatwinned structure inherited from isotropic decahedral (i-Dh) seeds all along the growth is retrieved by this approach for two different environments.

show abstract

Section: Discussionsupporting

confidence: 83%

Twinned Gold Nanoparticles under Growth: Bipyramids Shape Controlled by Environment

Ozdil

Cortes-Huerto

Testard

et al. 2015

Crystal Growth & Design

View full text Add to dashboard Cite

show abstract

“…bromide has been shown to be effective in transformation of Ag planar twinned morphologies into 3-D cubes and bipyramids by stabilizing (100) planes38. Bromide has been shown experimentally and computationally to strongly coordinate to silver and to drive selective facet stabilization in silver and gold nanoparticles40. In our work, the presence of bromide enables the transformation of 2-D bimorphic growth into 3-D by arresting platelet growth, first making them smaller and thicker (Fig.…”

Section: Resultsmentioning

confidence: 59%

Symmetry Breaking by Surface Blocking: Synthesis of Bimorphic Silver Nanoparticles, Nanoscale Fishes and Apples

Cathcart

Kitaev

2016

Sci Rep

View full text Add to dashboard Cite

A powerful approach to augment the diversity of well-defined metal nanoparticle (MNP) morphologies, essential for MNP advanced applications, is symmetry breaking combined with seeded growth. Utilizing this approach enabled the formation of bimorphic silver nanoparticles (bi-AgNPs) consisting of two shapes linked by one regrowth point. Bi-AgNPs were formed by using an adsorbing polymer, poly(acrylic acid), PAA, to block the surface of a decahedral AgNP seed and restricting growth of new silver to a single nucleation point. First, we have realized 2-D growth of platelets attached to decahedra producing nanoscale shapes reminiscent of apples, fishes, mushrooms and kites. 1-D bimorphic growth of rods (with chloride) and 3-D bimorphic growth of cubes and bipyramids (with bromide) were achieved by using halides to induce preferential (100) stabilization over (111) of platelets. Furthermore, the universality of the formation of bimorphic nanoparticles was demonstrated by using different seeds. Bi-AgNPs exhibit strong SERS enhancement due to regular cavities at the necks. Overall, the reported approach to symmetry breaking and bimorphic nanoparticle growth offers a powerful methodology for nanoscale shape design.

show abstract

“…However, experimentally it has been found that objects such as nanorods can be systematically produced with an adequate selection of the solution growth. In that case the symmetry breaking appears very early in the formation of the seed as then some of the facets (but not all those equivalent by symmetry) can be blocked and in this way anisotropy can be easily induced [60]. A typical model for a metal surface in equilibrium with surfactants is shown in Fig.…”

Section: Reviewmentioning

confidence: 99%

Nanoparticle shapes by using Wulff constructions and first-principles calculations

Barmparis

Łodziana

López

et al. 2015

Beilstein J. Nanotechnol.

221

162

View full text Add to dashboard Cite

Summary Background: The majority of complex and advanced materials contain nanoparticles. The properties of these materials depend crucially on the size and shape of these nanoparticles. Wulff construction offers a simple method of predicting the equilibrium shape of nanoparticles given the surface energies of the material. Results: We review the mathematical formulation and the main applications of Wulff construction during the last two decades. We then focus to three recent extensions: active sites of metal nanoparticles for heterogeneous catalysis, ligand-protected nanoparticles generated as colloidal suspensions and nanoparticles of complex metal hydrides for hydrogen storage. Conclusion: Wulff construction, in particular when linked to first-principles calculations, is a powerful tool for the analysis and prediction of the shapes of nanoparticles and tailor the properties of shape-inducing species.

show abstract

Theoretical Description of the Role of Halides, Silver, and Surfactants on the Structure of Gold Nanorods

Cited by 161 publications

References 49 publications

Twinned Gold Nanoparticles under Growth: Bipyramids Shape Controlled by Environment

Twinned Gold Nanoparticles under Growth: Bipyramids Shape Controlled by Environment

Symmetry Breaking by Surface Blocking: Synthesis of Bimorphic Silver Nanoparticles, Nanoscale Fishes and Apples

Nanoparticle shapes by using Wulff constructions and first-principles calculations

Contact Info

Product

Resources

About