Configuration of twins in glass‐embedded silver nanoparticles of various origin

Hofmeister, H.; Dubiel, M.; Tan, Guolong; Schicke, K.-D.

doi:10.1002/pssa.200590018

Cited by 4 publications

(5 citation statements)

References 1 publication

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“…A close inspection of Figure 4d revealed the presence of twin boundaries in Ag NP, especially in the areas near the surface of the particle. This observation is indeed in good agreement with the results of other experiment, 58 where the twin boundaries were observed to be prevalent in the Ag NP within the glass matrixes.…”

Section: ' Resultssupporting

confidence: 93%

A Novel Method to Improve Crystallinity of Supported Nanoparticles Using Low Melting Point Metals

Liu

Zhu

et al. 2011

J. Phys. Chem. C

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The crystallinity of nanoparticles plays a crucial role in controlling materials’ mechanical, catalytic, magnetic and electronic properties. A novel method to improve the crystallinity of nanoparticles by doping and releasing of low melting point amalgamating metals was proposed and tested. The HRTEM micrographs of AgMC, Hg-doped AgMC, and Hg-released AgMC exhibited a significant improvement in crystallinity of silver nanoparticles supported on chabazite by a mercury adsorption–desorption cycle. Molecular dynamics simulation showed that after doping and removing of amalgamating mercury atoms on a silver nanoparticle with pre-existing defects, the majority of the defects were eliminated and the crystallinity was greatly improved, while such an improvement could not be achieved by conventional thermal annealing.

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Section: ' Resultssupporting

confidence: 93%

A Novel Method to Improve Crystallinity of Supported Nanoparticles Using Low Melting Point Metals

Liu

Zhu

et al. 2011

J. Phys. Chem. C

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“…Figures 7a-c show examples of images of rapidly grown platelet-like particles of Au, which contain parallel twins that each have a thickness of a few atomic layers, as previously reported for Ag [22]. It has been suggested that alloying may reduce some of the problems that result from abnormally rapid growth if the alloy increases the twin boundary energy at the grooves.…”

Section: Three-dimensional Shapes Of Ltpsmentioning

confidence: 59%

“…Weak-beam dark-field imaging has been used to identify icosahedral structures in Rh particles [19]. MTPs have also been imaged in detail using high-resolution TEM (HRTEM) [20][21][22]. The primary disadvantage of HRTEM is that it may provide poor statistics resulting from small numbers of observations.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional shapes and structures of lamellar-twinned fcc nanoparticles using ADF STEM

Gontard¹,

Dunin-Borkowski²,

Gass

et al. 2009

Journal of Electron Microscopy

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Small particles with face-centred cubic structures can have non-single-crystallographic shapes. Here, an approach based on annular dark-field scanning transmission electron microscopy (STEM) is used to obtain information about the crystal sub-units that make up supported and unsupported twinned Pt, Pt alloy and Au nanoparticles. The three-dimensional shapes of two types of lamellar-twinned particles (LTPs) of Pt are obtained using high-angle annular dark-field STEM. Possible growth mechanisms of the LTPs and origins for the contrast features in the recorded images are discussed.

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“…These features are rather similar than those found in silver nanoparticles embedded in glass. 40,41 The addition of 1-decanethiol (C 10 H 21 SH) or 1-dodecanethiol (C 12 H 25 SH) to the as-prepared colloidal suspension typically slightly reduces the mean nanocrystal size and the presence of twin faults; on the other hand, it does not modify significantly the uniformity and the cuboctahedron shape of the AuNCs. As illustrative examples, Figure 1S (see the Supporting Information) shows the HRTEM analysis of a decanethiol-capped AuNC with similar characteristics than those observed in Figure 3a, and Figure 2Sa,b (see the Supporting Information) depicts the HRTEM and FFT analyses of a cuboctahedral dodecanethiol-capped AuNC viewed along the [001] zone axis, respectively.…”

Section: Resultsmentioning

confidence: 99%

Monodisperse Gold Cuboctahedral Nanocrystals Directly Synthesized in Reverse Micelles: Preparation, Colloidal Dispersion in Organic Solvents and Water, Reversible Self-Assembly and Plasmonic Properties

et al. 2019

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The synthesis of organic-solvent-dispersible gold nanoparticles in reverse micelles of didodecyldimethylammonium bromide (DDAB) is revisited in the present investigation. Some parameters of synthesis, specifically the reaction volume and the concentration of the reducing agent, were slightly modified obtaining directly monodisperse gold nanocrystals (AuNCs) without the need to use additional active surfactants or additional treatments such as digestive ripening. Interestingly, most of the obtained AuNCs display the same exposed crystalline faces composed of six bounding facets (four {111} faces and two {002} faces), corresponding to single-crystalline face-centered cubic nanoparticles with a cuboctahedron shape. When these AuNCs are subsequently functionalized with 1decanethiol (C 10 H 21 SH) or 1-dodecanethiol (C 12 H 25 SH), they don't experience significant changes in their size or crystalline texture, however, they self-aggregate directly in the suspension at room temperature into faceted supramolecular structures and exhibit collective plasmonic excitations. Such self-organization is reversible under heating treatments allowing the observation of the influence of the AuNCs aggregation state on their plasmonic properties. Fourier transform infrared spectroscopy reveals that thiols only replace partially the DDAB molecules, and thus, DDAB molecules remain present in the thiol-capped AuNCs. To turn the thiol-capped nanocrystals into water-dispersible nanocrystals and extend their technological potential, they are stabilized with poloxamer 407 obtaining highly stable purple colloids in water.

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Configuration of twins in glass‐embedded silver nanoparticles of various origin

Cited by 4 publications

References 1 publication

A Novel Method to Improve Crystallinity of Supported Nanoparticles Using Low Melting Point Metals

A Novel Method to Improve Crystallinity of Supported Nanoparticles Using Low Melting Point Metals

Three-dimensional shapes and structures of lamellar-twinned fcc nanoparticles using ADF STEM

Monodisperse Gold Cuboctahedral Nanocrystals Directly Synthesized in Reverse Micelles: Preparation, Colloidal Dispersion in Organic Solvents and Water, Reversible Self-Assembly and Plasmonic Properties

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