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Growth morphology and special diffraction characteristics of multifaceted gold nanoparticles
•Seed based synthesis of nano gold particles with decahedral and truncated tetrahedral morphologies.•Morphological features explained based on supergroup symmetry of the seed.•Triangular streaks around the Bragg spots correlated with shape effect.•Forbidden reflections 1/3{422} from truncated tetrah...
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| Published in: | Micron (Oxford, England : 1993) England : 1993), 2017-03, Vol.94, p.46-52 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | •Seed based synthesis of nano gold particles with decahedral and truncated tetrahedral morphologies.•Morphological features explained based on supergroup symmetry of the seed.•Triangular streaks around the Bragg spots correlated with shape effect.•Forbidden reflections 1/3{422} from truncated tetrahedral nanoparticles understood in terms of intrinsic fault.•Decrease in lattice parameter was corroborated in terms of aforesaid fault.
This paper deals with morphology of synthesized nano gold particles through seed based growth. Various types of morphologies have been observed. They primarily relate to decahedral and truncated tetrahedral shapes. Their relative abundance is dependent on temporal evolution of nanoparticles. These shapes are understood to have evolved from a seed having symmetry that is a supergroup of the point groups possessed by these nanoparticles. The usual pentagonal twinned morphologies observed under High Resolution Transmission Electron Microscopy have displayed two distinct types of interfaces. They have been attributed to cubic and icosahedral three-fold orientations. Such a discussion is lacking in literature. The five triangular faces of decahedral particles are essentially rotational twins resulting out of a common five-fold axis. Two special diffraction features for truncated tetrahedral particles have been observed. They refer to (i) triangular streaks around Braggs spots conforming to three fold symmetry of these particles and (ii) by observation of forbidden reflections of the type 1/3{422} and 2/3{422} along 〈422〉 directions. Latter has been understood in terms of intrinsic fault whereas former arises owing to shape transform of nanoparticles. The presence of faults has helped rationalize decrease of lattice parameter vis-à-vis that of standard FCC gold. The variation of intensities of these forbidden reflections seems to be arising out of density of such intrinsic faults in nano gold particles in addition to dynamical effects. |
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| ISSN: | 0968-4328 1878-4291 |
| DOI: | 10.1016/j.micron.2016.12.002 |