Size-Dependent Multiple Twinning in Nanocrystal Superlattices

Rupich, Sara M.; Shevchenko, Elena V.; Bodnarchuk, Maryna I.; Lee, Byeongdu; Talapin, Dmitri V.

doi:10.1021/ja9074425

Cited by 140 publications

(164 citation statements)

References 57 publications

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“…The use of imperfect building blocks in bottom-up nanoparticle assemblies often results in defects, grain boundaries, and lattice strain (30)(31)(32)(33)(34)(35). In the systems studied in this work, molecular dynamics simulations suggest that DNA-assembled particles can exhibit 5-10% variation in their position due to the dynamic reorganization that occurs as interparticle linkages break and reform (36).…”

Section: Resultsmentioning

confidence: 85%

Defect tolerance and the effect of structural inhomogeneity in plasmonic DNA-nanoparticle superlattices

Ross

Blaber

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Bottom-up assemblies of plasmonic nanoparticles exhibit unique optical effects such as tunable reflection, optical cavity modes, and tunable photonic resonances. Here, we compare detailed simulations with experiment to explore the effect of structural inhomogeneity on the optical response in DNA-gold nanoparticle superlattices. In particular, we explore the effect of background environment, nanoparticle polydispersity (>10%), and variation in nanoparticle placement (∼5%). At volume fractions less than 20% Au, the optical response is insensitive to particle size, defects, and inhomogeneity in the superlattice. At elevated volume fractions (20% and 25%), structures incorporating different sized nanoparticles (10-, 20-, and 40-nm diameter) each exhibit distinct far-field extinction and near-field properties. These optical properties are most pronounced in lattices with larger particles, which at fixed volume fraction have greater plasmonic coupling than those with smaller particles. Moreover, the incorporation of experimentally informed inhomogeneity leads to variation in far-field extinction and inconsistent electric-field intensities throughout the lattice, demonstrating that volume fraction is not sufficient to describe the optical properties of such structures. These data have important implications for understanding the role of particle and lattice inhomogeneity in determining the properties of plasmonic nanoparticle lattices with deliberately designed optical properties.T he rational arrangement of nanoparticles in multiple dimensions is a promising means for creating materials with novel properties not found in nature. Noble metal nanoparticles are interesting material building blocks due to their ability to amplify local fields by orders of magnitude and scatter light well below the diffraction limit. These efficient interactions with visible light are due to localized surface plasmon resonances (LSPRs), the collective oscillation of conduction electrons (1). Hierarchical arrangements of plasmonic nanoparticles have become the basis for colorimetric sensors (2, 3), subdiffraction limited waveguides (4), visible light metamaterials (5), and nanoscale lasing devices (6, 7), and the ability to adjust architecture in such materials has led to a wide variety of structures with tunable and unusual optical properties (8-12). Many of these technologies leverage the scalability and modularity of bottom-up assembly techniques, which use chemically synthesized colloidal nanoparticles as building blocks (13,14). Unfortunately, all nanoparticle assembly techniques result in materials with structural defects across multiple length scales, including imprecise particle placement, grain boundaries, and variation in crystallite size. In addition, the nanoparticles used in these systems are inherently inhomogeneous: varying in size, shape, and radius of curvature. Although the effects of inhomogeneity have been investigated at the individual nanoparticle level (15, 16), the effects of inhomogeneity on plasmonic assemblies are...

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Section: Resultsmentioning

confidence: 85%

Defect tolerance and the effect of structural inhomogeneity in plasmonic DNA-nanoparticle superlattices

Ross

Blaber

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…[43] The most favourable defect formation kinetics was observed for Au0.25Ag0.75 nanoparticle seeds through the epitaxial defect transfer mechanism (Figure 2d). Differences in stacking fault energy, formation enthalpy and coalescence chemistry for alloy seeds with varying intermetallic compositions result in distinctive twin formation in nanoparticle seeds, enabling overall control over twin formation in Ge nanowires.…”

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confidence: 95%

Inducing imperfections in germanium nanowires

2017

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Access to the full text of the published version may require a subscription. Rights © Tsinghua University Press and Springer-Verlag Berlin Heidelberg2017. This is a pre-print of an article published in Nano Research. and/or interfacial manipulation. An "epitaxial defect transfer" process and catalyst-nanowire interfacial engineering is employed to induce twin defects parallel and perpendicular to the nanowire growth axis. By inducing and manipulating twin boundaries in the metal catalysts, twin formation and density is controlled in Ge nanowires. The formation of Ge polytypes is also observed in nanowires for the growth of highly dense lateral twin boundaries.Additionally, metal impurity, in the form of Sn, is injected and engineered via third-party metal catalysts resulting above-equilibrium incorporation of Sn adatoms in Ge nanowires. Sn impurities are precipitated into Ge bi-layers during Ge nanowire growth, where the impurity Sn atoms become trapped with the deposition of successive layers, thus giving an extraordinary Sn content (> 6 at.%) in the Ge nanowires. A larger amount of Sn impingement (> 9 at.%) is further encouraged by the utilising eutectic solubility of Sn in Ge along with the impurity trapping.

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“…36 A particularly interesting aspect of colloidal crystal micro-structure is twinning. From Au-nanocrystals and other freely growing (colloidal) crystallites it seems to be decisive for the habitat, [37][38][39] while for casted materials one may expect severe influence on the micro-structure. 40 It had first been recognized by electron microscopy on natural opals 41 and later analyzed from Bragg powder patterns of the principal diffraction peak of colloidal hard sphere suspensions.…”

Section: Introductionmentioning

confidence: 99%

Micro-structure evolution of wall based crystals after casting of model suspensions as obtained from Bragg microscopy

Palberg

Maaroufi

Stipp

et al. 2012

The Journal of Chemical Physics

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Nucleation and crystal growth in a suspension of charged colloidal silica spheres with bi-modal size distribution studied by time-resolved ultra-small-angle X-ray scattering The Journal of Chemical Physics 141, 214906 (2014) Growth of heterogeneously nucleated, wall based crystals plays a major role in determining the micro-structure during melt casting. This issue is here addressed using a model system of charged colloidal spheres in deionized aqueous suspension observed by Bragg microscopy which is a combination of light scattering and microscopy. We examine the evolution of the three-dimensional size, shape, and orientation of twin domains in monolithic crystals growing from two opposing planar walls into a meta-stable (shear-) melt. At each wall crystal orientation and twinning emerges during nucleation with small domains. During growth these widen and merge. From image analysis we observe the lateral coarsening velocities to follow a power law behaviour L XY ∝ t 1/2 as long as the vertical growth continues at constant speed. Lateral coarsening terminates upon intersection of the two solids and hardly any further ripening is seen. Initial lateral coarsening velocities show a Wilson Frenkel type dependence on the melt meta-stability.

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Size-Dependent Multiple Twinning in Nanocrystal Superlattices

Cited by 140 publications

References 57 publications

Defect tolerance and the effect of structural inhomogeneity in plasmonic DNA-nanoparticle superlattices

Defect tolerance and the effect of structural inhomogeneity in plasmonic DNA-nanoparticle superlattices

Inducing imperfections in germanium nanowires

Micro-structure evolution of wall based crystals after casting of model suspensions as obtained from Bragg microscopy

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