An Obtuse Rhombohedral Superlattice Assembled by Pt Nanocubes

Li, Ruipeng; Bian, Kaifu; Wang, Yuxuan; Hollingsworth, Jennifer A.; Hanrath, Tobias; Fang, Jiye; Wang, Zhongwu

doi:10.1021/acs.nanolett.5b02879

Cited by 68 publications

(106 citation statements)

References 45 publications

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“…To further confirm the single crystallinity and nanocrystal orientation, we performed rotating SAXS and single crystal diffraction for sRD superlattices (Supplementary Fig. 5)3435. The <100>, <110> and <111> orientation of superlattice and the orientation of the gold nanocrystal are identified respectively, which demonstrated the single crystallinity of superlattice and consistent orientation of nanocrystals in side.…”

Section: Resultsmentioning

confidence: 92%

“…We perform growth experiments of various types of gold nanocrystals into large-scale superlattices and analyse the crystallographic quality and shape dependency of the resulting superlattices. We emphasize the importance of shape by avoiding using small nanocrystals with relatively long ligand chains as building blocks, which can stabilize the open lattices because of the combination of shape and ligand effects34353637. Details of the formation process of the superlattices are investigated through computer simulations.…”

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confidence: 99%

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Shape-dependent ordering of gold nanocrystals into large-scale superlattices

et al. 2017

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Self-assembly of individual building blocks into highly ordered structures, analogous to spontaneous growth of crystals from atoms, is a promising approach to realize the collective properties of nanocrystals. Yet the ability to reliably produce macroscopic assemblies is unavailable and key factors determining assembly quality/yield are not understood. Here we report the formation of highly ordered superlattice films, with single crystalline domains of up to half a millimetre in two dimensions and thickness of up to several microns from nanocrystals with tens of nanometres in diameter. Combining experimental and computational results for gold nanocrystals in the shapes of spheres, cubes, octahedra and rhombic dodecahedra, we investigate the entire self-assembly process from disordered suspensions to large-scale ordered superlattices induced by nanocrystal sedimentation and eventual solvent evaporation. Our findings reveal that the ultimate coherence length of superlattices strongly depends on nanocrystal shape. Factors inhibiting the formation of high-quality large-scale superlattices are explored in detail.

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Section: Resultsmentioning

confidence: 92%

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confidence: 99%

Shape-dependent ordering of gold nanocrystals into large-scale superlattices

et al. 2017

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“…Both FCC↔BCC and BCC↔SC are solid-solid transitions that are related by linear transformations of the positions of the particle centers. BCC and FCC are related by elongation in one direction [54]; BCC and SC are related by a shear transformation within the unit cell [55]. Both transitions are expected to be diffusionless.…”

Section: Discussionmentioning

confidence: 99%

Shape-driven solid–solid transitions in colloids

Anders

Newman

et al. 2017

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

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Solid-solid phase transitions are the most ubiquitous in nature, and many technologies rely on them. However, studying them in detail is difficult because of the extreme conditions (high pressure/temperature) under which many such transitions occur and the high-resolution equipment needed to capture the intermediate states of the transformations. These difficulties mean that basic questions remain unanswered, such as whether so-called diffusionless solid-solid transitions, which have only local particle rearrangement, require thermal activation. Here, we introduce a family of minimal model systems that exhibits solid-solid phase transitions that are driven by changes in the shape of colloidal particles. By using particle shape as the control variable, we entropically reshape the coordination polyhedra of the particles in the system, a change that occurs indirectly in atomic solid-solid phase transitions via changes in temperature, pressure, or density. We carry out a detailed investigation of the thermodynamics of a series of isochoric, diffusionless solid-solid phase transitions within a single shape family and find both transitions that require thermal activation or are "discontinuous" and transitions that occur without thermal activation or are "continuous." In the discontinuous case, we find that sufficiently large shape changes can drive reconfiguration on timescales comparable with those for self-assembly and without an intermediate fluid phase, and in the continuous case, solid-solid reconfiguration happens on shorter timescales than self-assembly, providing guidance for developing means of generating reconfigurable colloidal materials.colloids | self-assembly | phase transitions | nanoparticles D espite wide-ranging implications for metallurgy (1), ceramics (2), earth sciences (3, 4), reconfigurable materials (5, 6), and colloidal matter (7), fundamental questions remain about basic physical mechanisms of solid-solid phase transitions. One major class of solid-solid transitions is diffusionless transformations. Although in diffusionless transformations, particles undergo only local rearrangement, the thermodynamic nature of diffusionless transitions is unclear (8). This gap in our understanding arises from technical details that limit what we can learn about solid-solid transitions from standard laboratory techniques, such as X-ray diffraction or EM (9). The use of a broader array of experimental, theoretical, and computational techniques could provide better understanding of solidsolid transitions if an amenable class of models could be developed (10). To develop minimal models, it is important to note that solid-solid transitions are accompanied by a change in shape of the coordination polyhedra in the structure (11). Coordination polyhedra reflect the bonding of atoms in a crystal, which suggests that minimal models of solid-solid transitions could be provided by systems in which the shape of coordination polyhedra is directly manipulated. Direct manipulation of coordination polyhedra may be achieved ...

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“…Another very efficient analytical tool for characterization of self‐assembled mesocrystalline materials is high‐resolution synchrotron‐based small/wide‐angle X‐ray scattering (SAXS/WAXS) (including in situ time‐resolved grazing incidence small‐angle X‐ray scattering and grazing incidence wide‐angle X‐ray scattering) . These techniques are developing very fast within the last years and are allowing to determine the packing arrangement and orientational order of nanoparticles not only within solid mesocrystals but also to track in situ their structural evolution during the self‐assembly process …”

Section: Introductionmentioning

confidence: 99%

Self‐Assembled Magnetite Mesocrystalline Films: Toward Structural Evolution from 2D to 3D Superlattices

Brunner

Baburin

Sturm

et al. 2016

Adv Materials Inter

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This study describes synthesis and detailed characterization of 2D and 3D mesocrystalline films produced by self‐assembly of iron oxide (magnetite) truncated nanocubes. The orientational relations between nanocrystals within the superlattice are examined and atomistic models are introduced. In the 2D case, two distinct superstructures (i.e., translational order) of magnetite nanocubes can be observed with p4mm and c2mm layer symmetries while maintaining the same orientational order (with [100]magnetite perpendicular to the substrate). The 3D structure can be approximated by a slightly distorted face‐centered cubic (fcc) superlattice. The most efficient space filling within the 3D superstructure is achieved by changing the orientational order of the nanoparticles and following the “bump‐to‐hollow” packing principle. Namely orientational order is determined by the shape of the nanoparticles with the following orientational relations: [001]SL||[310]magnetite, [001]SL||[301]magnetite, [001]SL||[100]magnetite. Overall the presented data provide a fundamental understanding of a mesocrystal formation mechanism and their structural evolution. Structure, composition, and magnetic properties of the synthesised nanoparticles are also characterized.

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An Obtuse Rhombohedral Superlattice Assembled by Pt Nanocubes

Cited by 68 publications

References 45 publications

Shape-dependent ordering of gold nanocrystals into large-scale superlattices

Shape-dependent ordering of gold nanocrystals into large-scale superlattices

Shape-driven solid–solid transitions in colloids

Self‐Assembled Magnetite Mesocrystalline Films: Toward Structural Evolution from 2D to 3D Superlattices

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