Chiral assemblies of pinwheel superlattices on substrates

Zhou, Shan; Li, Jiahui; Lü, Jun; Liu, Haihua; Kim, Jiyoung; Kim, Ah Young; Yao, Lehan; Liu, Chang; Chang, Qian; Hood, Zachary D.; Chen, Wenxiang; Gage, Thomas; Arslan, Ilke; Travesset, Alex; Sun, Kai; Kotov, Nicholas A.; Chen, Qian

doi:10.1038/s41586-022-05384-8

Cited by 49 publications

(38 citation statements)

References 50 publications

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“…This step is important, as the presence of byproducts would otherwise affect the extension of the NP layers. Similar SCs were obtained for all NPs with different widths, showing an increasing orientational ordering for the larger NPs (see Section 2 in the Supporting Information for a complete discussion about the optimization of the self-assembly conditions). − In the following, we present the results for only one width, for gold/silver NPs of 143.7 ± 9.2 nm in length and 74.8 ± 3.2 nm in width. Scanning electron microscopy (SEM) images show that, after drying on a Si wafer, the NPs solutions leave behind micrometer-sized SCs with a trapezoidal shape (Figure (a,b)).…”

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confidence: 80%

Polymorphous Packing of Pentagonal Nanoprisms

et al. 2023

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Packing solid shapes into regular lattices can yield very complex assemblies, not all of which achieve the highest packing fraction. In two dimensions, the regular pentagon is paradigmatic, being the simplest shape that does not pave the plane completely. In this work, we demonstrate the packing of plasmonic nanoprisms with pentagonal cross section, which form extended supercrystals. We do encounter the long-predicted ice-ray and Dürer packings (with packing fractions of 0.921 and 0.854, respectively) but also a variety of novel polymorphs that can be obtained from these two configurations by a continuous sliding transformation and exhibit an intermediate packing fraction. Beyond the fundamental interest of this result, fine control over the density and symmetry of such plasmonic assemblies opens the perspective of tuning their optical properties, with potential applications in metamaterial fabrication, catalysis, or molecular detection.

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confidence: 80%

Polymorphous Packing of Pentagonal Nanoprisms

et al. 2023

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“…In contrast with spherical NCs, where the breakdown of the hard sphere representation is spontaneous and occurs at low coordination, , in cubes, vertices and edges provide explicit sites for the appearance of vortices; see Figure . Although the precise formulation of the OTM to many relevant shapes ,,− is beyond the scope of this work, the same assumptions used to derive the effective cube sizes (see eq and eq ) also apply to these more complex shapes and the emergence of splayed ligand configurations (vortices) at edges and vertices is therefore a general NC effect.…”

Section: Discussionmentioning

confidence: 99%

“…This study is explicitly performed for cubes, but the arguments, which are summarized in Figure and Figure , are general and apply to any other shapes, for example. ,,− Our own work ref considered, in addition to cubes, truncated cubes and disks with different shapes, which assemble into diverse superlattices.…”

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confidence: 99%

Ligand Effects in Assembly of Cubic and Spherical Nanocrystals: Applications to Packing of Perovskite Nanocubes

et al. 2023

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We establish the formula representing cubic nanocrystals (NCs) as hard cubes taking into account the role of the ligands and describe how these results generalize to any other NC shapes. We derive the conditions under which the hard cube representation breaks down and provide explicit expressions for the effective size. We verify the results from the detailed potential of mean force calculations for two nanocubes in different orientations as well as with spherical nanocrystals. Our results explicitly demonstrate the relevance of certain ligand conformations, i.e., “vortices”, and show that edges and corners provide natural sites for their emergence. We also provide both simulations and experimental results with single component cubic perovskite nanocrystals assembled into simple cubic superlattices, which further corroborate theoretical predictions. In this way, we extend the Orbifold Topological Model (OTM) accounting for the role of ligands beyond spherical nanocrystals and discuss its extension to arbitrary nanocrystal shapes. Our results provide detailed predictions for recent superlattices of perovskite nanocubes and spherical nanocrystals. Problems with existing united atom force fields are discussed.

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“…The synthesis of noble-metal nanocrystals with well-controlled sizes and shapes has also enabled their use as building blocks for self-assembly . Going beyond the single particle level, self-assembly offers an effective route to complex nanostructures with new or enhanced optical properties. , In a typical self-assembly process, building blocks such as molecules and mesoscopic objects are organized into new structures through noncovalent interactions. The resultant structures are determined by the features encoded on the building blocks, including, for example, topology, shape, and surface functionality.…”

Section: Applicationsmentioning

confidence: 99%

Silver Nanocubes: From Serendipity to Mechanistic Understanding, Rational Synthesis, and Niche Applications

Pawlik

Zhou

et al. 2023

Chem. Mater.

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Silver has long been interwoven into human history, and its uses have evolved from currency and jewelry to medicine, information technology, catalysis, and electronics. Within the last century, the development of nanomaterials has further solidified the importance of this element. Despite this long history, there was essentially no mechanistic understanding or experimental control of silver nanocrystal synthesis until about two decades ago. Here we aim to provide an account of the history and development of the colloidal synthesis of silver nanocubes, as well as some of their major applications. We begin with a description of the first accidental synthesis of silver nanocubes that spurred subsequent investigations into each of the individual components of the protocol, revealing piece by piece parts of the mechanistic puzzle. This is followed by a discussion of the various obstacles inherent to the original method alongside mechanistic details developed to optimize the synthetic protocol. Finally, we discuss a range of applications enabled by the plasmonic and catalytic properties of silver nanocubes, including localized surface plasmon resonance, surface-enhanced Raman scattering, metamaterials, and ethylene epoxidation, as well as further derivatization and development of size, shape, composition, and related properties.

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Chiral assemblies of pinwheel superlattices on substrates

Cited by 49 publications

References 50 publications

Polymorphous Packing of Pentagonal Nanoprisms

Polymorphous Packing of Pentagonal Nanoprisms

Ligand Effects in Assembly of Cubic and Spherical Nanocrystals: Applications to Packing of Perovskite Nanocubes

Silver Nanocubes: From Serendipity to Mechanistic Understanding, Rational Synthesis, and Niche Applications

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