3D Nanofabrication via Chemo‐Mechanical Transformation of Nanocrystal/Bulk Heterostructures

Zhang, Mingliang; Guo, Jiacen; Yao, Yu; Wu, Yao‐Ting; Yun, Hongseok; Jishkariani, Davit; Chen, Wenxiang; Greybush, Nicholas J.; Kübel, Christian; Stein, Aaron; Murray, Christopher B.; Kagan, Cherie R.

doi:10.1002/adma.201800233

“…An eclipsed geometry would require longer Sn-Sn distances and would likely break the 3-fold rotational symmetry, and longer Sn-Sn distances would not minimize the free volume in the structure. We therefore hypothesize that the chiral three-connected srs net is templated by the tetrahedral shape of the SnI4 molecules, suggesting that appropriately sized and shaped 48 colloidal nanocrystals and/or engineered nanostructures 36 may also be able to self-assemble into chiral assemblies with the SrSi2 structure.…”

Section: Resultsmentioning

confidence: 99%

“…Our results lay the framework for the design and creation of novel optical and catalytic materials formed by the self-assembly of highly symmetric precursors. In addition to molecules, the principles developed herein can guide the design of mixtures of tetrahedral 48 and spherical nanoparticles and/or engineered nanostructures 36 that will self-assemble into chiral SrSi2-type structures.…”

Section: Discussionmentioning

confidence: 99%

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

Straus

¹

,

Cava²

2020

Preprint

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The design of new chiral materials usually requires stereoselective organic synthesis to create molecules with chiral centers. Less commonly, achiral molecules can self-assemble into chiral materials, despite the absence of intrinsic molecular chirality. Here, we demonstrate the assembly of high-symmetry molecules into a chiral van der Waals structure by synthesizing crystals of C60(SnI4)2 from icosahedral buckminsterfullerene (C60) and tetrahedral SnI4 molecules through spontaneous self-assembly. The SnI4 tetrahedra template the Sn atoms into a chiral cubic three-connected net of the SrSi2 type that is held together by van der Waals forces. Our results represent the remarkable emergence of a self-assembled chiral material from two of the most highly symmetric molecules, demonstrating that almost any molecular, nanocrystalline, or engineered precursor can be considered when designing chiral assemblies.

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“…The vast structural diversity of these "artificial atoms" comprising superlattices is truly staggering, as highlighted in (33). Another exciting synergy between the library of NC building blocks, surface chemistries, and superlattice assemblies is the advent of ligand-exchange chemistry, wherein ligands can be exchanged after self-assembly of superlattices of a particular ordering (11,34,35). This modality, in addition to galvanic reactions and Kirkendell effects, opens the door to a large tunability in the properties of superlattices given the control of the "bond" length and physical attributes.…”

Section: Introductionmentioning

confidence: 99%

Bridging functional nanocomposites to robust macroscale devices

Begley

¹

,

Gianola

²

,

Ray

³

2019

Science

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At the intersection of the outwardly disparate fields of nanoparticle science and three-dimensional printing lies the promise of revolutionary new “nanocomposite” materials. Emergent phenomena deriving from the nanoscale constituents pave the way for a new class of transformative materials with encoded functionality amplified by new couplings between electrical, optical, transport, and mechanical properties. We provide an overview of key scientific advances that empower the development of such materials: nanoparticle synthesis and assembly, multiscale assembly and patterning, and mechanical characterization to assess stability. The focus is on recent illustrations of approaches that bridge these fields, facilitate the design of ordered nanocomposites, and offer clear pathways to device integration. We conclude by highlighting the remaining scientific challenges, including the critical need for assembly-compatible particle–fluid systems that ultimately yield mechanically robust materials. The role of domain boundaries and/or defects emerges as an important open question to address, with recent advances in fabrication setting the stage for future work in this area.

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“…[32][33][34] The emergence of chirality from the combination of these highly symmetric achiral molecules provides design principles for the three-dimensional chiral self-assembly of molecules, colloidal nanocrystals, 35 and engineered nanostructures. 36…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

Straus

¹

,

Cava²

2020

Preprint

View full text Add to dashboard Cite

The design of new chiral materials usually requires stereoselective organic synthesis to create molecules with chiral centers. Less commonly, achiral molecules can self-assemble into chiral materials, despite the absence of intrinsic molecular chirality. Here, we demonstrate the assembly of high-symmetry molecules into a chiral van der Waals structure by synthesizing crystals of C60(SnI4)2 from icosahedral buckminsterfullerene (C60) and tetrahedral SnI4 molecules through spontaneous self-assembly. The SnI4 tetrahedra template the Sn atoms into a chiral cubic three-connected net of the SrSi2 type that is held together by van der Waals forces. Our results represent the remarkable emergence of a self-assembled chiral material from two of the most highly symmetric molecules, demonstrating that almost any molecular, nanocrystalline, or engineered precursor can be considered when designing chiral assemblies.

show abstract

3D Nanofabrication via Chemo‐Mechanical Transformation of Nanocrystal/Bulk Heterostructures

Cited by 19 publications

References 37 publications

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

Bridging functional nanocomposites to robust macroscale devices

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

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