Cluster-mediated assembly enables step-growth copolymerization from binary nanoparticle mixtures with rationally designed architectures

Zhang, Xianfeng; Lv, Longfei; Wu, Guanhong; Yang, Dong; Dong, Angang

doi:10.1039/c8sc00220g

Cited by 18 publications

(13 citation statements)

References 32 publications

(59 reference statements)

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“… 23 They argue that the stacking direction occurs most likely in the {100} NC direction, similar to the NCs in the SPs in this work. Others have also found that these perovskite NCs readily assemble into one-dimensional chains by addition of molecular clusters 24 , 25 or through ligand–solvent interactions. 26 Such stacks could hence be a precursor phase in the formation of the SPs presented in this work.…”

Section: Results and Discussionmentioning

confidence: 99%

Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr₃ Perovskite Nanocrystals

et al. 2018

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Colloidal CsPbBr3 nanocrystals (NCs) have emerged as promising candidates for various opto-electronic applications, such as light-emitting diodes, photodetectors, and solar cells. Here, we report on the self-assembly of cubic NCs from an organic suspension into ordered cuboidal supraparticles (SPs) and their structural and optical properties. Upon increasing the NC concentration or by addition of a nonsolvent, the formation of the SPs occurs homogeneously in the suspension, as monitored by in situ X-ray scattering measurements. The three-dimensional structure of the SPs was resolved through high-angle annular dark-field scanning transmission electron microscopy and electron tomography. The NCs are atomically aligned but not connected. We characterize NC vacancies on superlattice positions both in the bulk and on the surface of the SPs. The occurrence of localized atomic-type NC vacancies—instead of delocalized ones—indicates that NC–NC attractions are important in the assembly, as we verify with Monte Carlo simulations. Even when assembled in SPs, the NCs show bright emission, with a red shift of about 30 meV compared to NCs in suspension.

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Section: Results and Discussionmentioning

confidence: 99%

Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr₃ Perovskite Nanocrystals

et al. 2018

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“…In one example, a molecular cluster-based approach has been used to induce anisotropic assemblies of a wide variety of nanomaterials, including CsPbBr 3 NCs. [349,350] Specifically, hydrophobic colloidal NCs were found to self-assemble to form 1D superlattice chains in the presence of molecular clusters such as PbSO 4 ligated with OAm, that could extend beyond 1 µm in length (Fig- ure 11A,B). [349] The self-assembly occurs through the formation of a polymer-like cluster shell, which happens as a result of the strong interactions between the OA and OAm capping ligands on the NCs and the clusters (Figure 11A).…”

Section: Self-assembly and Pressure Processing Of Lhp Ncsmentioning

confidence: 99%

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

et al. 2021

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Lead halide perovskite (LHP) nanocrystals (NCs) have recently garnered enhanced development efforts from research disciplines owing to their superior optical and optoelectronic properties. These materials, however, are unlike conventional quantum dots, because they possess strong ionic character, labile ligand coverage, and overall stability issues. As a result, the system as a whole is highly dynamic and can be affected by slight changes of particle surface environment. Specifically, the surface ligand shell of LHP NCs has proven to play imperative roles throughout the lifetime of a LHP NC. Recent advances in engineering and understanding the roles of surface ligand shells from initial synthesis, through postsynthetic processing and device integration, finally to application performances of colloidal LHP NCs are covered here.

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“…As demonstrated above, the 1D self-assembly process of nanoscale motifs such as micelles has been studied. ,,,,− However, the reverse process, that is, supramolecular depolymerization in which superstructures transform into supramolecular monomers, is far less explored. The complexity and instantaneous change of the supramolecular structures make it difficult to monitor the structural variation, especially the kinetics of supramolecular depolymerization.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Depolymerization of Nanowires Self-Assembled from Micelles

et al. 2020

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Supramolecular polymerization has been a fascinating frontier of supramolecular chemistry in fabricating well-defined hierarchical nanostructures. However, the reverse process, that is, supramolecular depolymerization in which superstructures disassemble into subunits, is far less explored. In particular, the mechanism and kinetics of supramolecular depolymerization have not yet been reported. In this work, we discovered a thermal-induced supramolecular depolymerization of nanowires formed by supramolecular step-growth polymerization of preassembled micelles. With increasing temperature, the intermicelle interaction between the micellar subunits is broken, resulting in depolymerization of the nanowires into micellar subunits. Accompanying the supramolecular depolymerization, chain transfer between the subunits occurs. A theoretical model was proposed to reveal the mechanism and kinetics of the supramolecular depolymerization. It was found that the depolymerization behavior obeys the rules of random depolymerization. The present work could provide useful information for understanding the underlying principles of supramolecular degradation. In addition, the temperature-induced supramolecular depolymerization of hierarchical nanostructures may find potential applications in biomedical fields.

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Cluster-mediated assembly enables step-growth copolymerization from binary nanoparticle mixtures with rationally designed architectures

Abstract: Multicomponent nanoparticle chains structurally analogous to random, block, and alternating copolymers, respectively, have been fabricated by a cluster-mediated self-assembly process.

Cited by 18 publications

References 32 publications

Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr₃ Perovskite Nanocrystals

Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr₃ Perovskite Nanocrystals

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

Supramolecular Depolymerization of Nanowires Self-Assembled from Micelles

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Cluster-mediated assembly enables step-growth copolymerization from binary nanoparticle mixtures with rationally designed architectures

Abstract: Multicomponent nanoparticle chains structurally analogous to random, block, and alternating copolymers, respectively, have been fabricated by a cluster-mediated self-assembly process.

Cited by 18 publications

References 32 publications

Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr3 Perovskite Nanocrystals

Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr3 Perovskite Nanocrystals

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

Supramolecular Depolymerization of Nanowires Self-Assembled from Micelles

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Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr₃ Perovskite Nanocrystals

Cuboidal Supraparticles Self-Assembled from Cubic CsPbBr₃ Perovskite Nanocrystals