Self-Assembly of Colloidal Hexagonal Bipyramid- and Bifrustum-Shaped ZnS Nanocrystals into Two-Dimensional Superstructures

Stam, Ward van der; Gantapara, Anjan P.; Akkerman, Quinten A.; Soligno, Giuseppe; Meeldijk, Johannes D.; Roij, René van; Dijkstra, Marjolein; Donegá, Celso de Mello

doi:10.1021/nl4046069

Cited by 80 publications

(94 citation statements)

References 52 publications

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“…Nanoscale cation exchange (CE) offers a versatile alternative for direct‐synthesis protocols, as it allows for postsynthetic control over the NC composition, while preserving the size and shape of the parent NCs . Colloidal Cu 2− x A NCs, prepared by direct‐synthesis protocols, are often used as parent (template) NCs in CE reactions to yield other metal chalcogenide NCs . In this way, the size and shape control already achieved for Cu 2− x A NCs can be translated to other metal chalcogenides.…”

Section: Binary Copper Chalcogenidesmentioning

confidence: 99%

Prospects of Colloidal Copper Chalcogenide Nanocrystals

2016

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Over the past few years, colloidal copper chalcogenide nanocrystals (NCs) have emerged as promising alternatives to conventional Cd and Pb chalcogenide NCs. Owing to their wide size, shape, and composition tunability, Cu chalcogenide NCs hold great promise for several applications, such as photovoltaics, lighting and displays, and biomedical imaging. They also offer characteristics that are unparalleled by Cd and Pb chalcogenide NCs, such as plasmonic properties. Moreover, colloidal Cu chalcogenide NCs have low toxicity, potentially lower costs, and excellent colloidal stability. This makes them attractive materials for the large-scale deployment of inexpensive, sustainable, and environmentally benign solution-processed devices. Nevertheless, the synthesis of colloidal Cu chalcogenide NCs, especially that of ternary and quaternary compositions, has yet to reach the same level of mastery as that available for the prototypical Cd chalcogenide based NCs. This review provides a concise overview of this rapidly advancing field, sketching the state of the art and highlighting the key challenges. We discuss recent developments in the synthesis of size-, shape-, and composition-controlled NCs of Cu chalcogenides, with emphasis in strategies to circumvent the limitations arising from the need to precisely balance the reactivities of multiple precursors in synthesizing ternary and quaternary compositions. In this respect, we show that topotactic cation-exchange reactions are a promising alternative route to complex multinary Cu chalcogenide NCs and hetero-NCs, which are not attainable by conventional routes. The properties and potential applications of Cu chalcogenide NCs and hetero-NCs are also addressed.

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Section: Binary Copper Chalcogenidesmentioning

confidence: 99%

Prospects of Colloidal Copper Chalcogenide Nanocrystals

2016

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“…It is widely believed that the driving force behind this irreversible adsorption is the reduction in the interfacial energy due to contact between the two immiscible fluids. Based on this principle, many analytical models [2]- [4], [22]- [24] have been developed to capture the orientational behavior of isolated NPs at sharp (zero thickness) fluid-fluid interfaces. For example, Evers et al [2] predict that the most preferred orientation of a cubic NP at the interface is {110} facet up.…”

Section: Introductionmentioning

confidence: 99%

Modeling the orientational and positional behavior of polyhedral nanoparticles at fluid-fluid interfaces

Gupta

Hanrath

Escobedo

2017

Phys. Rev. Materials

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Using Molecular Dynamics simulations to explicitly model fluid molecules, we study the effect of solvent wetting on the behavior of polyhedral nanoparticles at a fluid-fluid interface. First, we quantify the positional and orientational free energy characteristics of an isolated nanoparticle. Our results suggest that the thickness of the interface can introduce non-trivial effects on the preferential particle orientations. A continuum model is proposed to account for the finite interfacial mixing region, and a qualitative comparison between the two approaches is presented. We examine the effect on the free energy of the system of changes in the particle's solvation preference towards one fluid, and the degree of miscibility between the two fluids. By tuning these interaction parameters, we can potentially access and favor different orientations for the particle shapes examined. Further, we extend the insights gained from single particle analyses to the attachment of two particles. Our results reveal conditions that can drive the assembly of Cuboctahedra into either 2D Puckered Honeycomb lattices or linear rod-like structures.iii BIOGRAPHICAL SKETCH

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“…[26][27][28][29][30]. In recent works, [31][32][33][34][35][36] the equilibrium configuration of such a colloidal particle has been studied theoretically, neglecting however the capillary deformations. This study is a step towards understanding the role of capillary deformations for such non-trivial geometries.…”

Section: Introductionmentioning

confidence: 99%

The equilibrium shape of fluid-fluid interfaces: Derivation and a new numerical method for Young’s and Young-Laplace equations

Soligno

Dijkstra

Roij

2014

The Journal of Chemical Physics

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Articles you may be interested inMany physical problems require explicit knowledge of the equilibrium shape of the interface between two fluid phases. Here, we present a new numerical method which is simply implementable and easily adaptable for a wide range of problems involving capillary deformations of fluid-fluid interfaces. We apply a simulated annealing algorithm to find the interface shape that minimizes the thermodynamic potential of the system. First, for completeness, we provide an analytical proof that minimizing this potential is equivalent to solving the Young-Laplace equation and the Young law. Then, we illustrate our numerical method showing two-dimensional results for fluid-fluid menisci between vertical or inclined walls and curved surfaces, capillary interactions between vertical walls, equilibrium shapes of sessile heavy droplets on a flat horizontal solid surface, and of droplets pending from flat or curved solid surfaces. Finally, we show illustrative three-dimensional results to point out the applicability of the method to micro-or nano-particles adsorbed at a fluid-fluid interface. C 2014 AIP Publishing LLC.[http://dx

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Self-Assembly of Colloidal Hexagonal Bipyramid- and Bifrustum-Shaped ZnS Nanocrystals into Two-Dimensional Superstructures

Cited by 80 publications

References 52 publications

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Prospects of Colloidal Copper Chalcogenide Nanocrystals

Modeling the orientational and positional behavior of polyhedral nanoparticles at fluid-fluid interfaces

The equilibrium shape of fluid-fluid interfaces: Derivation and a new numerical method for Young’s and Young-Laplace equations

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