Self‐Assembly of Nanotriangle Superlattices Facilitated by Repulsive Electrostatic Interactions

Walker, David; Browne, Kevin P.; Kowalczyk, Bartłomiej; Grzybowski, Bartosz A.

doi:10.1002/anie.201002558

Cited by 96 publications

(86 citation statements)

References 37 publications

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“…Electrostatic repulsion sometimes dominants self‐assembly processes and facilitates superlattice formation. Grzybowski's group synthesized equilateral triangle gold nanoplates in aqua solution with a side length of 158 ± 14 nm and 8.7 ± 0.8 nm thickness . The van der Waals forces between nanotriangles can be maximized when nanoplates stacked “on top” of one another, which could further be estimated through the Hamaker integral approximation:

E_{vdW} = - A [1 / d^{2} - 2 / {(d + h)}^{2} + 1 / {(d + 2 h)}^{2}] / 12 π

where A is the Hamaker constant and d is the inter‐plate distance, and h is the thickness of the nanoplates.…”

Section: Electrostatic Interactionsmentioning

confidence: 99%

Interparticle Forces Underlying Nanoparticle Self‐Assemblies

Luo

Wang

2015

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Studies on the self-assembly of nanoparticles have been a hot topic in nanotechnology for decades and still remain relevant for the present and future due to their tunable collective properties as well as their remarkable applications to a wide range of fields. The novel properties of nanoparticle assemblies arise from their internal interactions and assemblies with the desired architecture key to constructing novel nanodevices. Therefore, a comprehensive understanding of the interparticle forces of nanoparticle self-assemblies is a pre-requisite to the design and control of the assembly processes, so as to fabricate the ideal nanomaterial and nanoproducts. Here, different categories of interparticle forces are classified and discussed according to their origins, behaviors and functions during the assembly processes, and the induced collective properties of the corresponding nanoparticle assemblies. Common interparticle forces, such as van der Waals forces, electrostatic interactions, electromagnetic dipole-dipole interactions, hydrogen bonds, solvophonic interactions, and depletion interactions are discussed in detail. In addition, new categories of assembly principles are summarized and introduced. These are termed template-mediated interactions and shape-complementary interactions. A deep understanding of the interactions inside self-assembled nanoparticles, and a broader perspective for the future synthesis and fabrication of these promising nanomaterials is provided.

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E_{vdW} = - A [1 / d^{2} - 2 / {(d + h)}^{2} + 1 / {(d + 2 h)}^{2}] / 12 π

where A is the Hamaker constant and d is the inter‐plate distance, and h is the thickness of the nanoplates.…”

Section: Electrostatic Interactionsmentioning

confidence: 99%

Interparticle Forces Underlying Nanoparticle Self‐Assemblies

Luo

Wang

2015

Small

141

123

View full text Add to dashboard Cite

show abstract

“…It follows that nanoplates ordering depends predominantly on repulsive electrostatic interactions between the nanoplates introduced by charged surfactants. 45 One of the main motivations for the preparation of nanoplates arrays is their use in SERS substrates. Figure 7(c) showed the SERS spectra of NBA (Raman report molecule) on monolayer and head-to-head arrays.…”

Section: Controlled Assembly Of Gold Nanoplates For Surface Enhanced mentioning

confidence: 99%

Shape-Controlled Synthesis of Gold Nanoplates and Their Self-Assembly by Repulsive Electrostatic Interactions

Rao²,

Sun³

et al. 2012

j. nanosci. nanotech.

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This study focuses on understanding the growth and control of the gold nanoplates by seed-mediated growth approach. These monodispersive size-controlled gold nanoplates have the average thickness of 8-10 nm and average size tunable from 70 to 150 nm, exhibiting strong surface plasmon absorption in the near infrared (NIR) region. For the gold nanoplates formation, the seeds serve as nucleation sites, ascorbic acid (AA) serves as a new reductant to reduce hydrogen tetrachloroaurate (HAuCl4), surface activity system cetyltrimethylammonium bromide (CTAB) and potassium iodide (KI) are critical factors. X-ray diffraction (XRD) and selected-area electron diffraction (SAED) analyses reveal that gold nanoplates with the (111) lattice plane as the basal plane are single crystals. CTAB are absorbed on the surface of the (111) lattice plane of the single crystals, accounting for self-assembled monolayer and head-to-head arrays. The two arrays have been shown to serve as effective surface-enhanced Raman scattering substrates using Niel blue A (NBA) sulfate as Raman report molecule.

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“…2 Electrostatic forces are particularly relevant for directing self-assembly due to the tunable direction and strength of these forces. 3,4 Top-down methods such as e-beam lithography can be used to fabricate nanoscale electrodes or to create charge patterns on a scaffold, which in turn can direct the self-assembly process. 5,6 These methods offer the promise to create non-periodic nanostructures via directed self-assembly.…”

Section: Introductionmentioning

confidence: 99%

A master-equation approach to simulate kinetic traps during directed self-assembly

Lakerveld

Stephanopoulos

Barton

2012

The Journal of Chemical Physics

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Robust directed self-assembly of non-periodic nanoscale structures is a key process that would enable various technological breakthroughs. The dynamic evolution of directed self-assemblies towards structures with desired geometries is governed by the rugged potential energy surface of nanoscale systems, potentially leading the system to kinetic traps. To study such phenomena and to set the framework for the directed self-assembly of nanoparticles towards structures with desired geometries, the development of a dynamic model involving a master equation to simulate the directed self-assembly process is presented. The model describes the probability of each possible configuration of a fixed number of nanoparticles on a domain, including parametric sensitivities that can be used for optimization, as a function of time during self-assembly. An algorithm is presented that solves large-scale instances of the model with linear computational complexity. Case studies illustrate the influence of several degrees of freedom on directed self-assembly. A design approach that systematically decomposes the ergodicity of the system to direct self-assembly of a targeted configuration with high probability is illustrated. The prospects for extending such an approach to larger systems using coarse graining techniques are also discussed.

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Self‐Assembly of Nanotriangle Superlattices Facilitated by Repulsive Electrostatic Interactions

Cited by 96 publications

References 37 publications

Interparticle Forces Underlying Nanoparticle Self‐Assemblies

Interparticle Forces Underlying Nanoparticle Self‐Assemblies

Shape-Controlled Synthesis of Gold Nanoplates and Their Self-Assembly by Repulsive Electrostatic Interactions

A master-equation approach to simulate kinetic traps during directed self-assembly

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