An Energy Investigation into 1D/2D Oriented‐Attachment Assemblies of 1D Ag Nanocrystals

Lv, Weiqiang; Yang, Xuemei; Wang, Wei; Niu, Yinghua; Liu, Zhongping; He, Weidong

doi:10.1002/cphc.201402150

Cited by 22 publications

(29 citation statements)

References 60 publications

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“…Aside from accuracy concerns, it is worth noting that the overall attractive rod-rod interaction becomes stronger for larger nanorods. 44 This increased attraction may not increase reaction rates, however, as we expect that larger nanorods exhibit an overall larger repulsive solvation force. Nonetheless, from analyzing experimental data, there is no clear trend for the effect of size on coalescence orientation.…”

Section: Modeling Of Nanoparticle Attachmentmentioning

confidence: 96%

Understanding the Role of Solvation Forces on the Preferential Attachment of Nanoparticles in Liquid

Welch¹,

Woehl²,

Park

et al. 2015

ACS Nano

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Optimization of colloidal nanoparticle synthesis techniques requires an understanding of underlying particle growth mechanisms. Non-classical growth mechanisms are particularly important as they affect nanoparticle size and shape distributions which in turn influence functional properties. For example, preferential attachment of nanoparticles is known to lead to the formation of mesocrystals, although the formation mechanism is currently not well understood. Here we employ in situ liquid cell scanning transmission electron microscopy (STEM) and steered molecular dynamics (SMD) simulations to demonstrate that the experimentally observed preference for end-to-end attachment of silver nanorods is a result of weaker solvation forces occurring at rod ends. SMD reveals that when the side of a nanorod approaches another rod, perturbation in the surface bound water at the nanorod surface creates significant energy barriers to attachment. Additionally, rod morphology (i.e. facet shape) effects can explain the majority of the side attachment effects that are observed experimentally.

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Section: Modeling Of Nanoparticle Attachmentmentioning

confidence: 96%

Understanding the Role of Solvation Forces on the Preferential Attachment of Nanoparticles in Liquid

Welch¹,

Woehl²,

Park

et al. 2015

ACS Nano

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“…The exact pathway for attachment can be affected by a number of factors, including the surfactant [33][34][35] and solvent [36,37] involved in a synthesis, the initial contact angle, [36,38] and the intrinsic properties of the building blocks. [39][40][41][42] After coalescence, the elimination of attachment interface and smoothing of surface can be achieved through self-recrystallization (or self-integration) because of the variation in chemical potential across the surface. [43] It is worth noting that OA is a growth pathway different from Ostwald ripening (OR), another mechanism commonly involved in the synthesis of metal nanostructures.…”

Section: General Conceptmentioning

confidence: 99%

Oriented Attachment: A Unique Mechanism for the Colloidal Synthesis of Metal Nanostructures

2022

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Rational synthesis of nanostructures with desired properties critically depends on our understanding of the growth mechanism. In addition to the traditional mechanism involving atomic addition, oriented attachment (OA) has received increasing attention in recent years. Employing nanocrystallites as building blocks, OA offers an important route to anisotropic growth, inclusion of defects, and formation of nanostructures with branched morphology. With a focus on metals, here we offer a brief account of recent progress in understanding OA and how it can be adapted for the colloidal synthesis of nanostructures with diverse compositions and morphologies. We start with a discussion on the current understanding of OA based on computational simulations and experimental studies, followed by typical examples of metal nanostructures produced through OA. Finally, we showcase the catalytic and plasmonic applications enabled by those nanostructures, together with perspectives on the challenges and opportunities.

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“…13,14 Columbic repulsion can prevent the attachment of approaching nanoparticles. 8,16,17 Although relevant in semiconductor nanoparticles, dipolar interactions between metal nanoparticles are negligible in most cases as long lived dipoles are unlikely in metals due to their free electron clouds. Zeta (z) potential measurements can be used as an indicator of surface charge.…”

Section: Classical Overgrowth Versus Attachment-based Growthmentioning

confidence: 99%

Attachment-based growth: building architecturally defined metal nanocolloids particle by particle

Ataee‐Esfahani

Skrabalak

2015

RSC Adv.

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Recent mechanistic insight into the synthesis of metal nanostructures by attachment-based growth is highlighted in this review. From quasi-spherical particles to nanowires, nanodendrites, and heterostructures built from nanoparticles as primary building blocks, the principles of oriented and misoriented attachment of metal nanoparticles are discussed within the context of diverse synthetic conditions. From this survey, a greater understanding of this growth mechanism emerges to provide general, and potentially greener, principles for the synthesis of advanced metal nanostructures, including those with applications in catalysis. Fig. 5 TEM images of (a) spherical Pd nanocrystals obtained by heating Pd(acac) 2 in TOP and oleylamine, (b) Pd nanodendrites prepared by heating Pd(hfac) 2 in oleylamine, and (c) Pd bundles formed by heating Pd(acac) 2 in oleylamine. (Adapted with permission from ref. 50.

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An Energy Investigation into 1D/2D Oriented‐Attachment Assemblies of 1D Ag Nanocrystals

Cited by 22 publications

References 60 publications

Understanding the Role of Solvation Forces on the Preferential Attachment of Nanoparticles in Liquid

Understanding the Role of Solvation Forces on the Preferential Attachment of Nanoparticles in Liquid

Oriented Attachment: A Unique Mechanism for the Colloidal Synthesis of Metal Nanostructures

Attachment-based growth: building architecturally defined metal nanocolloids particle by particle

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