Self-Assembly of Cobalt Nanoparticle Rings

Tripp, Steven L.; Pusztay, Stephen V.; Ribbe, and Alexander E.; Wei, Alexander

doi:10.1021/ja0263285

Cited by 313 publications

(236 citation statements)

References 25 publications

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“…17). 54,55 The median ring size could be reduced by diluting the dispersion prior to deposition, to produce rings less than 100 nm across. 56 It is interesting to note that smaller Co nanoparticles (d , 15 nm) generally did not participate in ring self-assembly, presumably due to their superparamagnetic nature at room temperature.…”

Section: Self-assembly Of Cobalt Nanoparticle Ringsmentioning

confidence: 99%

“…55 Co nanoparticles deposited from toluene dispersions with minimal surfactant produced only densely packed particle films, indicating that nondirectional vdW forces were predominant. Increasing the amount of 1 produced a more viscous wetting layer, and effectively preserved the nanoparticle rings by immobilizing them at an early stage of the drying process.…”

Section: Self-assembly Of Cobalt Nanoparticle Ringsmentioning

confidence: 99%

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Calixarene‐Encapsulated Nanoparticles: Self‐Assembly into Functional Nanomaterials

Wei

2006

ChemInform

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Calixarenes are excellent surfactants for enhancing the dispersion and self-assembly of metal nanoparticles into well-defined structures, particularly those with unit length scales in the 10-100 nm size range. Particles within these ensembles are strongly coupled, giving rise to unique collective optical or magnetic properties. The self-assembled nanostructures described in this feature article include 2D arrays of colloidal Au nanoparticles with size-dependent plasmonic responses, and sub-100 nm Co nanoparticle rings with chiral magnetic states. These nanoparticle assemblies may be further developed for applications in chemical sensing based on surfaceenhanced Raman scattering (SERS) and as binary elements for nonvolatile memory, respectively.

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Section: Self-assembly Of Cobalt Nanoparticle Ringsmentioning

confidence: 99%

Section: Self-assembly Of Cobalt Nanoparticle Ringsmentioning

confidence: 99%

Calixarene‐Encapsulated Nanoparticles: Self‐Assembly into Functional Nanomaterials

Wei

2006

ChemInform

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“…The requirement of 10-fold higher concentration of the reductant Cys for the dendritic growth supports such hypothesis. Other conditions such as rapidly evaporating films of dispersed NPs, dipole-directed self-assembly and electrostatic interaction, in combination, may also have played a role [15]. It is shown earlier that Ag in the particles readily forms a complex and distributes uniformly with S, if present enough in the reaction and exhibits an absorption band of $300 nm [9].…”

Section: Resultsmentioning

confidence: 98%

“…Discrete cobalt discs, rods and cubes [4], platonic gold nanocrystals [5] and other shapes have been synthesised from solution phase reduction. Many methods have been described for preparation of dendritic silver nanoparticles (NPs) [6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Self-assembly of silver nanoparticles into dendritic flowers from aqueous solution

Swatek

Dong

Shaw

et al. 2010

Journal of Experimental Nanoscience

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Similar to folding of proteins into three-dimensional (3D) structure, self-assembly of metallic nanoparticles (NPs) into dendritic or other supramolecular structures is of greater interest, yet less understood. We observed spontaneous, template-free organisation of silver NPs into 3D, dendritic, elegant, flower-like structures from an aqueous solution containing AgNO 3 and L-cysteine (Cys). The resultant NPs and dendritic structures were characterised using UV-Vis spectroscopy and scanning and transmission electron microscopy. The process initiated most likely by diffusion-limited aggregation in the liquid phase, which were further grown into elegant, dendritic flowers probably by evaporation of residual wetting layer of larger NPs. Electrostatic attraction between -COO À and -NH 3 þ groups of L-Cys on the surface of silver NPs may also have a role in their growth.

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Metal Nanoparticles, Organization & Applications of

Schmid

2005

Encyclopedia of Inorganic Chemistry

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The need to organize metal nanoparticles in three, two, or one dimension(s) is linked with their properties, the use of which is only possible if they are organized. The most important properties of nonmagnetic and magnetic metal nanoparticles are therefore briefly discussed. Organization in three dimensions (3D) may happen by naturally happening crystallization processes or by linking the particles with the help of spacer molecules of various length and composition. 3D organized metal particles are quite well investigated and electron transport between the building blocks is satisfyingly understood. 2D arrangements result either by spontaneous self‐assembly from solution on appropriate supports, by guided self‐assembly, supporting the organization process, for instance, by means of pressure (Langmuir–Blodgett) or pre‐prepared surfaces, or the most attractive kind of organization, the aimed one, since it results in artificial structures that would be necessary if nanoparticles should find application in future nanodevices. Two routes to aimed structures have become known up to now: the dip‐pen nanolithography and the nanoelectrical modification of surfaces. Dip‐pen nanolithography uses the transport of special molecules from a moving AFM tip to suited surfaces. Chemical modifications of as‐prepared structures end up with formation of aimed patterns of metal nanoparticles. Nanoelectrical modification of CH 3 ‐terminated surfaces, also using an AFM tip, give COOH functions that can further be modified to bind metal nanoparticles. Architectures performed by one of these methods simply depend on the software the AFM is moving on the surfaces.

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Self-Assembly of Cobalt Nanoparticle Rings

Cited by 313 publications

References 25 publications

Calixarene‐Encapsulated Nanoparticles: Self‐Assembly into Functional Nanomaterials

Calixarene‐Encapsulated Nanoparticles: Self‐Assembly into Functional Nanomaterials

Self-assembly of silver nanoparticles into dendritic flowers from aqueous solution

Metal Nanoparticles, Organization & Applications of

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