A class of porous metallic nanostructures

Velev, Orlin D.; Tessier, Peter M.; Lenhoff, Abraham M.; Kaler, Eric W.

doi:10.1038/44065

Cited by 499 publications

(349 citation statements)

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“…Several methods, e.g. gravity sedimentation [4][5][6] and capillary force at a meniscus between a substrate and the spheres colloidal solution [7][8][9][10][11], were used for assembling the spheres into templates. After the formation of the templates, the interstitials spaces are then impregnated with the desired precursors.…”

Section: Introductionmentioning

confidence: 99%

Surface enhanced raman scattering of aromatic thiols adsorbed on nanostructured gold surfaces

Abdelsalam

2009

Open Chemistry

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Abstract:In this paper we describe the use of a simple and versatile technique of templated electrodeposition through polystyrene sphere templates to produce nanostructured films of gold with regular submicron spherical holes arranged in a hexagonal close-packed structure. The templates were produced by self assembly of a monodispersed suspension of polystyrene spheres on gold substrates using capillary forces. The self assembly process was modified through the chemical modification of the gold substrate with cysteamine thiol. Films of gold were prepared by electrochemical deposition through the template. The electrochemical deposition charge and the current time curve were used to control the film height with a precision of approximately 10 nm. The colour of the nanostructured films changed as the film thickness was changed. Surface enhanced Raman Scattering spectra were recorded and used to identify very low concentrations of aromatic thiol molecules, 4-Nitrobenzenethiol (4-NBT) and 4-Aminobenzenethiol (4-ABT), adsorbed on the surface of the nanostructured gold substrates.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Section: Introductionmentioning

confidence: 99%

Surface enhanced raman scattering of aromatic thiols adsorbed on nanostructured gold surfaces

Abdelsalam

2009

Open Chemistry

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“…While powerful, these methods, respectively, are limited to small scales, require external electric fields, are not easily reversible, or have to date only yielded two-dimensional patterning. More useful for applications such as adaptive optics 7,8 or reconfigurable circuit elements 9 with conductive functionalities 10 would be an assembly method in which a three-dimensional colloidal crystal could not only be switched on and off in time, but could also be simultaneously controlled in space, on the micron scale, without the restriction of fixed surface features such as electrodes [11][12][13] and templates [14][15][16] .…”

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confidence: 99%

Spatially and temporally reconfigurable assembly of colloidal crystals

2014

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The self-assembly of colloidal crystals is important to the production of materials with functional optical, mechanical and conductive properties. Yet, self-assembly methods are limited by their slow kinetics and lack of structural control in space and time. Refinements such as templating and directed assembly partially address the problem, albeit by introducing fixed surface features such as templates or electrodes. A template-free method to reconfigure colloidal crystals simultaneously in three-dimensional space and time would better align work in colloidal assembly with materials applications. Here, we report a photo-induced assembly method that yields regions either filled with colloidal crystals or completely devoid of colloids. The origin of the effect is found to be electrophoresis of colloids generated by photochemistry at an indium tin oxide-coated substrate. Simple optical manipulations are applied to reconfigure these assembly and depletion regions. Thus, the method represents a new kind of template-free, reconfigurable three-dimensional photolithography.

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“…For example, monodisperse polymer particles can be laid down into an ordered array and the interstitial space filled with colloidal metal particles (66)(67)(68)', the monodisperse polymer particles are then dissolved away, leaving a porous metallic substrate with well-defined pore sizes. Monodisperse polymer colloid templates have also been studied as a spacer layer in liquid crystal displays (69).…”

Section: Applications Of Polymer Colloidsmentioning

confidence: 99%