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Surface assembly and plasmonic properties in strongly coupled segmented gold nanorods.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gupta, Maneesh K. König, Tobias Near, Rachel Nepal, Dhriti Drummy, Lawrence F. Biswas, Sushmita Naik, Swati Vaia, Richard A. El-Sayed, Mostafa A. Tsukruk, Vladimir V.
Description	Country affiliation: United States Author Affiliation: Gupta MK ( School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, GA 30332, USA.)
Abstract	An assembly strategy is reported such that segmented nanorods fabricated through template-assisted methods can be robustly transferred and tethered to a pre-functionalized substrate with excellent uniformity over large surface areas. After embedding the rods, sacrificial nickel segments were selectively etched leaving behind strongly coupled segmented gold nanorods with gaps between rods below 40 nm and as small as 2 nm. Hyper-spectral imaging is utilized to measure Rayleigh scattering spectra from individual and coupled nanorod elements in contrast to common bulk measurements. This approach discerns the effects of not only changing segment and gap size but also the presence of characteristic defects on the plasmonic coupling between closely spaced nanorods. Polarized hyper-spectral measurements are conducted to provide direct observation of the anisotropic plasmonic resonance modes in individual and coupled nanorods, which are close to those predicted by computer simulations for nanorods with ideal shapes. Some common deviations from ideal shape such as non-flat facets and asymmetric tails are demonstrated to result in the appearance of characteristic plasmon resonances, which have not been considered before. The large-scale assembly of coupled noble nanostructures with fine control over geometry and high uniformity provides means to strongly tune the scattering, absorption, and near-field plasmonic properties through the geometric arrangement of precisely controlled nanorod segments.
File Format	HTM / HTML
ISSN	16136810
Issue Number	17
Journal	Small
Volume Number	9
e-ISSN	16136829
Language	English
Publisher	Wiley-VCH
Publisher Date	2013-09-09
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Nanotechnology Gold Chemistry Metal Nanoparticles Nanostructures Surface Plasmon Resonance Journal Article Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Medicine Biomaterials Engineering Biotechnology

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