Novel monolayer and bilayer shell aggregate gold nanostructures

Myria Angelidou; Costas Pitris

doi:10.1117/12.873297

11 February 2011 Novel monolayer and bilayer shell aggregate gold nanostructures

Myria Angelidou, Costas Pitris

Proceedings Volume 7911, Plasmonics in Biology and Medicine VIII; 791114 (2011) https://doi.org/10.1117/12.873297
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

Various gold nanostructures are being investigated for medical and biological uses. For many medical applications, it would be beneficial to use near infrared (NIR) excitation as well as small gold nanospheres which can easily reach the cytoplasm and cell nucleus. For that purpose, we propose a novel nanostructure, the "shell aggregate," which consists of small nanospheres aggregated around a core such as an intracellular organelle. The extinction efficiency of such monolayfer and bilayer shell aggregates is thoroughly investigated with appropriate simulations using the Descrete Dipole Approximation (DDA) method. This technique can deal with any arbitrary size, shape, synthesis and external environment. The effect of parameters such as the overall radius of the nanostructure, the small nanosphere radius, and the distance between the nanospheres, on the extinction efficiency factor of the nanostructures was examined. The results indicate that the extinction spectra appear to depend heavily on the distance between the small nanospheres. Finally, the monolayer shell aggregate could be a suitable candidate for use in various biological, intracellular, applications since it provides a reasonably tunable plasmon resonance wavelength while the small size of its components can be exploited for intracellular distribution.

Citation Download Citation

Myria Angelidou and Costas Pitris "Novel monolayer and bilayer shell aggregate gold nanostructures", Proc. SPIE 7911, Plasmonics in Biology and Medicine VIII, 791114 (11 February 2011); https://doi.org/10.1117/12.873297

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KEYWORDS

Nanostructures

Gold

Near infrared

Refractive index

Dielectrics

Electrons

Scattering

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