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Raman Signal Enhancement by Quasi-Fractal Geometries of Gold Nanoparticles

preprint
submitted on 27.02.2018 and posted on 28.02.2018 by Richard Darienzo, Tatsiana Mironava, Rina Tannenbaum

The synthesis of star-like gold nanoparticles (SGNs) in a temperature-controlled environment allows for temperature modulation and facilitates the growth of highly branched nanoparticles. By increasing the synthesis temperature, the level of branching increases as well. These highly branched features represent a distinctly novel, quasi-fractal nanoparticle morphology, referred to herein as gold nano caltrops (GNC). The increased surface roughness, local curvature and degree of inhomogeneity of GNC lend themselves to generating improved enhancement of the scattering signals in surface-enhanced Raman spectroscopy (SERS) via a mechanism in which the localized surface plasmon sites, or “hot spots,” provide the engine for the signal amplification, rather than the more conventional surface plasmon. Here, the synthesis procedure and the surface-enhancing capabilities of GNC are described and discussed in comparison with SGN.


History

Email Address of Submitting Author

irena.tannenbaum@stonybrook.edu

Email Address(es) for Other Author(s)

richard.darienzo@stonybrook.edu taniamironova@gmail.com

Institution

Stony Brook University

Country

USA

ORCID For Submitting Author

0000-0001-9389-045X

Declaration of Conflict of Interest

No conflict of interest

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