Tunable Plasmonic Silver Nanodomes for Surface-Enhanced Raman Scattering
Date
2018Author
Kahraman, Mehmet and Ozbay, Ayse and Yuksel, Handan and Solmaz, Ramazan
and Demir, Baran and Caglayan, Humeyra
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Surface-enhanced Raman scattering (SERS) is an emerging analytical
method used in biological and non-biological structure characterization.
Since the nanostructure plasmonic properties is a significant factor for
SERS performance, nanostructure fabrication with tunable plasmonic
properties are crucial in SERS studies. In this study, a novel method
for fabrication of tunable plasmonic silver nanodomes (AgNDs) is
presented. The convective-assembly method is preferred for the
deposition of latex particles uniformly on a regular glass slide and
used as a template for polydimethylsiloxane (PDMS) to prepare nanovoids
on a PDMS surface. The obtained nanovoids on the PDMS are used as a mold
for AgNDs fabrication. The nanovoids are filled with Ag deposition by
the electrochemical method to obtain metallic AgNDs. Scanning electron
microscopy (SEM) and atomic force microscopy (AFM) are used for
characterization of the structural properties of all fabricated AgNDs.
The optical properties of AgNDs are characterized with the evaluation of
SERS activity of 4-aminothiphonel and rhodamine 6G. In addition to
experimental characterizations, the finite difference time domain (FDTD)
method is used for the theoretical plasmonic properties calculation of
the AgNDs. The experimental and theoretical results show that the SERS
performance of AgNDs is strongly dependent on the heights and diameters
of the AgNDs.
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