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Observation and Analysis of Blinking Surface-enhanced Raman Scattering

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Published on: January 11, 2018

Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy.

Gitchka G Tsutsumanova¹, Neno D Todorov¹, Stoyan C Russev¹

¹Faculty of Physics, Sofia University, 5 James Bourchier Blvd., 1164 Sofia, Bulgaria.

Nanomaterials (Basel, Switzerland)

|December 24, 2021

Summary

Researchers developed cost-effective silver micro- and nanoflowers on aluminum for surface-enhanced Raman scattering (SERS). These flowerlike structures act as plasmonic materials, achieving significant Raman enhancement for detecting low concentrations of rhodamine-6G.

Keywords:

SERS SERS substrates nanocavity resonator nanoflowers surface plasmon

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Area of Science:

Materials Science
Nanotechnology
Plasmonics

Background:

Micro- and nanoflowers possess high surface-to-volume ratios, enabling applications in biosensing, drug delivery, and water purification.
Their irregular surfaces facilitate plasmonic behavior, enabling resonant coupling with optical waves and surface plasmon excitations.
This plasmonic property suggests their potential utility as effective surface-enhanced Raman scattering (SERS) substrates.

Purpose of the Study:

To design and characterize silver flowerlike structures for SERS applications.
To investigate the Raman enhancement properties of these novel SERS substrates.
To establish a simple and cost-effective fabrication method for high-surface-area SERS substrates.

Main Methods:

Fabrication of silver flowerlike structures on an aluminum surface using a cost-effective method.
Characterization of the nanoscale morphology, revealing self-organized quasiperiodic stacks of nanosheets acting as plasmonic cavity resonators.
Testing the SERS performance using rhodamine-6G (R6G) solutions at concentrations ranging from 10^-3 M to 10^-7 M.

Main Results:

A simple and cost-effective fabrication method yielded SERS substrates with a highly developed surface area.
The silver flowers exhibited nanoscale morphology with self-organized quasiperiodic stacks of nanosheets, functioning as plasmonic cavity resonators.
Optimal SERS enhancement factors reaching up to 10⁵ were observed for R6G concentrations between 10^-6 M and 10^-7 M.

Conclusions:

Silver micro- and nanoflowers deposited on aluminum are effective SERS substrates.
The unique morphology of these nanostructures contributes to their plasmonic cavity resonator properties.
The developed fabrication method is suitable for producing high-performance, cost-effective SERS substrates for sensitive molecule detection.