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Fabrication of polydimethylsiloxane (PDMS)-Based Flexible Surface-Enhanced Raman Scattering (SERS) Substrate for Ultrasensitive Detection

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Published on: November 17, 2023

A facile chemical approach for preparing a SERS active silver substrate.

Cheng Yang¹, Yu-Tao Xie, Matthew M F Yuen

¹Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China. yangch@ust.hk meymf@ust.hk

Physical Chemistry Chemical Physics : PCCP

|October 1, 2010

Summary

Researchers developed a new silver substrate for surface-enhanced Raman scattering (SERS) by iodinating silver foil. This SERS substrate shows a 29-fold signal enhancement for Rhodamine 6G after 24 hours of self-evolution.

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Area of Science:

Materials Science
Analytical Chemistry
Spectroscopy

Background:

Surface-enhanced Raman scattering (SERS) requires highly efficient substrates.
Developing novel, cost-effective SERS substrates is crucial for sensitive chemical detection.

Purpose of the Study:

To create a novel, self-evolving silver substrate for enhanced SERS applications.
To characterize the substrate's morphology and optical properties during its self-evolution process.

Main Methods:

Preparation of a silver substrate via iodination of evaporated silver foil.
Monitoring substrate morphology and UV-vis absorption during self-evolution.
Evaluating SERS enhancement efficiency using Rhodamine 6G as a probe molecule.

Main Results:

The iodinated silver substrate undergoes a self-evolution process.
UV-vis absorption and AFM topography showed changes during evolution.
A maximum SERS enhancement factor of approximately 29-fold was achieved for Rhodamine 6G after 24 hours of evolution.

Conclusions:

The iodination method provides a feasible route to produce efficient, self-evolving SERS silver substrates.
The substrate's performance is time-dependent, reaching optimal enhancement after 24 hours.
This approach offers potential for scalable production of high-performance SERS substrates.