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Fabrication of polydimethylsiloxane (PDMS)-Based Flexible Surface-Enhanced Raman Scattering (SERS) Substrate for Ultrasensitive Detection
Published on: November 17, 2023
Surface-enhanced Raman scattering from an etched polymer substrate.
1Department of Chemistry, University of Florida, P.O. Box 110702, Gainesville, Florida 32611.
Analytical Chemistry
|June 7, 2011
Summary
This study introduces etched polymer as a cost-effective substrate for Surface-Enhanced Raman Spectroscopy (SER) analysis, achieving high sensitivity and low variability for detecting various analytes.
Area of Science:
- Materials Science
- Analytical Chemistry
- Spectroscopy
Background:
- Surface-Enhanced Raman Spectroscopy (SER) is a powerful analytical technique.
- Developing robust and cost-effective substrates is crucial for routine SER analysis.
- Existing substrates like crossed gratings and quartz wafers have limitations.
Purpose of the Study:
- To evaluate etched poly(ethylene terephthalate) (PET) as a novel substrate for SER analysis.
- To compare the performance of etched PET with traditional SER substrates.
- To explore methods for enhancing SER performance on polymer substrates.
Main Methods:
- Etched poly(ethylene terephthalate) (PET) sheets were prepared.
- Silver nanoparticles were deposited onto PET using chemical reduction, sputtering, and vapor deposition.
- The substrates were tested for SER analysis using crystal violet and other analytes.
- Enhancement factors, linearity, limits of detection, and variability were measured.
Main Results:
- Etched PET substrates demonstrated performance comparable to crossed gratings and quartz wafers.
- Enhancement factors ranged from 10^4 to over 10^5.
- Linearity up to three orders of magnitude was achieved with detection limits around 5 pg.
- Variability was consistently below 20% relative standard deviation (RSD).
- A thin water film enhanced SER signals beyond dry substrate capabilities.
Conclusions:
- Etched polymer, specifically PET, is a viable and cost-effective substrate for routine SER analysis.
- The developed method offers high sensitivity, good linearity, and low variability.
- Further enhancements are possible with the addition of a liquid analyte layer.
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