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Thickness-Tunable PDMS-Based SERS Sensing Substrates.

Diego P Pacherrez Gallardo1, Shu Kawamura2, Ryo Shoji2

  • 1School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA.

Sensors (Basel, Switzerland)
|May 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for creating flexible, thin surface-enhanced Raman scattering (SERS) substrates using polydimethylsiloxane (PDMS) diluted with decamethylcyclopentasiloxane (D5). This advancement enables highly sensitive SERS detection on adaptable polymeric platforms.

Keywords:
decamethylcyclopentasiloxane (D5)polydimethylsiloxane (PDMS)surface-enhanced Raman scattering (SERS)

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Surface-enhanced Raman scattering (SERS) offers ultra-sensitive molecular detection.
  • Polydimethylsiloxane (PDMS) is suitable for bio-compatible sensing but its high viscosity limits device flexibility.
  • Conventional PDMS-SERS substrates are thick and stiff, hindering flexible micro/nano device development.

Purpose of the Study:

  • To develop a method for fabricating thin, flexible PDMS-based SERS substrates.
  • To enable the integration of SERS capabilities onto adaptable polymeric platforms.
  • To overcome the limitations of conventional PDMS viscosity for advanced sensor engineering.

Main Methods:

  • Utilized decamethylcyclopentasiloxane (D5) as a diluent to reduce PDMS viscosity.
  • Controlled film thickness via D5/PDMS ratio and spin-coating speed, achieving down to 100 nm.
  • Leveraged unsaturated Si-H bonds in PDMS curing agent for in-situ silver nanoparticle (AgNP) formation.
  • Optimized AgNP size and density by adjusting reaction temperature and time.

Main Results:

  • Successfully fabricated thin PDMS films with tunable thickness.
  • Achieved uniform deposition of AgNPs directly bonded to the PDMS substrate.
  • Demonstrated strong SERS performance with Rhodamine 6G (R6G).
  • Attained a low detection limit of 0.1 ppm due to plasmonic enhancement from AgNPs.

Conclusions:

  • The D5-diluted PDMS method yields flexible and thin SERS substrates.
  • This approach facilitates the creation of advanced, bio-compatible SERS sensors.
  • The developed substrates show high sensitivity and potential for various analytical applications.