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Arrayed nanopore silver thin films for surface-enhanced Raman scattering.

Weiwei Zhang1,2, Qingkun Tian1, Zhanghua Chen1

  • 1Centre for Modern Physics Technology, School of Mathematics and Physics, University of Science and Technology, Beijing Xueyuan Road 30, Haidian District Beijing 100083 China songyj@ustb.edu.cn.

RSC Advances
|May 6, 2022
PubMed
Summary
This summary is machine-generated.

Arrayed nanoporous silver thin films on PMMA and PDMS substrates show enhanced surface-enhanced Raman scattering (SERS) signals. These novel substrates achieve a low detection limit and high enhancement factor, enabling sensitive label-free biomolecular detection.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Surface-enhanced Raman scattering (SERS) relies on active substrates for signal amplification.
  • Nanoporous silver thin films on anodic aluminum oxide (AAO) offer potential for SERS applications due to their unique structures and electromagnetic field enhancement.
  • Fabrication of uniform, large-area nanoporous films with controlled morphology is essential for consistent SERS performance.

Purpose of the Study:

  • To develop and characterize novel SERS substrates by transferring nanoporous silver thin films onto flexible polymer substrates (PMMA and PDMS).
  • To investigate the influence of pore size on SERS performance for these new substrates.
  • To evaluate the sensitivity and enhancement capabilities of the fabricated SERS substrates for molecular detection.

Main Methods:

  • Fabrication of arrayed nanoporous silver thin films on AAO templates by precisely controlling sputtering parameters.
  • Transfer of nanoporous silver films onto polymethylmethacrylate (PMMA) and polydimethylsiloxane (PDMS) substrates using a template-assisted sol-gel phase inverse-imprinting process.
  • Evaluation of SERS performance using Rhodamine 6G (R6G) as a model molecule, analyzing detection limits and enhancement factors (EF).

Main Results:

  • Successfully fabricated Ag nanoporous thin films on PMMA and PDMS substrates exhibiting significantly enhanced SERS signals.
  • Observed opposite pore size-dependent SERS tendencies for the PMMA and PDMS substrates, attributed to varying electric field enhancements around different pore diameters.
  • Achieved a low R6G detection limit of 10⁻⁶ mol L⁻¹ and an SERS EF exceeding 10⁶ for the Ag nanoporous thin film on PMMA.

Conclusions:

  • The developed Ag nanoporous thin films on PMMA and PDMS serve as highly sensitive SERS substrates.
  • The pore size-dependent SERS behavior highlights the importance of structural control for optimizing substrate performance.
  • These substrates demonstrate significant potential for label-free detection of biomolecules and single-molecule sensing applications.