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Light-Trapping SERS Substrate with Regular Bioinspired Arrays for Detecting Trace Dyes.

Xuan Jin1, Qunyan Zhu2, Lei Feng3

  • 1The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.

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Summary

This study introduces an advanced light-trapping Surface-Enhanced Raman Scattering (SERS) substrate using ordered silicon micropyramids and silver nanobowls. This novel bioinspired compound-eye structure achieves ultra-sensitive, repeatable detection of molecules, including simultaneous dye analysis in food.

Keywords:
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Area of Science:

  • Nanotechnology
  • Materials Science
  • Spectroscopy

Background:

  • Surface-Enhanced Raman Scattering (SERS) substrates often lack ordered structures, hindering signal repeatability and theoretical analysis.
  • Existing SERS substrates combining silicon micropyramids and noble metals have limitations due to the disordered nature of micropyramids.

Purpose of the Study:

  • To develop an ordered, light-trapping SERS substrate with enhanced sensitivity and repeatability.
  • To investigate the contribution of antireflective silicon micropyramids to Raman signal enhancement.
  • To demonstrate the substrate's capability for quantitative and qualitative trace analysis, including simultaneous detection of multiple dyes.

Main Methods:

  • Fabrication of ordered silicon micropyramids using nanosphere lithography and anisotropy wet etching.
  • Assembly of silver nanobowls onto ordered micropyramids via liquid-solid interface self-assembly and transfer, creating a bioinspired compound-eye structure.
  • Characterization of the SERS substrate and evaluation of its performance using Rhodamine 6G (R6G) and multiple food dyes.

Main Results:

  • Successfully fabricated ordered micropyramids with strong light-trapping capabilities.
  • Developed a bioinspired SERS substrate with a compound-eye structure exhibiting excellent light-trapping and plasmonic properties.
  • Achieved ultra-sensitive detection of R6G down to 10-13 M (single-molecule level) with high repeatability (RSD of 3.68%).
  • Demonstrated the significant contribution of antireflective silicon micropyramids to Raman enhancement.
  • Successfully performed simultaneous trace detection of four common dyes (R6G, CV, MG, MB) in food samples.

Conclusions:

  • The novel bioinspired SERS substrate offers superior performance compared to previous designs.
  • The ordered micropyramid structure and antireflective properties are crucial for enhanced SERS sensitivity and repeatability.
  • This substrate shows significant potential for applications in optical sensing, particularly for trace analysis in food safety.