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Controllable Ag nanostructure patterning in a microfluidic channel for real-time SERS systems.

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We developed a microfluidic system to create nanostructured silver thin films for sensitive, real-time biomolecule detection using Surface-Enhanced Raman Spectroscopy (SERS). This low-cost method enables rapid, mass-producible medical and pharmaceutical analysis.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Surface-Enhanced Raman Spectroscopy (SERS) is a powerful technique for detecting trace amounts of analytes.
  • Fabricating reliable and efficient SERS substrates, particularly within microfluidic devices, remains a challenge.
  • Developing cost-effective and scalable methods for producing nanostructured materials for sensing applications is crucial.

Purpose of the Study:

  • To present a novel microfluidic patterning system for fabricating nanostructured silver (Ag) thin films.
  • To demonstrate the immediate utility of these Ag thin films in a real-time SERS sensing system.
  • To optimize the fabrication process for effective SERS detection and real-time biomolecule monitoring.

Main Methods:

  • Utilized a polyol method within a microfluidic system to deposit nanostructured Ag thin films onto channel surfaces.
  • Fabricated Ag-patterned silicon (Si) wafers and polydimethylsiloxane (PDMS) microfluidic channels.
  • Determined optimal sensing regions and fabrication durations for enhanced SERS detection.
  • Integrated the Ag-patterned polymer channel with a glass substrate for microfluidic sensing.

Main Results:

  • Achieved nanostructured Ag thin films with a high SERS enhancement factor (EF) of 4.25 × 10^10.
  • Demonstrated the effectiveness of the patterned Ag thin films as SERS active substrates.
  • Successfully employed the Ag-patterned microfluidic channel for real-time monitoring of biomolecule concentrations.

Conclusions:

  • The microfluidic patterning system offers a low-cost and efficient method for fabricating nanostructured Ag thin films.
  • The fabricated Ag thin films are suitable for immediate use in high-sensitivity, real-time SERS detection.
  • This technology has significant potential for medical and pharmaceutical detection, with capabilities for mass production.