Electrofluidynamic Patterning of Tailorable Nanostructured Substrates for Surface-Enhanced Raman Scattering

Area of Science:

• Nanotechnology
• Spectroscopy
• Materials Science

Background:

• Surface-enhanced Raman spectroscopy (SERS) is promising for portable diagnostics, but challenges remain in creating cost-effective, high-performance 3D substrates.
• Existing methods struggle to simultaneously achieve high sensitivity, reproducibility, tunability, multiplexity, and integratability for rapid sensing.

Purpose of the Study:

• To develop a novel technique for fabricating advanced 3D SERS substrates.
• To overcome limitations in current SERS substrate manufacturing for portable diagnostic applications.

Main Methods:

• Utilized electrofluidodynamic patterning (EFDP) for high-throughput, nanometer-resolution fabrication of SERS-active topographic morphologies.
• Employed spatial and lateral modulation of dielectric discontinuity and electric fields to control nanostructure formation.
• Developed gold-coated pillars that act as individual sensing units, leveraging surface plasmon coupling for enhanced Raman signals.

Main Results:

• EFDP technique successfully produced 3D nanoarchitectures with controllable SERS enhancement.
• Fabricated substrates demonstrated high sensitivity, reproducibility, and tunable dimensions.
• The process allows for low-cost, large-scale manufacturing suitable for integration into lab-on-a-chip devices.

Conclusions:

• The EFDP technique offers a viable solution for producing high-performance, cost-effective 3D SERS substrates.
• This advancement facilitates the development of next-generation portable diagnostic tools.
• The developed nanomaterials and nanospectroscopic systems pave the way for diverse chemical and biological sensing applications.