Silver Nanopillar Arrayed Thin Films with Highly Surface-Enhanced Raman Scattering for Ultrasensitive Detection

Area of Science:

• Nanotechnology
• Biomimetics
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) offers high sensitivity for detecting trace molecules.
• Current SERS substrates often rely on complex and expensive micro-nanofabrication processes.
• The cost of SERS substrate fabrication hinders widespread commercialization.

Purpose of the Study:

• To develop a cost-effective and highly sensitive SERS substrate.
• To utilize a biomimetic approach for SERS substrate and mask fabrication.
• To overcome the limitations of traditional artificial SERS architectures.

Main Methods:

• Fabrication of silver-coated nanopillar arrays on a cicada wing.
• Utilizing the cicada wing as both a SERS substrate and a mask.
• Employing template transfer nanoimprint for mask fabrication.
• Testing the substrate with rhodamine 6G (R6G) as a model molecule.

Main Results:

• Achieved dramatically increased SERS signals due to near-field plasmon resonance coupling.
• Obtained an analytical enhancement factor exceeding 10⁸.
• Demonstrated reliable detection of R6G at concentrations of 100 pM or less.

Conclusions:

• The biomimetic SERS substrate provides a cost-effective and highly sensitive solution.
• This approach offers a promising route for the commercialization of SERS technology.
• The developed method simplifies SERS substrate and mask fabrication.