Large-Area, Highly Sensitive SERS Substrates with Silver Nanowire Thin Films Coated by Microliter-Scale Solution...

Area of Science:

• Materials Science
• Nanotechnology
• Spectroscopy

Background:

• Surface-enhanced Raman spectroscopy (SERS) requires optimized substrates for enhanced signal detection.
• Fabricating uniform and reproducible SERS substrates over large areas remains a challenge.

Purpose of the Study:

• To develop a scalable and cost-effective method for producing high-performance SERS substrates.
• To investigate the relationship between film morphology and SERS performance.

Main Methods:

• A microliter-scale solution process involving meniscus dragging was employed to deposit silver nanowire (AgNW) films onto gold substrates.
• Experimental parameters were controlled to tune the hot spot density and optical properties of the AgNW films.

Main Results:

• Large-area, uniform AgNW films with controlled cross-linking were successfully fabricated.
• The AgNW films exhibited tunable optical properties dependent on hot spot density.
• The fabricated films demonstrated excellent performance as SERS substrates, showing substantial electromagnetic field enhancement and good reproducibility.

Conclusions:

• The developed microliter-scale solution process is a viable method for producing uniform AgNW films for SERS applications.
• The AgNW films on Au substrates offer a promising platform for sensitive and reproducible SERS detection.