Fast electrically assisted regeneration of on-chip SERS substrates

Area of Science:

• Analytical Chemistry
• Materials Science
• Nanotechnology

Background:

• Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for molecular detection.
• Stationary SERS substrates often suffer from adsorption and memory effects, limiting consecutive measurements.
• Microfluidic systems offer precise control for chemical analysis.

Purpose of the Study:

• To develop a microfluidic chip with regenerable SERS substrates for continuous-flow analysis.
• To overcome limitations of traditional stationary SERS targets in multi-measurement applications.
• To enable interference-free, consecutive SERS measurements within microfluidic channels.

Main Methods:

• Inkjet printing of silver nanoparticles onto integrated, electrically connected SERS targets within a microfluidic chip.
• Utilizing electrically assisted regeneration to restore the SERS substrate's activity.
• Performing consecutive surface-enhanced Raman measurements in a continuous-flow setup.

Main Results:

• Demonstration of a microfluidic chip enabling multiple, sequential SERS measurements.
• Successful electrical regeneration of stationary SERS targets, eliminating memory effects.
• Achieved interference-free SERS measurements in a continuous-flow system.

Conclusions:

• The developed microfluidic chip with regenerable SERS targets provides a robust platform for continuous-flow chemical analysis.
• This approach significantly enhances the usability of stationary SERS substrates by enabling multiple, reliable measurements.
• The technology circumvents common issues, paving the way for advanced microfluidic-based spectroscopic applications.