Raman Spectroscopic Detection in Continuous Microflow Using a Chip-Integrated Silver Electrode as an Electrically...

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Spectroscopy

Background:

• Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique.
• Detecting analytes in continuous microflow presents challenges, particularly with irreversible adsorption.
• Existing methods lack efficient analyte stripping for real-time monitoring.

Purpose of the Study:

• To develop an electrochemical approach for SERS detection in continuous microflow.
• To enable quasi-real-time SERS analysis by overcoming analyte adsorption issues.
• To integrate SERS detection with microfluidic devices for enhanced analytical capabilities.

Main Methods:

• Integration of a silver electrode as a SERS substrate within a microfluidic chip.
• Application of actuation voltage pulses (approx. 4 V) to the silver electrode.
• Utilizing electrochemical stripping to remove irreversibly adsorbed analytes.

Main Results:

• Demonstrated successful SERS detection in a continuous microflow system.
• Showcased the ability to strip irreversibly adsorbed analytes using electrochemical pulses.
• Achieved quasi-real-time SERS monitoring of compounds.

Conclusions:

• The electrochemical approach enables efficient SERS detection in microfluidic devices.
• This method facilitates in situ SERS monitoring of compounds in continuous flow.
• The technique has significant potential for microseparation techniques and lab-on-a-chip applications.