Platinum electrode modification: Unique surface carbonization approach to improve performance and sensitivity.

Area of Science:

• Electrochemistry
• Materials Science
• Biomedical Engineering
• Microfluidics

Background:

• Microfluidic devices often utilize electrochemical detection with microelectrodes.
• Electrode miniaturization typically reduces sensitivity and signal-to-noise ratio (S/N).
• Surface modification of microelectrodes is a key strategy to enhance performance.

Purpose of the Study:

• To improve the performance and sensitivity of platinum electrodes in microfluidic devices.
• To investigate the use of carbon derived from red blood cells for electrode surface modification.
• To measure DC electrical resistances of red blood cell suspensions for hematocrit determination.

Main Methods:

• Coating platinum electrodes with carbon derived from red blood cells.
• Measuring current responses of red blood cell suspensions in a microchannel.
• Surface analysis using field emission scanning electron microscopy (FESEM), energy dispersive spectrometry (EDS), and Raman spectrometry.

Main Results:

• Platinum electrode performance, including reproducibility and S/N, improved over time during measurements.
• Electrocatalytic activity for red blood cell current measurements increased by 140%.
• Red blood cells adsorbed and carbonized platinum electrode surfaces, forming proteomic carbon layers with increased surface area and a porous 3D structure.

Conclusions:

• Coating platinum electrodes with red blood cell-derived carbon significantly enhances their performance and sensitivity.
• The carbon layer improves signal-to-noise ratio and stabilizes current measurements.
• This method offers a promising approach for improving electrochemical detection in microfluidic applications, including hematocrit determination.