Microring electrode/optical waveguide: electrochemical characterization and application to electrogenerated...

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Optoelectronics

Background:

• Traditional analytical methods often require bulky instrumentation.
• Integrating optical and electrochemical detection in a single microprobe offers enhanced analytical capabilities.
• Miniaturization of analytical devices is crucial for in-situ and point-of-care applications.

Purpose of the Study:

• To develop a novel optoelectrochemical microprobe by integrating optical fibers and electrochemical sensing.
• To characterize the electrochemical behavior of the developed microring electrode.
• To demonstrate the utility of the microprobe for sensitive electrogenerated chemiluminescence (ECL) detection.

Main Methods:

• Fabrication of a gold-coated optical fiber with a polished flat surface forming a microring electrode.
• Electrochemical characterization using cyclic voltammetry and chronoamperometry.
• Electrogenerated chemiluminescence measurements using tris(2,2'-bipyridine)ruthenium(II) and persulfate in a mixed solvent system.

Main Results:

• The microring electrode's electrochemistry showed limiting currents consistent with theoretical models.
• The probe successfully performed electrogenerated chemiluminescence with Ru(bpy)3(2+).
• A low detection limit of 4.3 x 10(-8) M for Ru(bpy)3(2+) was achieved.

Conclusions:

• A versatile optoelectrochemical microprobe has been successfully developed.
• The probe integrates optical and electrochemical functionalities in a miniaturized format.
• The device shows promise for sensitive analytical detection in various applications.