Robust Functionalization of Large Microelectrode Arrays by Using Pulsed Potentiostatic Deposition

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Surface modification is crucial for microsensor and microsensor array development.
• Existing methods may lack uniformity, flexibility, or precise control over deposited coatings.

Purpose of the Study:

• To present a novel electrodeposition scheme using voltage pulses for microelectrode surface modification.
• To demonstrate the uniformity, flexibility, and precise control offered by this pulsed deposition method.

Main Methods:

• Utilized a pulsed potentiostatic deposition scheme.
• Employed a fully integrated complementary metal-oxide-semiconductor (CMOS) chip with a 1024-microelectrode array.
• Deposited and characterized platinum, gold, poly(ethylenedioxythiophene) (PEDOT), and poly(phenylenediamine) (PPD).

Main Results:

• Achieved uniform electrode coatings with precise control over surface texture.
• Demonstrated successful deposition of four distinct materials (Pt, Au, PEDOT, PPD).
• Showcased the method's applicability to individual electrodes and large arrays (up to thousands).

Conclusions:

• The pulsed voltage electrodeposition method is robust, reproducible, and versatile for microelectrode functionalization.
• This technique is highly suitable for developing advanced microsensors and integrated microelectrode arrays.
• The method allows for tailored surface properties critical for diverse sensor applications.