Modification of standard CMOS technology for cell-based biosensors

Area of Science:

• Biotechnology
• Materials Science
• Electrical Engineering

Background:

• Standard biosensors often require specialized, costly fabrication processes.
• Integrating signal processing with electrodes can be complex and expensive.

Purpose of the Study:

• To develop a fully biocompatible and chemically inert electrode using a simple, low-cost complementary metal oxide semiconductor (CMOS) process.
• To demonstrate the electrode's capability for detecting both fast neuronal electrical activity and slow cellular impedance changes.
• To reduce the complexity and cost of external systems for biosensing applications.

Main Methods:

• Utilized standard CMOS technology for electrode fabrication.
• Modified unprocessed CMOS aluminum electrodes using bench-top anodization and plating techniques, avoiding clean-room requirements.
• Integrated circuit design for amplifiers, filters, and wireless subsystems.

Main Results:

• Achieved fully biocompatible and chemically inert electrodes through a simple, low-cost process.
• Demonstrated the ability of the transducers to detect fast neuronal electrical activity.
• Successfully detected slow impedance changes in growing and dividing cells.
• Reduced the need for specialized semiconductor processing equipment and clean-room environments.

Conclusions:

• The developed CMOS-based electrode technology offers a versatile, cost-effective solution for biosensing.
• This approach is suitable for high-throughput drug discovery, neuroprosthetics, and fundamental bioscience research.
• The technology is applicable to various biosensors requiring noble metal or nanoporous microelectrodes.