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MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

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Related Experiment Video

Updated: May 13, 2026

Dynamic Multiparameter Platelet Function Assessment Using a Capacitive Biosensor

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Published on: May 2, 2025

A CMOS magnetic microbead-based capacitive biosensor array with on-chip electromagnetic manipulation.

An-Yu Chang¹, Michael S-C Lu

¹Institute of Electronics Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC.

Biosensors & Bioelectronics

|March 5, 2013

Summary

This summary is machine-generated.

This study presents an integrated lab-on-chip platform using electromagnetic microcoils and capacitive biosensors on a complementary metal oxide semiconductor (CMOS) chip for microbead manipulation and detection without external equipment. Single microbead detection was successfully demonstrated, reducing system size and cost.

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Area of Science:

Biotechnology
Biomedical Engineering
Microfluidics

Background:

Magnetic microbeads are crucial for cell and biomolecule manipulation and detection in biotech and biomedical research.
Current lab-on-chip systems often require external instruments, increasing complexity and cost.
An integrated solution for both manipulation and detection is needed to advance miniaturized diagnostic platforms.

Purpose of the Study:

To develop an integrated lab-on-chip platform for simultaneous manipulation and detection of magnetic microbeads.
To implement electromagnetic microcoils and capacitive biosensors on a complementary metal oxide semiconductor (CMOS) chip.
To demonstrate a cost-effective and compact system that eliminates the need for external magnetic field generators.

Main Methods:

Fabrication of an integrated platform combining electromagnetic microcoils and capacitive biosensors on a CMOS chip.
Utilizing functionalized anti-streptavidin antibody-coated sensors to capture streptavidin-coated magnetic microbeads.
Employing a capacitance-to-frequency readout for sensitive detection of single microbeads without external magnetic fields.

Main Results:

Successful manipulation and precise detection of single streptavidin-coated magnetic microbeads.
Demonstrated a significant average capacitance change of -5.3 fF for the experimental group compared to -0.2 fF for the control group.
Validated a CMOS-integrated system for microbead sensing that requires no external magnetic fields.

Conclusions:

The developed integrated platform offers a novel, compact, and cost-effective solution for magnetic microbead manipulation and detection.
The CMOS-based capacitive biosensor approach provides a sensitive and simplified detection method.
This technology has potential applications in miniaturized biomedical diagnostics and high-throughput screening assays.