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Circular shaped microelectrodes for single cell electrical measurements for lab-on-a-chip applications
Amina Farooq1,2, Nauman Zafar Butt2, Umer Hassan3,4
1Department of Electrical and Computer Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, USA.
Biomedical Microdevices
|July 3, 2021
Summary
This study enhances microfluidic impedimetric sensing by optimizing circular electrode design. Novel electrode geometries significantly improve signal-to-noise ratio for detecting microparticles, enabling more sensitive biosensing applications.
Area of Science:
- Electrical Engineering
- Biomedical Engineering
- Nanotechnology
Background:
- Impedimetric sensing offers high sensitivity for single cell characterization but faces challenges with feeble signal detection in microfluidic systems.
- Reduced signal-to-noise ratio (SNR) in microfluidic impedimetric sensors limits accuracy and hinders point-of-care applications.
- Adapting sensing methods to diverse biological measurements and conditions often compromises sensor performance.
Purpose of the Study:
- To enhance sensitivity in microfluidic impedimetric sensing for micron and submicron-sized particles.
- To investigate the impact of novel circular electrode designs on signal detection.
- To improve signal-to-noise ratio (SNR) for more accurate biosensing.
Main Methods:
- A simulation study was conducted using COMSOL Multiphysics.
- Spherical particles ranging from 0.75 µm to 5 µm in diameter were analyzed.
- The influence of radial electrode parameters and electrode gap on differential electrical signals was systematically evaluated.
Main Results:
- Optimizing circular microelectrode geometry and electrode gap significantly impacts signal strength and SNR.
- A >50 dB improvement in SNR was achieved through the optimization of circular electrode geometrical parameters.
- The study demonstrated the strong influence of electrode design on device sensitivity for bioparticle detection.
Conclusions:
- Novel circular electrode designs can substantially enhance sensitivity in microfluidic impedimetric sensing.
- Optimized electrode geometry and gap are critical for improving SNR and enabling accurate detection of microparticles.
- The proposed sensing modality shows potential for nanoparticle detection with further microfluidic device parameter optimization.
