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Imaging neuronal seal resistance on silicon chip using fluorescent voltage-sensitive dye
1Department of Membrane and Neurophysics, Max Planck Institute for Biochemistry, Martinsried/Munich, Germany.
Biophysical Journal
|August 10, 2004
Summary
Measuring the electrical resistance between cells and electronic chips is key for bioelectronic devices. This study introduces a novel optical method to quantify this interface resistance, aiding device optimization.
Area of Science:
- Bioelectronics
- Cellular Electrophysiology
- Materials Science
Background:
- Electrical sheet resistance at the cell-chip interface is critical for bioelectronic device performance.
- This parameter dictates the efficiency of electrical signal transmission between biological cells and electronic components.
Purpose of the Study:
- To develop and validate a novel optical method for measuring electrical sheet resistance at the cell-chip interface.
- To determine the specific resistance of the intercellular cleft for various cell types.
Main Methods:
- Applied AC voltage to oxidized silicon chips with attached cells.
- Imaged voltage changes across cell membranes using fluorescent voltage-sensitive dyes.
- Fitted voltage maps with a planar core-coat conductor model to extract sheet resistance.
Main Results:
- Nerve cells, HEK293, and MDCK cells exhibited a sheet resistance of 10 MΩ, yielding a specific resistance of 50 Ωcm.
- Erythrocytes showed significantly higher sheet resistance (~1.5 GΩ), resulting in an enhanced specific resistance of 1500 Ωcm in the narrow cleft.
- The optical method proved convenient for characterizing cell-chip interfaces.
Conclusions:
- The developed optical method provides a facile approach to quantify cell-chip interface resistance.
- Specific resistance values vary significantly between cell types, impacting bioelectronic device design.
- This technique is valuable for optimizing cell-chip interfaces in bioelectronic applications.