On-Chip Cyclic Voltammetry Measurements Using a Compact 1024-Electrode CMOS IC
| Autor: | Carlos I. Dorta-Quinones, Meng Huang, Manfred Lindau, Bradley A. Minch |
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| Rok vydání: | 2021 |
| Předmět: |
Working electrode
business.industry Chemistry Dopamine 010401 analytical chemistry Transistor Oxides Integrated circuit Electrochemical Techniques 010402 general chemistry 01 natural sciences Amperometry 0104 chemical sciences Analytical Chemistry law.invention Microelectrode CMOS Semiconductors law Electrode Optoelectronics Cyclic voltammetry business Microelectrodes |
| Zdroj: | Analytical chemistry. 93(22) |
| ISSN: | 1520-6882 |
| Popis: | Complementary metal-oxide-semiconductor (CMOS) microelectrode arrays integrate amplifier arrays with on-chip electrodes, offering high-throughput platforms for electrochemical sensing with high spatial and temporal resolution. Such devices have been developed for highly parallel constant voltage amperometric detection of transmitter release from multiple cells with single-vesicle resolution. Cyclic voltammetry (CV) is an electrochemical method that applies voltage waveforms, which provides additional information about electrode properties and about the nature of analytes. A 16-channel, 64-electrode-per-channel CMOS integrated circuit (IC) fabricated in a 0.5 μm CMOS process for CV is demonstrated. Each detector consists of only 11 transistors and an integration capacitor with a unit dimension of 0.0015 mm2. The device was postfabricated using Pt as the working electrode material with a shifted electrode design, which makes it possible to redefine the size and the location of working electrodes. The system incorporating cell-sized (8 μm radius) microelectrodes was validated with dopamine injection tests and CV measurements of potassium ferricyanide at a 1 V/s scanning rate. The cyclic voltammograms were in excellent agreement with theoretical predictions. The technology enables rigorous characterization of electrode performance for the application of CMOS microelectrode arrays in low-noise amperometric measurements of quantal transmitter release as well as other biosensing applications. |
| Databáze: | OpenAIRE |
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