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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

43
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
43
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

2.1K
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
2.1K
Amperometry: Overview01:10

Amperometry: Overview

2.0K
Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
2.0K
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

1.0K
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
1.0K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

2.4K
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
2.4K
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

803
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
803

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Related Experiment Video

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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
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CMOS Electrochemical Instrumentation for Biosensor Microsystems: A Review.

Haitao Li1, Xiaowen Liu2, Lin Li3

  • 1Maxim Integrated Products Inc., 160 Rio Robles, San Jose, CA 95134, USA. haitaoli7036@gmail.com.

Sensors (Basel, Switzerland)
|January 3, 2017
PubMed
Summary

This review analyzes complementary metal oxide semiconductor (CMOS) circuits for electrochemical biosensors, highlighting their advantages over optical methods for miniaturized, cost-effective healthcare diagnostics.

Keywords:
amperometrybiosensorcurrent readoutelectrochemicalimpedance spectroscopypotentiostat

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Sensor Technology

Background:

  • Electrochemical biosensors offer advantages in speed, cost, and miniaturization over optical methods.
  • Traditional electrochemical instruments face limitations in portability and integration.
  • Complementary metal oxide semiconductor (CMOS) technology presents a viable solution for advanced biosensor instrumentation.

Purpose of the Study:

  • To review and analyze CMOS instrumentation circuits for electrochemical biosensors.
  • To provide insights into design options and performance trade-offs for CMOS electrochemical circuits.
  • To discuss future trends in on-CMOS sensor integration for miniaturized biosensor microsystems.

Main Methods:

  • Presentation of fundamental electrochemical sensing concepts from an instrumentation perspective.
  • Categorization and review of existing CMOS electrochemical instrumentation circuits.
  • Analysis of design choices and performance characteristics of reported CMOS circuits.

Main Results:

  • CMOS circuits offer superior performance, cost-effectiveness, and miniaturization potential for electrochemical biosensors.
  • A functional classification of CMOS electrochemical instrumentation circuits is presented.
  • Design options and performance trade-offs are illuminated through circuit analysis.

Conclusions:

  • CMOS instrumentation circuits are crucial for advancing electrochemical biosensor technology.
  • On-CMOS sensor integration is a key trend for developing highly miniaturized electrochemical biosensor microsystems.
  • This review guides the design of next-generation electrochemical sensors.