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Related Concept Videos

Field Effect Transistor01:29

Field Effect Transistor

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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
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The test of the kinetic molecular theory (KMT) and its postulates is its ability to explain and describe the behavior of a gas. The various gas laws (Boyle’s, Charles’s, Gay-Lussac’s, Avogadro’s, and Dalton’s laws) can be derived from the assumptions of the KMT, which have led chemists to believe that the assumptions of the theory accurately represent the properties of gas molecules.
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Concentration Cells

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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
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Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection.

Xinyuan Zhou1,2, Liping Yang3, Yuzhi Bian4,5

  • 1State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. zhouxinyuan14@mails.ucas.edu.cn.

Sensors (Basel, Switzerland)
|March 7, 2018
PubMed
Summary

A new p+n field effect transistor (FET) circuit amplifies methane gas detection signals ~15 times. This enhanced methane sensor achieves a lower limit of detection (LOD) of ~10 ppm, crucial for preventing explosions.

Keywords:
amplification effectfield effect transistorslow concentration methane gasmetal oxide gas sensors

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Area of Science:

  • Electrical Engineering
  • Chemical Sensing
  • Materials Science

Background:

  • Accurate detection of low-concentration combustible methane gas is critical for safety.
  • Existing methane sensors may have limitations in sensitivity and limit of detection (LOD).

Purpose of the Study:

  • To design and evaluate a coupling p+n field effect transistor (FET) amplification circuit for enhanced methane gas detection.
  • To improve the sensitivity and lower the LOD of commercial methane sensors.

Main Methods:

  • Designed a coupling p+n FET amplification circuit.
  • Optimized load resistance (R) for the circuit.
  • Tested the performance of the modified sensor with methane gas.

Main Results:

  • The coupling circuit magnified the methane sensor's response by approximately 15 times.
  • The limit of detection (LOD) was reduced from several hundred ppm to approximately 10 ppm.
  • Achieved an apparent response of 7.0 ± 0.2 and a voltage signal of 1.1 ± 0.1 V.

Conclusions:

  • The developed p+n FET coupling circuit significantly enhances methane gas detection capabilities.
  • The improved sensitivity and lower LOD are promising for detecting trace methane concentrations.
  • This technology can contribute to preventing accidental explosions by providing earlier warnings.