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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

840
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
840
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

1.1K
There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
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Resistivity01:22

Resistivity

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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
4.2K

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Related Experiment Video

Updated: Nov 23, 2025

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
08:18

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Published on: June 12, 2016

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A chemiresistive methane sensor.

Máté J Bezdek1, Shao-Xiong Lennon Luo1, Kang Hee Ku1

  • 1Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|January 1, 2021
PubMed
Summary
This summary is machine-generated.

A new chemiresistive sensor detects methane (CH4) at room temperature. This low-power, low-cost sensor offers environmental benefits for gas leak detection in homes and industries.

Keywords:
catalysischemiresistorsmethaneselectorssensor

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Environmental Monitoring

Background:

  • Methane (CH4) is a potent greenhouse gas and explosion hazard.
  • Accurate and accessible methane detection is crucial for safety and environmental monitoring.
  • Existing sensors may have limitations in power consumption, cost, or operating conditions.

Purpose of the Study:

  • To develop a novel chemiresistive sensor for sensitive and selective methane detection.
  • To enable low-power, room-temperature sensing of methane in ambient air.
  • To explore the potential for distributed and cost-effective methane monitoring.

Main Methods:

  • Fabrication of chemiresistors using single-walled carbon nanotubes (SWCNTs) functionalized with poly(4-vinylpyridine) (P4VP).
  • Incorporation of a platinum-polyoxometalate (Pt-POM) precatalyst via P4VP coordination.
  • Characterization of the SWCNT-P4VP-Pt-POM composite's response to methane and other gases.

Main Results:

  • The composite sensor demonstrated ppm-level sensitivity to methane.
  • The sensor exhibited good stability in air and over time.
  • A high-valent platinum intermediate mechanism was proposed for the chemiresistive response.
  • Selective detection of methane over heavier hydrocarbons and other gases was achieved.

Conclusions:

  • The developed SWCNT-P4VP-Pt-POM chemiresistor is a promising technology for low-power, room-temperature methane sensing.
  • The sensor's selectivity and sensitivity support its application in environmental monitoring and gas leak detection.
  • The use of a simple handheld multimeter demonstrates the practical utility of this sensor.