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Gas Chromatography: Overview of Detectors01:13

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Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
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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...
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Manufacturing of a Nafion-coated, Reduced Graphene Oxide/Polyaniline Chemiresistive Sensor to Monitor pH in Real-time During Microbial Fermentation
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Analytical Approach to Study Sensing Properties of Graphene Based Gas Sensor.

Ali Hosseingholipourasl1, Sharifah Hafizah Syed Ariffin1, Yasser D Al-Otaibi2

  • 1UTM-MIMOS Center of Excellence in Telecommunication Technology, School of Electrical Engineering, Universiti Teknologi Malaysia, Skudai 81310, Johor, Malaysia.

Sensors (Basel, Switzerland)
|March 19, 2020
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Summary

Graphene

Keywords:
I-V characteristicsadsorptionanalytical modelinggas sensorgraphene

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Graphene is a highly regarded carbon-based material for sensor applications due to its exceptional electrical and physical properties.
  • Its properties change significantly upon exposure to various gas molecules, making it suitable as a transducer in gas sensors.

Purpose of the Study:

  • To develop analytical models for investigating graphene's electronic properties after molecular adsorption.
  • To analyze changes in energy band structure, density of states (DOS), carrier velocity, and I-V characteristics.

Main Methods:

  • Development of new analytical models to simulate graphene's response to gas adsorption.
  • Investigation of the effects of carbon monoxide (CO), nitrogen dioxide (NO2), and water (H2O) adsorption.

Main Results:

  • Gas adsorption was found to modulate graphene's energy band structure and energy bandgap.
  • This modulation led to changes in the density of states (DOS), converting graphene to a semiconducting material.
  • Graphene's conductivity, carrier velocity, and I-V characteristics were significantly affected.

Conclusions:

  • The study demonstrates that gas adsorption alters key electronic properties of graphene.
  • These modulated properties, including DOS and I-V characteristics, can be utilized as sensing parameters for developing novel graphene-based gas sensors.