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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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...
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

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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Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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Published on: November 15, 2016

Tellurium nano-structure based NO gas sensor.

Vivek Kumar1, Shashwati Sen, M Sharma

  • 1Department of Physics, Barkatullah University, Bhopal 462026, M.R, India.

Journal of Nanoscience and Nanotechnology
|November 26, 2009
PubMed
Summary

Tellurium nanotubes grown on silver nanoparticles show enhanced NO gas sensitivity. This improvement is attributed to increased oxygen adsorption and conductivity, paving the way for better gas sensors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Nanostructured tellurium (Te) materials offer unique electronic and sensing properties.
  • Metallic nanoparticles serve as effective nucleation centers for controlled nanomaterial growth.
  • Gas sensors are crucial for environmental monitoring and industrial safety.

Purpose of the Study:

  • To synthesize tellurium nanotubes using metallic nanoparticle templates.
  • To investigate the gas sensing properties of these tellurium nanotubes, particularly for NO.
  • To elucidate the gas sensing mechanism of tellurium nanotubes.

Main Methods:

  • Vacuum deposition technique for tellurium nanotube growth on silicon substrates with silver/gold nanoparticles.
  • Gas sensitivity testing of tellurium nanostructures with various gases (NO, H2S, NH3).
  • Characterization using Raman spectroscopy and X-ray photoelectron spectroscopy (XPS).

Main Results:

  • Tellurium nanotubes were successfully grown on silver (Ag) and gold (Au) nanoparticle-templated silicon substrates.
  • Nanotube density increased while diameter decreased with metallic nanoparticle templating.
  • Tellurium nanotubes on Ag templates exhibited superior response and selectivity to NO gas compared to H2S and NH3.
  • Gas sensing mechanism involves increased oxygen adsorption, leading to higher hole density and conductivity upon NO interaction.

Conclusions:

  • Metallic nanoparticles effectively template the growth of tellurium nanotubes with controlled morphology.
  • Tellurium nanotubes demonstrate enhanced gas sensitivity and selectivity for NO detection.
  • The findings suggest potential for developing advanced gas sensors based on templated tellurium nanostructures.