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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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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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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...
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Fast and Accurate Exhaled Breath Ammonia Measurement
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Room Temperature Ammonia Gas Sensing Using Mixed Conductor based TEMPOS Structures.

Mamta Saroch1, Sunita Srivastava2, Dietmar Fink3

  • 1Department of Physics, Panjab University, 160014 Chandigarh, India. mamtasaroch@yahoo.co.in.

Sensors (Basel, Switzerland)
|November 23, 2016
PubMed
Summary
This summary is machine-generated.

Novel TEMPOS (Tunable Electronic Material with Pores in Oxide on Silicon) devices exhibit diode-like behavior and sensitive ammonia detection. Impedance measurements reveal enhanced sensitivity due to charge carriers and high surface area, crucial for sensor development.

Keywords:
Etched ion tracksTEMPOS structuresammonia sensorsimpedance measurements

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics Engineering

Background:

  • Mixed ion-electron conductors offer unique electronic properties.
  • MOS-like structures with nanopores present opportunities for novel device applications.
  • Ammonia sensing requires sensitive and selective detection methods.

Purpose of the Study:

  • To characterize the current/voltage behavior of TEMPOS structures.
  • To investigate the ammonia sensing capabilities of TEMPOS devices using impedance spectroscopy.
  • To explore the influence of material composition and structure on sensor performance.

Main Methods:

  • Fabrication of TEMPOS structures with ion-conductive and mixed-conductive materials in nanopores.
  • Measurement of current/voltage characteristics to understand device behavior.
  • Impedance spectroscopy to analyze frequency and signal magnitude dependence for ammonia sensing.

Main Results:

  • TEMPOS structures demonstrate diode-like current/voltage characteristics.
  • Impedance measurements show a clear dependence on ammonia concentration, frequency, and applied signal magnitude.
  • Enhanced sensitivity attributed to increased charge carriers (protons) and high surface-to-volume ratio.

Conclusions:

  • TEMPOS structures are promising for electronic applications and ammonia sensing.
  • The combination of mixed conductivity and nanoporous architecture enhances sensor sensitivity.
  • Measuring both real and imaginary impedance parts significantly improves ammonia detection.