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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,...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

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Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
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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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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Published on: August 30, 2012

Sol-gel-based, planar waveguide sensor for gaseous iodine.

L Yang1, S S Saavedra, N R Armstrong

  • 1Department of Chemistry, University of Arizona, Tucson, Arizona 85721.

Analytical Chemistry
|May 31, 2011
PubMed
Summary
This summary is machine-generated.

A new optical sensor detects gaseous iodine using sol-gel processed glass films. This highly selective and stable sensor offers rapid response for environmental monitoring.

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Optical Technologies

Background:

  • Gaseous iodine detection is crucial for environmental and industrial safety.
  • Existing iodine sensors often lack selectivity, speed, or long-term stability.
  • Integrated optical waveguide sensors offer potential for sensitive and miniaturized detection.

Purpose of the Study:

  • To develop a novel sensor for sensitive and selective gaseous iodine detection.
  • To utilize sol-gel processing and planar integrated optical waveguides for sensor fabrication.
  • To characterize the sensor's performance, including response range, speed, selectivity, and stability.

Main Methods:

  • Sol-gel processing of siloxane precursors to create a porous, methylated glass film.
  • Incorporation of phenyl groups into the glass matrix for iodine interaction.
  • Fabrication of the sensor by coating the glass film onto a single-mode planar optical waveguide.
  • Monitoring iodine detection via attenuated total reflection of guided light, triggered by charge transfer complex formation.
  • Utilizing integral grating couplers for light coupling into and out of the waveguide structure.

Main Results:

  • The sensor demonstrated a linear response to gaseous iodine (I(2)) from 100 parts per billion (ppb) to 15 parts per million (ppm).
  • Rapid response and recovery times, both less than 15 seconds, were observed.
  • The sensor showed high selectivity, responding to 4 ppm iodine in the presence of 10 ppm chlorine.
  • The developed sensor maintained stability for at least 3 months.

Conclusions:

  • A novel, highly sensitive, and selective optical sensor for gaseous iodine has been successfully developed.
  • The combination of sol-gel processing and integrated optics provides an effective platform for chemical sensing.
  • The sensor's rapid response, stability, and selectivity make it suitable for various environmental and industrial monitoring applications.