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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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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

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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).
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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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IR Frequency Region: Fingerprint Region01:03

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

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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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Multiresonant Nondispersive Infrared Gas Sensing: Breaking the Selectivity and Sensitivity Trade-Off.

Emma R Bartelsen1,2, J Ryan Nolen3, Christopher R Gubbin3

  • 1Interdisciplinary Materials Science Program, Vanderbilt University, Nashville 37240, Tennessee, United States.

ACS Photonics
|April 6, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel filterless nondispersive infrared (NDIR) gas sensor. The new sensor uses a multipeak thermal emitter to simultaneously detect multiple gas absorption bands, improving sensitivity and selectivity for atmospheric monitoring.

Keywords:
Tamm plasmon polaritonsaperiodic distributed Bragg reflectors (a-DBRs)filterless infrared sensinggas sensingmultiresonant thermal emitters

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Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Materials Science

Background:

  • Nondispersive infrared (NDIR) sensors are crucial for atmospheric monitoring.
  • Traditional NDIR sensors use bandpass filters, limiting sensitivity and selectivity.
  • Filter fabrication is costly and restricted to single frequencies.

Purpose of the Study:

  • To validate a filterless NDIR gas sensing approach.
  • To overcome the sensitivity-selectivity trade-off in NDIR sensors.
  • To demonstrate a multipeak thermal emitter for enhanced gas detection.

Main Methods:

  • Developed a multipeak thermal emitter using inverse design.
  • Created a sensor targeting propane (C3H8) C-H vibrational modes.
  • Designed single-peak emitters for carbon monoxide (CO) and carbon dioxide (CO2) using aperiodic distributed Bragg reflectors (a-DBRs).

Main Results:

  • The filterless approach successfully targeted multiple absorption bands, enhancing sensitivity.
  • Single-peak emitters achieved high quality factors (Q-factors > 50) with minimal crosstalk.
  • Demonstrated accurate detection of CO and CO2 without spectral interference.

Conclusions:

  • The developed filterless NDIR sensor breaks the traditional sensitivity-selectivity trade-off.
  • Aperiodic distributed Bragg reflectors enable efficient, high-Q factor emitters.
  • This technology offers improved performance for atmospheric gas sensing applications.