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Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

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Capacitive Based Micromachined Resonators for Low Level Mass Detection.

Muhammad Umair Nathani1, Haleh Nazemi1, Calvin Love1

  • 1Department of Electrical and Computer Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada.

Micromachines
|December 30, 2020
PubMed
Summary

This study reviews capacitive micromachined resonators for detecting volatile organic compounds. Sensitivity depends on material and clamping, guiding future gas sensor design.

Keywords:
capacitiveclamped membranegas detectiongas sensorgravimetricmicrobridgemicrocantilevermicroelectromechanical systemsmicromachined resonatorsensitivity

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Chemical Sensing

Background:

  • Miniaturized gas sensors are advancing with microfabrication.
  • Micromachined resonators offer high sensitivity for mass loading detection.
  • Capacitive micromachined resonators are explored for electronic nose applications.

Purpose of the Study:

  • Investigate mass sensing characteristics of capacitive micromachined resonators.
  • Review microcantilever, microbridge, and clamped membrane designs.
  • Identify critical design parameters and achievable mass sensitivity.

Main Methods:

  • Detailed investigative review of three geometric designs.
  • Finite element analysis for mass sensitivity modeling (picogram range).
  • Comparative analysis of sensor sensitivities, advantages, and disadvantages.

Main Results:

  • Capacitive micromachined sensor sensitivity depends on material composition and clamping.
  • Each geometric design shows unique potential for volatile organic compound detection.
  • Finite element analysis modeled picogram-level mass variations.

Conclusions:

  • Provides groundwork for selecting optimal capacitive micromachined resonator geometry.
  • Highlights advantages over other mass sensor types.
  • Informs future research in miniaturized, high-sensitivity gas sensing arrays.