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Related Concept Videos

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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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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Attogram mass sensing based on silicon microbeam resonators.

In-Bok Baek1,2, Sangwon Byun2,3, Bong Kuk Lee2

  • 1Department of Physics, Research Institute for Natural Sciences, Hanyang University, 222 Wangsimri-ro, Seongdonggu, Seoul, 04763, Korea.

Scientific Reports
|April 22, 2017
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Summary
This summary is machine-generated.

Researchers achieved sub-attogram per Hertz mass sensitivity using silicon microbeam resonators, a breakthrough for micro-electromechanical systems (MEMS) mass sensors. Fabrication improvements enhanced resonator performance and revealed unique buckling behaviors under mass loading.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Micro-electro-mechanical systems (MEMS) offer miniaturized solutions for sensing applications.
  • High-sensitivity mass sensors are crucial for detecting minute mass changes.

Purpose of the Study:

  • To demonstrate sub-attogram per Hertz (ag/Hz) mass sensitivity using doubly-clamped silicon microbeam resonators.
  • To investigate and characterize buckling phenomena in MEMS resonators.
  • To introduce fabrication techniques for enhancing mass sensitivity and resonator performance.

Main Methods:

  • Utilized doubly-clamped silicon microbeam resonators with silicon nitride anchors.
  • Implemented two fabrication techniques: sacrificial SiN layer deposition and optimized anchor structure design.
  • Performed mass loading using Au/Ti thin films on localized microbeam areas.
  • Analyzed the effects of mass loading on resonator dimensions, position, and film distribution.

Main Results:

  • Achieved sub-attogram per Hertz (ag/Hz) mass sensitivity, a notable advancement for MEMS mass sensors.
  • Observed and characterized both local micro-buckling and global buckling phenomena induced by excessive mass loading.
  • Demonstrated that anchor support increases the critical buckling length.

Conclusions:

  • The developed silicon microbeam resonators exhibit ultra-high mass sensitivity.
  • Fabrication improvements significantly enhance MEMS mass sensor performance.
  • Understanding buckling phenomena is critical for designing robust and sensitive micro-scale resonators.