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Towards Portable MEMS Oscillators for Sensing Nanoparticles.

Malar Chellasivalingam1,2, Arthur T Zielinski3,4, Thomas S Whitney1

  • 1Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK.

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Summary
This summary is machine-generated.

This study demonstrates portable microelectromechanical systems (MEMS) resonators for nanoparticle detection. The system successfully quantified silver nanoparticles and indoor airborne particles by measuring mass accumulation on the MEMS oscillator.

Keywords:
MEMSindoor particlesnanoparticlesoscillatorsparticulate matterresonant frequencyresonatorssensorssilver nanoparticles

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Area of Science:

  • Nanotechnology
  • Sensor Technology
  • Materials Science

Background:

  • Microelectromechanical systems (MEMS) offer miniaturized sensing solutions.
  • Piezoelectric-on-silicon resonators provide high sensitivity for mass detection.
  • Portable experimental setups are crucial for in-situ environmental monitoring.

Purpose of the Study:

  • To design and implement a portable MEMS resonator system for nanoparticle sensing.
  • To evaluate the system's capability in detecting size-selected silver nanoparticles and ambient indoor particles.
  • To assess the challenges and performance of MEMS resonators in a practical laboratory setting.

Main Methods:

  • Utilized piezoelectric-on-silicon MEMS oscillators with a center frequency around 5.999 MHz.
  • Employed an inertial impaction technique for depositing nanoparticles onto the MEMS resonator surface.
  • Developed a portable experimental setup for nanoparticle generation, deposition, and sensing within a laboratory environment.

Main Results:

  • Successfully detected and quantified 50 nm silver nanoparticles, measuring deposited mass at approximately 7.993 nanograms.
  • Quantified indoor particle mass accumulation at approximately 1.732 nanograms and 26.9 picograms across two experimental runs.
  • Achieved a frequency resolution of approximately 32 parts per billion (ppb), enabling a minimum detectable particle mass of around 60 femtograms with a 9.2-second integration time.

Conclusions:

  • The portable MEMS resonator system is effective for sensing and quantifying nanoparticles in a laboratory environment.
  • The study highlights challenges in particle deposition within portable setups but confirms MEMS resonator viability.
  • Demonstrated high sensitivity and resolution for nanoparticle mass detection, paving the way for advanced environmental monitoring applications.