Real-time particle mass spectrometry based on resonant micro strings

Sensors (Basel). 2010;10(9):8092-100. doi: 10.3390/s100908092. Epub 2010 Aug 27.

Abstract

Micro- and nanomechanical resonators are widely being used as mass sensors due to their unprecedented mass sensitivity. We present a simple closed-form expression which allows a fast and quantitative calculation of the position and mass of individual particles placed on a micro or nano string by measuring the resonant frequency shifts of the first two bending modes. The method has been tested by detecting the mass spectrum of micro particles placed on a micro string. This method enables real-time mass spectrometry necessary for applications such as personal monitoring devices for the assessment of the exposure dose of airborne nanoparticles.

Keywords: MEMS; NEMS; aerosol; mass spectrometry; micro beads; nanoparticles; particle sensor; string resonator.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Mass Spectrometry / instrumentation*
  • Mass Spectrometry / methods*
  • Microtechnology / instrumentation*
  • Microtechnology / methods*
  • Models, Theoretical
  • Nanoparticles / analysis
  • Particulate Matter / analysis

Substances

  • Particulate Matter