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Sensors 2010, 10(9), 8092-8100; doi:10.3390/s100908092
Communication

Real-Time Particle Mass Spectrometry Based on Resonant Micro Strings

* ,
 and
Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Building 345 East, DK-2800 Kongens Lyngby, Denmark
* Author to whom correspondence should be addressed.
Received: 10 July 2010 / Revised: 30 July 2010 / Accepted: 15 August 2010 / Published: 27 August 2010
(This article belongs to the Section Physical Sensors)
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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 ofthe 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 theexposure dose of airborne nanoparticles.
Keywords: mass spectrometry; MEMS; NEMS; nanoparticles; string resonator; micro beads; aerosol; particle sensor mass spectrometry; MEMS; NEMS; nanoparticles; string resonator; micro beads; aerosol; particle sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Schmid, S.; Dohn, S.; Boisen, A. Real-Time Particle Mass Spectrometry Based on Resonant Micro Strings. Sensors 2010, 10, 8092-8100.

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