Nanomechanical Molecular Mass Sensing Using Suspended Microchannel Resonators

In this work we study the different phenomena taking place when a hydrostatic pressure is applied in the inner fluid of a suspended microchannel resonator. Additionally to pressure-induced stiffness terms, we have theoretically predicted and experimentally demonstrated that the pressure also induces...

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Bibliographic Details
Published inSensors (Basel, Switzerland) Vol. 21; no. 10; p. 3337
Main Authors Martín-Pérez, Alberto, Ramos, Daniel, Tamayo, Javier, Calleja, Montserrat
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 11.05.2021
MDPI
Subjects
Aqueous solutions
Atmospheric pressure
Atomic properties
Communication
Compressibility
Frequency response
Gas mixtures
gas sensing
Gases
Hydrostatic pressure
interferometry
microcapillary
Microchannels
microfluidics
Nitrogen
optomechanics
Pollutants
Pressure effects
Resonators
Sensors
Simulation
Stiffness
transparent resonators
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Summary:In this work we study the different phenomena taking place when a hydrostatic pressure is applied in the inner fluid of a suspended microchannel resonator. Additionally to pressure-induced stiffness terms, we have theoretically predicted and experimentally demonstrated that the pressure also induces mass effects which depend on both the applied pressure and the fluid properties. We have used these phenomena to characterize the frequency response of the device as a function of the fluid compressibility and molecular masses of different fluids ranging from liquids to gases. The proposed device in this work can measure the mass density of an unknown liquid sample with a resolution of 0.7 µg/mL and perform gas mixtures characterization by measuring its average molecular mass with a resolution of 0.01 atomic mass units.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s21103337