Graphene Gas Sensor

Master thesis (2018)

Authors

I.E. Rosłoń Applied Sciences

Contributors

R.J. Dolleman (mentor)
F. Alijani (mentor)
Herre S.J. van der Zant (graduation committee member)
Faculty
Applied Sciences, Applied Sciences
Copyright: © 2018 Irek Rosłoń
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Published Date

24-07-2018

Language

English

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Faculty

Applied Sciences

Abstract

Gas permeation through graphene membranes has received considerable attention for water purification and molecular sieving applications. However, characterization of the permeation has been limited to long timescales of minutes. This thesis shows a method for measuring gas permeation through porous graphene membranes at the microsecond timescale. Suspended porous graphene membranes, with an average pore size of 14 nm and a single 400 nm pore, are brought into sinusoidal motion by optothermal actuation. By monitoring the frequency dependent phase delay between actuation signal and mechanical motion, the gas dependent permeation time of the porous membrane is determined. The permeation time constant is demonstrated to be proportional to the square root of the molecular mass, indicating an effusion dominated permeation mechanism. The determination of permeation at timescales below 1 ms using a femtoliter gas cavity opens up opportunities for novel nanoscale porous graphene based gas sensors, with very fast response times.

Files

Thesis_IER_Final.pdf
(pdf | 32 Mb)
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