Graphene Gas Osmometers

Here it is shown that graphene membranes that separate 2 gases at identical pressure are deflected by osmotic pressure. The osmotic pressure is a consequence of differences in gas permeation rates into a graphene enclosed cavity. The deflection of the few layer graphene membranes is detected by an i...

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Bibliographic Details
Published inarXiv.org
Main Authors Dolleman, Robin J, Cartamil-Bueno, Santiago J, Herre S J van der Zant, Steeneken, Peter G
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 17.06.2016
Subjects
Deflection
Gas permeation
Gases
Graphene
Membranes
Osmometers
Osmosis
Penetration
Physics - Mesoscale and Nanoscale Physics
Pressure dependence
Time dependence
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Summary:Here it is shown that graphene membranes that separate 2 gases at identical pressure are deflected by osmotic pressure. The osmotic pressure is a consequence of differences in gas permeation rates into a graphene enclosed cavity. The deflection of the few layer graphene membranes is detected by an interferometric technique for measuring their tension-induced resonance frequency. Using a calibration measurement of the relation between resonance frequency and pressure, the time dependent osmotic pressure on the graphene is extracted. The osmotic pressure for different combinations of gases shows large differences that can be accounted for by a model based on the different gas permeation rates. Thus a graphene membrane based gas osmometer with a responsitivity of ~60 kHz/mbar and nanoscale dimensions is demonstrated.
ISSN:2331-8422
DOI:10.48550/arxiv.1606.05566