Graphene Gas Osmometers

Abstract

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.

References in corpus (2)

• Graphene Squeeze-Film Pressure Sensors
• Visualizing the motion of graphene nanodrums

Cited by in corpus (11)

• Highly sensitive electromechanical piezoresistive pressure sensors based on large-area layered PtSe${}_2$ films
• Nanoelectromechanical Sensors based on Suspended 2D Materials
• Young's modulus of 2D materials extracted from their nonlinear dynamic response
• High-frequency stochastic switching of graphene resonators near room temperature
• Graphene multi-mode parametric oscillators
• Optomechanics for thermal characterization of suspended graphene
• High-yield large-scale suspended graphene membranes over closed cavities for sensor applications
• Amplitude calibration of 2D mechanical resonators by nonlinear optical transduction
• Squeeze-film effect on atomically thin resonators in the high-pressure limit
• Mass measurement of graphene using quartz crystal microbalances
• Enhancing the sensitivity and selectivity of pyrene-based sensors for detection of small gaseous molecules via destructive quantum interference