Determination of the Thermal Noise Limit of Graphene Biotransistors

To determine the thermal noise limit of graphene biotransistors, we have measured the complex impedance between the basal plane of single-layer graphene and an aqueous electrolyte. The impedance is dominated by an imaginary component but has a finite real component. Invoking the fluctuation–dissipat...

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Bibliographic Details
Published in:Nano letters 2015-08, Vol.15 (8), p.5404-5407
Main Authors: Crosser, Michael S, Brown, Morgan A, McEuen, Paul L, Minot, Ethan D
Format: Article
Language:English
Subjects:
Biosensing Techniques
Density
Devices
Electric Impedance
Electrolytes - chemistry
Equipment Design
Fluctuation
Graphene
Graphite - chemistry
Impedance
Nanostructure
Noise
Temperature
Thermal noise
Transistors, Electronic
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Summary:To determine the thermal noise limit of graphene biotransistors, we have measured the complex impedance between the basal plane of single-layer graphene and an aqueous electrolyte. The impedance is dominated by an imaginary component but has a finite real component. Invoking the fluctuation–dissipation theorem, we determine the power spectral density of thermally driven voltage fluctuations at the graphene/electrolyte interface. The fluctuations have 1/f p dependence, with p = 0.75–0.85, and the magnitude of fluctuations scales inversely with area. Our results explain noise spectra previously measured in liquid-gated suspended graphene devices and provide realistic targets for future device performance.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.5b01788