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  • Title: Determination of the Thermal Noise Limit of Graphene Biotransistors.
    Author: Crosser MS, Brown MA, McEuen PL, Minot ED.
    Journal: Nano Lett; 2015 Aug 12; 15(8):5404-7. PubMed ID: 26176844.
    Abstract:
    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.
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