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Determination of the Thermal Noise Limit of Graphene Biotransistors

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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[superscript 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.
  • Keywords: Noise, Liquid gate, Graphene field-effect transistor, 1/f noise, Biosensor
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  • Crosser, M. S., Brown, M. A., McEuen, P. L., & Minot, E. D. (2015). Determination of the thermal noise limit of graphene biotransistors. Nano Letters, 15(8), 5404-5407. doi:10.1021/acs.nanolett.5b01788
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  • 15
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  • 8
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  • Funding for this research was provided by the National Science Foundation under award number DBI-1450967.
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