期刊
NANO LETTERS
卷 15, 期 8, 页码 5404-5407出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01788
关键词
Graphene field-effect transistor; noise; biosensor; 1/f noise; liquid gate
类别
资金
- National Science Foundation [DBI-1450967]
- Div Of Biological Infrastructure
- Direct For Biological Sciences [1450853, 1450967] Funding Source: National Science Foundation
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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