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Int. J. Mol. Sci. 2018, 19(9), 2639;

Noise Analysis of Monolayer Graphene Nanopores

College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
Materials Characterization and Preparation Center, Southern University of Science and Technology, Shenzhen 518055, China
Authors to whom correspondence should be addressed.
Received: 5 July 2018 / Revised: 21 August 2018 / Accepted: 3 September 2018 / Published: 6 September 2018
(This article belongs to the Special Issue Nucleic Acid Nanotechnology)
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Graphene-based nanopore devices have shown tantalizing potential in single molecule detection for their monoatomic membrane thickness which is roughly equal to the gap between nucleobases. However, high noise level hampers applications of graphene nanopore sensors, especially at low frequencies. In this article, we report on a study of the contribution of suspended graphene area to noise level in full frequency band. Monolayer graphene films are transferred onto SiNx substrates preset with holes in varied diameters and formed self-supported films. After that, the films are perforated with smaller, nanoscale holes. Experimental studies indicate a dependency of low-frequency 1/f noise on the underlying SiNx geometry. The contribution of the suspended graphene area to capacitance which affects the noise level in the high frequency range reveals that the graphene free-standing film area influences noise level over a wide frequency region. In addition, the low-frequency noise demonstrates a weak dependency on salt concentration, in deviation from Hooge’s relation. These findings and attendant analysis provide a systematic understanding of the noise characteristics and can serve as a guide to designing free-standing monolayer graphene nanopore devices. View Full-Text
Keywords: monolayer graphene; solid-state nanopore; suspended area; noise; power spectral density monolayer graphene; solid-state nanopore; suspended area; noise; power spectral density

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Zhang, Z.-Y.; Deng, Y.-S.; Tian, H.-B.; Yan, H.; Cui, H.-L.; Wang, D.-Q. Noise Analysis of Monolayer Graphene Nanopores. Int. J. Mol. Sci. 2018, 19, 2639.

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