Issue 14, 2019

Origin of the anomalous size-dependent increase of capacitance in boron nitride–graphene nanocapacitors

Abstract

The anomalous size-dependent increase in capacitance in boron nitride–graphene nanocapacitors is a puzzle that has been initially attributed to the negative quantum capacitance exhibited by this particular materials system. However, we show in this work that the anomalous nanocapacitance of this system is not due to quantum effects but has pure electrostatic origin and can be explained by a parallel-plate (square) nanocapacitor model filled with a dielectric film characterized by a size/thickness-dependent relative permittivity. The model presented here is in excellent agreement with the experimentally measured capacitance values of recently fabricated graphene and hexagonal boron nitride nanocapacitors. The results obtained seem to suggest that the size-dependent increase of capacitance in the above-mentioned family of nanocapacitors can be explained by classical finite-size geometric electrostatic effects.

Graphical abstract: Origin of the anomalous size-dependent increase of capacitance in boron nitride–graphene nanocapacitors

Article information

Article type
Paper
Submitted
24 Janv. 2019
Accepted
22 Febr. 2019
First published
11 Marts 2019
This article is Open Access
Creative Commons BY license

RSC Adv., 2019,9, 7849-7853

Origin of the anomalous size-dependent increase of capacitance in boron nitride–graphene nanocapacitors

O. Ciftja, RSC Adv., 2019, 9, 7849 DOI: 10.1039/C9RA00614A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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