▎ 摘　　要

Quantum capacitance of hybrid graphene copper nanoribbon (HGCN) has been calculated using first principle density functional theory (DFT). Compared to an infinite sheet of graphene on copper substrate, a HGCN width below 3 nm shows significant enhancement of quantum capacitance suggesting a possible application for energy storage devices. On the other hand, electronic chip interconnect application is limited above this critical 3 nm width because of a large total capacitance. It has been observed that enhancement of quantum capacitance occurs due to the weakening of electron-electron interaction and Fermi velocity modulation. In this work, the origin of such quantum capacitance enhancement has been studied for HGCN using ab-initio DFT calculation with possible effect at nanoribbon width higher than 3 nm. Moreover, an approximate semi-empirical analytic equation based model has been proposed describing the quantum capacitance enhancement of such quasi-one dimensional graphene-copper hybrid structure. (c) The Author(s) 2017. Published by ECS. All rights reserved.