Two- to one-dimensional crossover in graphene quantum dot arrays observed in reduced graphene oxide nanoribbons

Daeha Joung and Saiful I. Khondaker

Phys. Rev. B 89, 245411 – Published 9 June 2014

Abstract

We investigate how the electron transport properties of graphene quantum dot (GQD) arrays transition from two dimensions (2D) to one dimension (1D) in lithographically defined reduced graphene oxide nanoribbons (RGONRs). From the low-temperature electron transport measurements of 200-, 100-, and 50-nm-wide RGONRs, we find that the energy barrier for charge transport increases with decreasing RGONR width in both the Coulomb blockade and the variable-range hopping regime. Different charge transport parameters for 200-nm RGONR are in agreement with 2D transport while these parameters show a gradual transition to 1D transport in 50-nm RGONR.

Received 31 December 2013
Revised 6 May 2014

DOI:https://doi.org/10.1103/PhysRevB.89.245411

Authors & Affiliations

Daeha Joung^1,2 and Saiful I. Khondaker^1,2,3,*

¹Nanoscience Technology Center, University of Central Florida, Orlando, Florida 32826, USA
²Department of Physics, University of Central Florida, Orlando, Florida 32826, USA
³School of Electrical Engineering and Computer Science, University of Central Florida, Orlando, Florida 32826, USA

^*To whom correspondence should be addressed: saiful@ucf.edu

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Vol. 89, Iss. 24 — 15 June 2014

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