Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 52, Issue -, Pages 106-111Publisher
ELSEVIER
DOI: 10.1016/j.physe.2013.03.028
Keywords
Graphene functionalization; Hydrofluoric acid; Transport properties; Current modulation; Quantum dots
Funding
- Russian Foundation for Basic Research [12-02-01275, 11-02-00722]
- Ministry of Education and Science of the Russian Federation [8028]
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In the present study, conditions suitable for efficient modification of graphene and few-layer graphene (FLG) films with aqueous solutions of hydrofluoric acid (HF) and for local protection of the graphene against such modification in isopropyl alcohol were identified. A combination of the two treatments gives one a key to nanodesign of graphene-based 2D devices. It was found that a few-minute treatment of graphene or FLG in HF aqueous solutions (similar to 1 min for graphene and similar to 5 min for FLG films about 5 nm thick) leads to strong changes in the structural and electrical properties of graphene involving a step-like increase in resistivity (up to 10(11) Omega/square). Two types of materials were obtained after different times of treatment: (i) promising for electronic applications of the material due to a combination of high carrier mobility, high conductivity, and strong current modulation by gate voltage (up to four orders of magnitude); (ii) a material with insulating properties and graphene quantum dots embedded in an insulating matrix. (C) 2013 Elsevier B.V. All rights reserved.
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