Synthesis and characterization of graphene

Dissertant

al-Husayn, Adi Abd M.

Thesis advisor

Ali, Salam Husayn
Wahhab, Hilal S.

University

University of Technology

Faculty

-

Department

Applied Sciences Department

University Country

Iraq

Degree

Ph.D.

Degree Date

2013

English Abstract

Graphene, a single atomic layer of hexagonally arranged sp2-hybridized carbon atoms, with a thickness of only 0.34 nm, exhibits unique properties.

The current interest in graphene can be attributed to three main reasons.

Firstly, various forms of graphite, nanotubes, buckyballs and others can all be viewed as derivatives of graphene.

Secondly, the scalability of graphene devices to nanodimensions makes it a promising candidate for applications in nano-devices.

Thirdly, its electron transport properties are described by the Dirac equation which allows access to quantum electrodynamics in a simple condensed matter experiment.

Among the different methods to produce graphene sheets by exfoliation of graphite, the electrochemical route has been very scarcely investigated.

The electrochemical exfoliation of graphite represents a simple one-step method to produce graphene sheets in ionic liquid/water mixtures where hydroxyl and oxygen radicals produced by anodic oxidation of water start the oxidation of the edge planes of graphite, facilitating intercalation of an ions from the ionic liquid.

The resulting graphene samples were characterized by, light optical microscopy, TEM, XRD, Raman spectroscopy, Ultraviolet and visible absorption spectroscopy.

The XRD pattern of graphene film contains a sharp and intensive peak at 29 = 26.1782°.

The basal spacing of the graphite was increased from 3.35A to 4.301 A in the reduction of graphene oxide.

This result indicates that the direct reaction of graphite particles with aqueous solution can be proposed as another route for the exfoliated graphite having excellent physical properties.

Raman spectroscopy is employed to study various samples.

Our calculations show that the, the lateral sizes La = 6.324nm, The intensity ratio /G//2D of the product is ~1.59 and I(D)/I(G) ratio ~0.6957.

As in the absorption spectrum has been calculated energy gap delegation was identical to our theoretical in Annex.

Main Subjects

Chemistry

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-412911