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Identifier

000465802

Title

Pulsed laser processing of graphene-based materials

Alternative Title

Κατεργασία υλικών με βάση το γραφένιο με χρήση παλμικών λέιζερ

Author

Μιχαήλ, Αντρέας Μ.

Thesis advisor

Στρατάκης, Εμμανουήλ

Reviewer

Κιοσέογλου, Γεώργιος
Ηλιόπουλος, Ελευθέριος

Abstract

In recent years, graphene, due to its exceptional properties, has attracted attention in the research field. Graphene and its derivatives have been extensively used in applications such as energy, sensors, etc. The main objective of this thesis was to investigate the optimal conditions for the reduction of graphene oxide using laser irradiation. The motivation behind this study was the future utilization of reduced graphene oxide in energy-related applications, such as photovoltaic systems and hydrogen production through electrocatalysis. Initially, a brief description of graphene and its exceptional properties is given. Its structure and preparation methods are described, as well as the reduction of graphene oxide used in this work. Next, graphene oxide is similarly described, along with its reduction methods. At the end of the first section, the basic principles of the characterization methods used in the experimental process are briefly described. The second section is dedicated to describing the experimental process for the production and study of the final reduced graphene oxide films. Initially, the preparation process of both the initial graphene oxide solution and its deposition on the substrate is recorded. Then, the reduction process is described, using pulsed infrared lasers with three different pulse durations. The study is conducted on films with thicknesses of two hundred and one hundred nanometers. Next, the characterization methods are presented. Finally, a very interesting application for electrocatalytic hydrogen production, using the produced films, is briefly described. The final results are summarized in the last section, where the optimal reduction conditions for the different pulse durations and the two discussed thicknesses are presented. The results were captured through various spectroscopy measurements, electrical measurements, and microscopy images. Finally, results from the electrocatalytic hydrogen production are presented.

Language

English

Subject

Graphene oxide

Graphene oxide reduction

Infrared laser

Pulse duration

Αναγωγή οξειδίου του γραφενίου

Διάρκεια παλμού

Οξείδιο του γραφενίου

Υπέρυθρο λέιζερ

Issue date