Table of Contents Author Guidelines Submit a Manuscript
Advances in Materials Science and Engineering
Volume 2018, Article ID 3254081, 8 pages
Research Article

Synthesis, Optical, and Magnetic Properties of Graphene Quantum Dots and Iron Oxide Nanocomposites

1Western Kentucky University, Bowling Green, KY 42101, USA
2Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, PR, USA
3Department of Physics, University of Puerto Rico, Rio Piedras Campus, San Juan, PR 00925, USA
4School of EECS, Ohio University, Athens, OH 45701, USA
5Department of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan, PR 00925, USA

Correspondence should be addressed to M. Sajjad; ude.ukw@dajjas.dammahum

Received 16 October 2017; Revised 18 February 2018; Accepted 13 March 2018; Published 12 April 2018

Academic Editor: Raphael Schneider

Copyright © 2018 M. Sajjad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The combination of nanomaterial graphene quantum dots (GQDs) with magnetic nanoparticles offers a unique set of optical and magnetic properties for future energy and medical applications. We report on the synthesis and engineering of GQDs and iron oxide (Fe3O4) nanocomposites (NCs) by using a pulsed laser discharge technique. High-resolution transmission electron microscopy (HRTEM) images showed a high yield of pure GQDs with 2–10 nm diameter. The hexagonal structures and lattice fringes associated with the C–C bond in GQDs were clearly identifiable. The structural and optical changes in GQDs and GQDs-Fe3O4 NC samples induced by UV light were investigated by the absorption and emission spectroscopy over the deep UV–visible spectral range. The photoluminescence spectra have shown subband ππ transitions in GQDs-Fe3O4 NC. Magnetic properties of the GQDs-Fe3O4 NC samples have shown room temperature ferromagnetism induced by pure Fe3O4 nanoparticles and from the substantial spin polarized edges of GQD nanoparticles. It is concluded that the observed optical and magnetic properties could be further tailored in the studied nanocomposites for prospective medical applications.