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Synthesis, optical and magnetic properties of graphene quantum dots and iron oxide nanocomposites

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Document pages: 8 pages

Abstract: The combination of graphene quantum dots (GQD) and magnetic nanoparticles provides a unique set of optical and magnetic for future energy and medical applications. We report the method and engineering of synthesizing GQD and iron oxide (Fe3O4) nanocomposites (NCS) by pulsed laser discharge. High resolution transmission electron microscopy (HRTEM) images show that GQD with purity of 2 – 10 has higher yield   nano diameter. The hexagonal structure and lattice stripes related to C – C bonds in GQD are clearly visible. The UV induced structural and optical changes of gqds and gqds-fe3o4 NC samples were studied by absorption and emission spectra in the range of deep UV-vis spectra. The photoluminescence spectrum shows that the subband π→ 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.

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