A Facile Route to Coat Iron Oxide Nanoparticles with Few-Layer Graphene

Abstract

The use of few-layer graphene coatings over nanoparticles is attractive, as it offers both long-term stability to the nanoparticles and renders them biocompatible due to the inert nature of the coating material. Moreover, graphitic coatings provide an easy platform for additional functionalization, making graphitic coated nanoparticles attractive candidates for multimodal therapeutics. Alternative strategies to coat nanoparticles often result in inhomogeneous coatings and unwanted contaminants that are hard to remove. In this work, we show the feasibility to use oleic acid as a precursor for the formation of multilayer graphene over iron oxide nanoparticles using a facile and clean route. The demonstrated graphitization process was driven by electron beam irradiation or thermal annealing. Thermal annealing leads to reduction of the iron oxide to pure iron and provides a means to tailor the magnetic properties of the multilayer graphene coated nanoparticles which are attractive as units for hyperthermia therapeutics. The graphitization process is also demonstrated over Si/SiO 2 wafers.

Synthesis of Graphene Oxide-Fe3O4 Based Nanocomposites Using the Mechanochemical Method and in Vitro Magnetic Hyperthermia

“…Graphene oxide-Fe 3 O 4 nanoparticle-based nanocomposites are widely investigated for various biomedical applications, like drug delivery, magnetic hyperthermia, and MRI (Magnetic Resonance Imaging) contrast agents [1,2,3,4,5]. Unique chemical and physical properties of graphene oxide-based nanocomposites enables us to design and engineer their structure as per requirements [6].…”

Solvothermal‐Induced Self‐Assembly of Fe2O3/GS Aerogels for High Li‐Storage and Excellent Stability

“…Graphene sheets (GS), with large specific surface area, high electrical conductivity, and extraordinary mechanical properties, can serve as an intriguing substrate to anchor electrochemically active materials and accommodate their volume change during cycling . Hence, various graphene‐based hybrids have been developed with improved lithium storage . However, most of the previous works focused on the preparation of two‐dimensional (2D) graphene‐based composites, in which nanoparticles anchored on the surface of GS.…”

A Brief Review of the Synthesis and Catalytic Applications of Graphene‐Coated Oxides

“…Besides using GO precursor, the graphene coating layer on metal oxides can be also generated starting from other carbon sources. For example, Mendes et al . used oleic acid as a carbon source to form a few layer graphene coating on iron oxide nanoparticles (NPs).…”