Synthesis and Characterization of Mn3O4-Graphene Nanocomposite thin Film by an ex situ Approach

摘要

In this study, we report a new approach for Mn3O4-graphene nanocomposite by ex situ method. This nanocomposite shows two-dimensional aggregation of nanoparticle, and doping effect by decorated manganese oxide (Mn3O4), as well. The graphene film was made through micromechanical cleavage of graphite on the SiOVSi wafer. Manganese oxide (Mn3O4) nanoparticle with uniform cubic shape and size (about 5.47 ± 0.61 nm sized) was synthesized through the thermal decomposition of manganese(II) acetate, in the presence of oleic acid and oleylamine. The nanocomposite was obtained by self-assembly of nanoparticles on graphene film, using hydrophobic interaction. After heat treatment, the decorated nanoparticles have island structure, with one-layer thickness by two-dimensional aggregations of particles, to minimize the surface potential of each particle. The doping effect of Mn3O4 nanoparticle was investigated with Raman spectra. Given the upshift in positions of G and 2D in raman peaks, we suggest that Mn3O4 nanoparticles induce p-doping of graphene film.