Figure 3

The Raman spectra data. (a,c,e,g) Raman scattering of Iron powder (IP), Black iron oxide (BI), Red iron oxide (RI) and Yellow iron oxide (YI), respectively. (b,d,f,h), Raman scattering of Iron powder@Graphene (IPG), Black iron oxide@Graphene (BIG), Red iron oxide@Graphene (RIG) and Yellow iron oxide@Graphene (YIG) nanocomposites, respectively. (pure autoclaved graphene at 5000 rpm has been used for preparing of all nanocomposits).