In , an approach to an "amorphous carbon coating on the surface" of iron oxide particles, "via a simple glucose treatment" is given. The researchers obtained "novel configurations of iron oxides [which] possess an amorphous carbon layer and ferrous state with high electronic conductivity, which definitely enhances their electrochemical properties compared to pristine iron oxides". In the Figure by Song et al., we can find "the Raman spectra of iron oxide and carbonencapsulated Fe3O4 nanocrystals. Iron oxide can normally be categorized as a material for which special care has to be taken during the measurement of Raman spectra because the transition metal (iron) inside its structure is divalent (ferrous or ferric)". Song and coworkers tell that the Raman spectrum of the pristine iron oxide that they have characterized possesses three broad bands at 390, 590 and 710 cm -1 and two bands around 1360 and 1580 cm -1 attributed to a typical hematite" (Song et al., mentioning Shebanova and Lazor). Song et al. do not provide information about the used Raman equipment and laser power.