Additionally, the high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) elemental mapping of the LSCO particles indicates the spatial arrangement for La, Sr, Co and O. Figure shows that the HAADF image of the LSCO nanoparticles, and the corresponding elemental mapping of La (Figure ), Sr (Figure ) and Co (Figure ) corroborates the existence of Sr in the crystal structure.