The XRD patterns were collected using Rigaku D/Max-3C diffractometer with Cu Ka radiation. The SEM images
were obtained using aCarl Zeiss Auriga and the TEM images were taken from JEOL JEM-3010. The sample solutions were dried on carbon-rein forced 300 mesh copper grids prior tothe TEM analysis. The FT-IR spectra were obtained using aThermo ScientificNicolet 6700 spectrometer.