“…The synthesis routes includes hydrothermal, [8][9][10] solgel, [11][12][13][14][15][16][17][18][19][20] high temperature ring, 21 ame pyrolysis 22 and electrospinning. 23,24 The different types of microstructures includes hollow spheres, 8 thin lms, 12,16,17,19,20 porous lms, 13,18 nanoparticles, 9,15,22,25 nanobers, 23,24 nanotubes 10 and powders.…”