“…In a similar way to the ZnO semiconductors, many different forms of CdO have been created at the nanoscale, such as cubes [64], thin films of nanoclusters [65], wires [66,67], nanoclusters [68], nanoparticles [69][70][71], crystals [72,73], nanorodes [74] and several more exotic structures such as CdO Rhombus-like nanostructure [75] and heterojunction nanofibres [76], among others [77]. The range of processing techniques applicable to CdO semiconductors mirrors those of ZnO, for example sonochemical and solvothermal processes [78], thermal decomposition [79], soft chemical methods [80], and evaporation techniques [81]. Zn x Cd 1 À x O composite material has been produced using several methods, with the assistance of both spontaneous and piezoelectric polarisations of the internal electric field [82,83].…”