“…Zinc oxide has a wide band gap large excitation energy of 60 meV, high chemical stability, good piezo-electric properties, nontoxicity and biocompatibility. To synthesize ZnO nanoparticles with transition metals, several different methods have been employed, such as wet chemical methods like sol-gel [32], co-precipitation [33], combustion [34] etc. These nanoparticles have been used in a wide range of applications, such as sensors, varistors, piezoelectric, transducers, surface acoustic wave devices, phosphors, transparent conducting oxides, optoelectronic devices, ferromagnetic devices, and heterogeneous photo catalysts [35][36][37][38][39][40].…”