ZnO is an attractive material for short-wavelength optoelectronic applications owing to its wide band gap 3.37 eV, large bond strength, and large exciton binding energy (60 meV) at room temperature and the missing absorbance of visible light makes this material one of the best transition metal oxide nanoparicles so far. By using ZnO nanoparticles, it is possible to tune the optical and electrical properties in a wide range. As a wide band gap material, ZnO is used in solid state blue to ultraviolet (UV) opto-electronics, including laser developments . In addition, due to its non-centrosymmetric crystallographic phase, ZnO shows the piezoelectric property, which is highly useful for the fabrication of devices such as electromagnetic coupled sensors and actuators .