In this study, cobalt oxide Nano films were fabricated by pulsed laser deposition method on glass substrates. The structures of the cobalt oxide thin films were investigated FESEM images showed spherical nanoparticles with a diameter of (10-28 nm) and the particles appeared in the case of clustered pushes, and the absorption spectra showed a strong peak in the ultraviolet region at 300 nm. The result of the third-order nonlinear optical properties of cobalt oxide films also showed saturated absorption and nonlinear concentration. Thus, the cobalt oxide Nano films possess good features in nonlinear applications. The electrical features of the cobalt oxide films improved highly. The Nano films also showed NO2 sensing activity (29%, 25%, 24%) at temperatures (200, 250, 300℃) respectively. The result showed that cobalt oxide Nano films can be used in a wide range of applications.
