Abstract
Nano-structured Co3O4 thin film are synthesized by dip coating and their structural, surface, optical and magnetic properties have been studied. The X-ray diffraction of film shows that the crystalline Co3O4 has cubic structure with preferrd orientation along the (400) plane which makes them advantageous for optoelectronic devices. The scanning electron microscopy micrograph reveals that the film has a porous structure. The transmission of the films gradually decreases with the decrease of the wavelength in the 900–300 nm region. Upon enhancing the withdrawal speed of the substrate, the transmission shows decrement due to increase in film thickness. From the investigation of the transmission spectra of Co3O4 films, the band-gap is found to lie between 2.12 and 2.30 eV. Magnetic characteristic of thin films relies on the withdrawal speed and thickness of thin films. With the increase of withdrawal speed saturation magnetization increases while coercivity of thin films decreases.
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