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Nanostructured ZnO films for anti-adhesion activity against S.aureus

S.R.Geetha, P.Deepak Raj, P.Dhivya, S.Adline Princy, M.Sridharan

Emergence of bacterial adhesion causes severe infections in implants which lead to device failure. Adhesion of bacteria can be diminished by adapting the surface of the material. ZnO films were grown by reactive dc magnetron sputtering onto thoroughly cleaned stainless steel and glass substrates with diverging the cathode power from 20 to 40 W. The sputtered films were characterized using X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM) and UV-Visible Spectroscopy to study the structural, morphological and optical properties. XRD results proved that the sputtered films were crystalline in nature with preferred (002) orientation and the crystallite size were increased. FE-SEM shows the films formed with spherical morphology. Upon increasing the sputtering power the transparency of the films increased from 75 to 99 % and the thickness of the films was increased from 171 to 187 nm. The ZnO films deposited at 30 W cathode power exhibited better anti adhesion activity against Staphylococcus aureus (S.aureus)