Abstract

The HAp/TiO2 Composite thin films were prepared by sol-gel dip-coating technique using precursor solutions of calcium acetate and titanium (IV) isopropoxide (TTIP) employing a dipping rate of 20 seconds with different number of dipp 4, 6 and 8 respectively. The XRD analysis of HAp/TiO2 composite has confirmed crystalline quality and the crystallite size was estimated to range from 97 nm to 116 nm. The SEM analysis reveals the formation of uniform coating with cubic structure. The presence of Ti, O, Ca and P was detected by Energy dispersive X-ray analysis. The stretching and vibrational properties of composites were reported using FTIR analysis. The surface topography, band gap analysis using AFM and UV-Vis absorption spectroscopy are also presented. The calculated energy gap values of HAp/TiO2 composite thin films for various dipping rates are 3.854 eV,4.000 eV and 4.066 eV respectively. It has been shown that, the composite coatings depend on the number of dipping and the compositions of HAp and TiO2. The antimicrobial activities of the HAp/TiO2 composite thin films were investigated against Bacillus (MTCC6428) and E. coli (MTCC 739) by agar diffusion assay and REMA. These results showed that HAp/TiO2 composite films have good bacterial adsorption and also exhibited good inhibition on positive and negative bacteria.