Iodine doped zinc oxide (I-ZnO) thin films were synthesized by microwave assisted successive ionic layer adsorption (mSILAR) method. The structural characteristics of pure ZnO and I-ZnO thin films were carried out by powder X-ray diffraction (PXRD) analysis. The potential toxicity of pure and I-ZnO films was examined against gram-positive species like Staphylococcus aureus, Streptococcus haemolyticus and Bacillus cereus as well as gram-negative species like Escherichia coli, Klebsiella pneumonia, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella typhi, Serratia marcescens, Proteus rettigiri and Vibrio cholera by employing disc diffusion method. All the samples exhibited antibacterial activity on the tested organisms. I-ZnO produced maximum activity against both gram-positive and gram-negative species compared with pure ZnO thin film. The gram-positive species were observed to be more resistant to pure and I-ZnO thin films than gram-negative species. The studies revealed an enhancement in antibacterial activity of the I-doped thin films as compared to pure ZnO thin films.
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