Double doping (Mn + Cl) effects on the structural, morphological, photoluminescence, optoelectronic properties and antibacterial activity of CdO thin films

The effects of (Mn + Cl) double doping on some physical properties and antibacterial activity of CdO thin films deposited by spray technique using a perfume atomizer is reported in this paper. XRD studies confirm the polycrystalline nature of the films. CdO:Mn and (Mn + Cl) doubly doped CdO thin films exhibit face-centered cubic structure similar to that of the undoped CdO film. Decreased transparency is observed for the Mn-doped CdO film which got enhanced for the (Mn + Cl) doubly doped films. Optical band gap exhibits a red shift for the CdO:Mn thin film and with (Mn + Cl) double doping it exhibits a blue shift which may be attributed to Moss-Burstein (MB) effect. Increased resistivity is observed for the Mn-doped CdO film and for the (Mn + Cl) doubly doped films it decreases. From the obtained results it is observed that CdO thin films doubly doped with Mn and Cl precursor ions exhibit better physical properties which make them suitable for future optoelectronic device applications. Antibacterial activities of the as deposited films were carried out against E. coli a gram negative bacteria and from the zone of inhibition it is confirmed that the (Mn + Cl) doubly doped CdO thin films can be used as a good antimicrobial agent against pathogenic microorganisms.