J. BARMAN^*#, B. BANIK**, FARHANA SULTANA^***

^*Department of Physics, ADP College, Nagaon, 782002, India

^**Department of Herbal Science and Technology, ADP College, Nagaon, 782002, India

^***Biotech Hub, ADP College, Nagaon, Assam, India

Semiconductor material to biological system has a significant advance in recent research. The composite ZnS/CdS material with Fe doping has been grown by chemical route and there structural and composition has been analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The surface was analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) method. The engineered band gap was calculated by absorption spectroscopy and found that absorption was blue-shifted. Photoluminescence analysis shows that luminescence of Fe²⁺ ions affected by the host crystal and symmetry leads to the emission color from green to orange/red. The band gap of the composite material depends on various parameter like doping concentration and composite material. From the established model the particles size was estimated and size becomes comparable with TEM and XRD. XRD patterns refined by the Rietveld method shows that the composite is hexagonal wurtzite structure. The structural analysis showed that doping concentration changes the size and transition level and create better efficiency in antimicrobial activity. The antibacterial observation showed that the 2.0 wt% Fe-doped with composite 2:3 ratio exhibited maximum antibacterial effect.

Key words: Composite, antimicrobial, XRD.

Corresponding author’s e-mail: jayantabarman2006@gmail.com