1Adel H. OmranAlkhayatt, 1,2Mohammad Rassol Ahmed
1University of Kufa, Faculty of Science
2University of IbnHayyan , Faculty of Medicine
Abstract. Cadmium Sulfide (CdS) nanoparticles were synthesized hydrothermally at various
reaction temperatures (140, ,160, 180,200) ° C. Crystal structure and surface morphology were
studied corresponding to the reaction temperature. The X,-ray diffraction results, reveals that
CdS nanoparticles were prepared have high crystallinity with polycrystalline nature and
hexagonal wurtzite phase. The preferential orientation was along (002) and (110) planes. The
average crystallite size was tended to increase with the increase of reaction temperature which
about (21-24) nm. The structure parameters such as dislocation density and microstrain was
examined. CdS nanoparticle images in Field Emission Scanning Electron Microscopy
(FESEM) indicates rounded ball (cauliflower), the particle size was in the range of (23-245)
nm and the smallest size was obtained for the nanoparticles at reaction temperature 200 °C.
The antibacterial activity of cadmium sulfide CdS nanoparticles was estimated against two
types of common bacteria (Gram-negative Escherichia coli and Gram-positive Staphylococcus
aureus). It was found that there is a strong antibacterial activity and the greatest effect was for
the prepared nanoparticles at reaction temperatures 160 and 180 oC, and the highest activity
was found against (E. coli) bacteria as well as with the increase of nanoparticles concentration.
This work combines microbiology and nanotechnology, perform probable advances in the
formulation of a new kind of antibacterial.
Keywords: CdS nanoparticles; Hydrothermal method; structure properties; Antibacterial
activity; Escherichia coli; Staphylococcus aureus.