Abstract
The Manganese doped zinc sulfide nanoparticles of the cubic zinc blende structure with the average crystallite size of about 3.56 nm were synthesized using a coprecipitation method using Thioglycolic Acid as an external capping agent for surface modification. The ZnS:Mn2+ nanoparticles of diameter 3.56 nm were manufactured through using inexpensive precursors in an efficient and eco-friendly way. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR) spectroscopy are used to examine the structure, morphology and chemical composition of the nanoparticles. The antimicrobial activity of (ZnS:Mn2+) nanocrystals was investigated by measuring the diameter of inhibition zone using well diffusion mechanism versus two various bacterial strains. The technique of microorganism inactivation was considered as sorts-dependent. Bacillus subtilis showed the largest antibacterial sensitivity (35 mm) to ZnS: Mn2+ nanoparticles at a concentration (50 mM) whereas Escherichia coli offered maximum zone of inhibition (20 mm) at the same concentration. In this study, the results indicated that ZnS:Mn2+ nanoparticles were found to have significant antibacterial activity against Gram-negative (E. coli) and Gram-positive (Bacillus subtilis) bacteria.
Highlights
Nanometer sized materials with their unique as well as interesting biophysical and biochemical properties have enticed a major transact of benefit in the scientific society
X-Ray Diffraction (XRD) for Zinc sulfide (ZnS):Mn2+ NPs Figure 1 shows the XRD pattern of the synthesized ZnS:Mn2+ shows that there are no additional peaks of impurity could be discovered where three broad peaks are observed in the diffractrogram at around 28.84 ̊, 48.04 ̊, 56.86 ̊ corresponding to (111), (220) and (311) planes of cubic ZnS respectively
The average crystallite size was calculated using the Debye-Scherrer formula D = Kλ/βcosθ, where D is the crystallite size, K is the geometric factor (0.9), λ is the X-ray wave length (1.54 Å), β is the full width at half maxima (FWHM) of the diffraction peak and θ is the diffraction angle
Summary
Nanometer sized materials with their unique as well as interesting biophysical and biochemical properties have enticed a major transact of benefit in the scientific society. After discovering the Zinc sulfide (ZnS) as one of the initial semiconductors, shows marked substantial properties, versatility and is highly promising for novel different applications due to the existence of a large number of surface atoms and the three dimensional confinement of electrons [5]. Their outstanding potential applications derived from their properties like nonlinear optical with a luminescence that are controlled by quantum size influence as well as other significant physical and chemical properties [6]. It has been previously established that the direct bandgap II-VI semiconductor like ZnS as well as Zinc blende and Wurtzite crystal structure, which their band gap energies at room temperature equal to 3.68 and 3.80 eV respectively [11]
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