Abstract
Sr-doped ZnO nanoparticles have been synthesized using a soft chemical method. The doping ratio of Sr is varied in the range of 0 at.%, 3 at.%, and 5 at.% to 7 at.%. X-ray diffractograms revealed that the samples had hexagonal (wurtzite) structure without a trace of any mixed phase. The average crystallite size of the nanoparticles (NPs) ranged from 39 to 46 nm. The average crystallite size was increased for the initial doping (3 at.%) of Sr ions, and further increase in the doping ratio reduced the particle size due to some distortion produced in the lattice. The surface morphology of the samples and structure of the NPs were investigated using FESEM (Field Emission Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy) pictures, respectively. EDX (energy-dispersive X-ray) spectroscopy confirmed the presence of strontium (Sr) in the host lattice. Photoluminescence and X-ray diffraction confirmed that the dopant ions replace some of the lattice zinc ions and that Sr2+ and Sr3+ ions coexist in the ZnO lattice. The Sr-doped ZnO exhibited violet and blue luminescence spectra at 408 nm and 492 nm, respectively. ZnO : Sr nanoparticles showed increased antibacterial activity against one gram-positive as well as one gram-negative bacteria.
Highlights
Zinc oxide (ZnO) is a II-VI semiconductor with a wide band gap (3.37 eV) that has a lot of uses in optoelectronics [1,2,3]
The XRD of Sr-doped ZnO nanoparticles with different strontium atomic ratios is shown in Figure 1 (0, 3, 5, and 7 at.%)
The impacts of Sr on ZnO nanoparticles were investigated in terms of structural, morphological, and optical properties
Summary
Zinc oxide (ZnO) is a II-VI semiconductor with a wide band gap (3.37 eV) that has a lot of uses in optoelectronics [1,2,3]. The electrical and optical capabilities of variously shaped ZnO nanowires and nanoparticles have been utilized for a variety of intriguing applications, including light-emitting diodes, phosphors, solar cells, nanolasers, electrical generators, and biosensors [1, 9,10,11,12,13,14]. Nanoparticles and nanowires of various shapes are frequently synthesized, and their optical and electrical properties have been demonstrated for a wide range of applications, including [9,10,11,12,13,14]. The photoluminescence and antibacterial efficiency of ZnO can be improved by doping with transition metals, rare earth elements, alkaline elements, and noble metals. Doping alkaline earth metals with ZnO causes lattice defects due to charge
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