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In the present work,flower-like℃uO nanostructures were synthesized by reflux condensation method without using any surfactants or templates.Structural analysis by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR) and Raman studies revealed the formation of highly crystalline single phase℃uO,exhibiting monoclinic structure.Morphological analysis by field emission scanning electron microscopy(FESEM) showed flower-shaped℃uO hierarchical architecture made up of interpenetrating self-assembled nanosheets.Optical analysis by UVeVis diffused reflectance spectra(DRS) exhibited considerable blue-shift in the optical band gap due to quantum confinement effect.Photoluminescence(PL) spectrum showed both UV as well as visible emissions.The antibacterial activity of flower-shaped℃uO nanostructures were tested against gram-positive(Bacillus subtilis,Bacillus thuringiensis) and gram-negative(Salmonella paratyphi,Salmonella paratyphi-a,Salmonella paratyphi-b,Escherichia coli and Pseudomonas aeruginosa) bacteria.Also,the antifungal activity of℃uO was investigated against Aspergillus niger,Rhizopus oryzae,Aspergillus flavus,Cladosporium carrionii,Mucor,Penicillium notatum and Alternaria alternata.Results demonstrate that the flower-shaped℃uO nanostructures act as an effective antimicrobial agent against pathogenic bacteria and fungi.
In the present work, flower-like ° uO nanostructures were synthesized by reflux condensation method without using any surfactants or templates. Structural analysis by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman studies revealed the formation of highly crystalline single phase ℃ uO, exhibiting monoclinic structure. Morphological analysis by field emission scanning electron microscopy (FESEM) showed flower-shaped ℃ uO hierarchical architecture made up of interpenetrating self-assembled nanosheets. Optical analysis by UVeVis diffused reflectance spectra (DRS) blue-shift in the optical band gap due to quantum confinement effect. Photoluminescence (PL) spectrum showed both UV as well as visible emissions. The antibacterial activity of flower-shaped ℃ uO nanostructures were tested against gram-positive (Bacillus subtilis, Bacillus thuringiensis ) and gram-negative (Salmonella paratyphi, Salmonella paratyphi-a, Salmonella paratyphi-b, Escherichia coli and Pseudomonas aeruginosa) bacteria. Also, the antifungal activity of ℃ uO was investigated against Aspergillus niger, Rhizopus oryzae, Aspergillus flavus, Cladosporium carrionii, Mucor, Penicillium notatum and Alternaria alternata. Results demonstrated that the flower-shaped structure uO nanostructures act as an effective antimicrobial agent against pathogenic bacteria and fungi.