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Morphology-directed synthesis of ZnO nanostructures and their antibacterial activity

Ramani, Meghana; Ponnuswamy, S.; Muthamizhchelvana, Chellamuthu; Cullen, Joseph; Krishnamurthy, Satheesh and Marsili, Enrico (2013). Morphology-directed synthesis of ZnO nanostructures and their antibacterial activity. Colloids and Surfaces B: Biointerfaces, 105 pp. 24–30.

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Zinc oxide (ZnO) nanostructures of various morphologies were produced in an aqueous system, with pyridine as a shape-directing agent. X-ray diffraction (XRD) and selected-area electron diffraction (SAED) revealed hexagonal wurtzite crystal structure. Variation in surface morphology was analyzed using transmission electron microscopy (TEM). Changes in surface morphology were attributed to the absence of steric stabilization in pyridine during synthesis process. Pyridine concentration affected morphology and optical properties. Fourier transform infrared spectroscopy (FTIR) confirmed the presence/absence of pyridine on the surface of ZnO nanostructures (ZnO-NSs). Optical measurements carried out using UV–visible spectrophotometer (UV–vis) and photoluminescence (PL) indicated the presence of defects. All the samples exhibited two PL peaks, at 350–370 nm and 560–624 nm. Variation in the intensities of PL peaks corresponded to the changes in the surface morphology from nanoparticles to rods and origin of deep-level defect luminescence is attributed to surface recombination. The toxicity of the nanostructures was tested on model Gram-negative and Gram-positive pathogens. Smaller nanorods were most toxic among the nanostructures tested.

Item Type: Journal Item
Copyright Holders: 2013 Elsevier B.V.
ISSN: 1873-4367
Keywords: zinc oxide; nanostructures; surface defects; oxygen vacancies; antibacterial activity
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 36670
Depositing User: Satheesh Krishnamurthy
Date Deposited: 21 Feb 2013 10:11
Last Modified: 11 Dec 2018 15:00
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