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Preparation of PVP-coated copper oxide nanosheets as antibacterial and antifungal agents

Published online by Cambridge University Press:  11 November 2013

Mahdi Shahmiri ,
Nor Azowa Ibrahim ,
Fatemeh Shayesteh ,
Nilofar Asim  and
Nabi Motallebi
Mahdi Shahmiri
Affiliation:
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Nor Azowa Ibrahim*
Affiliation:
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Fatemeh Shayesteh
Affiliation:
School of Environmental Science and Natural Resources, Faculty of science and technology, University Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Nilofar Asim
Affiliation:
Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
Nabi Motallebi
Affiliation:
ACECR (Academic Center for Education, Culture and Research), 14155-4364 Tehran, Iran
*
a)Address all correspondence to this author. e-mail: inorazowa@yahoo.com
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Abstract

Copper oxide (CuO) nanosheets synthesized in polyvinylpyrrolidone (PVP) were characterized with respect to antimicrobial activity by quick precipitation method. Different sizes and shapes of CuO nanosheets were obtained by simple variations of PVP concentrations. The x-ray diffraction results revealed the formation of pure-phase CuO with monoclinic structure. Transmission electron microscopy analysis showed that the average ratio of length to width of these nanosheets increased with increasing PVP concentrations. Due to the quantum size effect, CuO nanosheets exhibit a blue shift in the ultraviolet-visible spectra. Field emission scanning electron microscopy results showed that as the concentration of PVP increased, well-defined morphologies were formed on the surface of the products. Energy dispersive analysis of x-ray clearly confirmed the presence of Cu and O with an atomic ratio of 1:1. Fourier transform infrared spectroscopy results showed that C=O in PVP coordinated with CuO and formed a protective layer. The mechanism of the reaction was also discussed. CuO nanosheets in suspension showed activity against a range of bacterial pathogens and fungi with minimum bactericidal concentrations (MBCs) ranging from 100 to 5000 µg/mL. The extent of the inhibition zones and the MBCs was found to be size-dependent.

Keywords

CuOquick precipitation methodnanosheetsantibacterial activitypolyvinylpyrrolidonecopper oxide
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 22 , 28 November 2013 , pp. 3109 - 3118
Copyright
Copyright © Materials Research Society 2013 

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