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Open Access NANO EXPRESS

Formation of ZnO Micro-Flowers Prepared via Solution Process and their Antibacterial Activity

Rizwan Wahab1, Young-Soon Kim1, Amrita Mishra2, Soon-Il Yun2 and Hyung-Shik Shin1*

Author Affiliations

1 Energy Materials & Surface Science Laboratory, Solar Research Center, School of Chemical Engineering, Chonbuk National University, Jeonju, 561-756, Republic of Korea

2 Department of Food Science and Technology, College of Agriculture and Life Sciences, Chonbuk National University, Jeonju, 561-756, Republic of Korea

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Nanoscale Research Letters 2010, 5:1675-1681  doi:10.1007/s11671-010-9694-y

Published: 1 August 2010

Abstract

This paper presents the fabrication and characterization of zinc oxide micro-flowers and their antibacterial activity. The micro-flowers of zinc oxide composed of hexagonal nanorods have been prepared via solution process using precursor zinc acetate di-hydrate and sodium hydroxide in 3 h of refluxing time at ~90°C. The antibacterial activities of grown micro-flowers were investigated against four pathogenic bacteria namely S. aureus, E. coli, S. typhimurium and K. pneumoniae by taking five different concentrations (5–45 μg/ml) of ZnO micro-flowers (ZnO-MFs). Our investigation reveals that at lowest concentration of ZnO-MFs solution inhibiting the growth of microbial strain which was found to be 5 μg/ml for all the tested pathogens. Additionally, on the basis of morphological and chemical observations, a chemical reaction mechanism of ZnO-MFs composed of hexagonal nanorods was also proposed.

Keywords:
E. coli; S. aureus; X-ray diffraction pattern; ZnO micro-flowers and antibacterial activity