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Synthesis, Structural, Optical Properties and Antibacterial activity of co-doped (Ag, Co) ZnO Nanoparticles

Author Affiliations

  • 1Department of Physics, Sri Venkateswara University, Tirupati 517502, Andhra Pradesh, INDIA
  • 2Center for Nanoscience and Engineering (CeNSE), Indian Institute of Science, Bangalore-560 012, INDIA
  • 3Department of Microbiology, Sri Venkateswara University, Tirupati-517 502, A.P., INDIA

Res. J. Material Sci., Volume 1, Issue (1), Pages 11-20, February,16 (2013)

Abstract

In this paper, undoped ZnO and 5 mol% of Ag, 5 mol% of Co individually doped and co-doped (Ag, Co) ZnO nanopowders were synthesized by chemical co-precipitation method and their structural, morphological, optical properties and antibacterial activity were studied. Crystal structure and grain size were characterized by X-ray diffractometer and reveals that all synthesized ZnO samples were hexagonal structure and the sizes of ZnO nanoparticles were 23 nm, 20 nm, 17 nm, and 25 nm for undoped ZnO, 5 mol% of Co doped, 5 mol% of Ag doped and co-doped (Ag, Co) ZnO nanoparticles respectively. Field emission scanning electron microscopy (FESEM) and Transmission electron microscope (TEM) characterizations were used to determine the morphology and size of the ZnO nanoparticles. TEM results were in good agreement with the X-rd results. Energy dispersive analysis of X-rays spectroscopy (EDAX) spectrum indicates that the successful dopants of Ag, Co peaks in the ZnO lattice and which indicates the purity of the samples. Optical properties of the ZnO samples were characterized by UV-Vis Diffuse Reflectance spectrophotometer. The antibacterial activity test was carried out via well diffusion method, and antibacterial activity of the prepared samples of undoped, Co doped, Ag doped and co-doped (Ag, Co) ZnO nanoparticles were reported, against pathogenic organisms like Pseudomonas, Klebshiella, Aspergillus and Candida. The co-doped (Ag, Co) ZnO nanoparticles show twice as potent in killing as against those pathogenic organisms compared to undoped ZnO and was also more effective than the single element Ag doped, Co doped ZnO nanoparticles. The present study indicates that single element doped and co-doped ZnO nanoparticles could potentially be antibacterial reagents to treat diseases caused by bacteria and fungi.

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