Enhancing the Antibacterial Efficiency of ZnO Nanopowders Synthesized by Combustion Method Through Ag + Fe Co-doping

doi:10.1007/s40195-015-0340-7

Abstract

Abstract:

(Ag + Fe)-doped ZnO nanopowders have been synthesized using combustion method. Ag doping level was kept as 2 at.%, and Fe doping level was varied from 3 to 6 at.%, and the structural, optical, surface morphological, and antibacterial properties have been investigated. The structural studies show that ZnO/(Ag + Fe) nanopowders have hexagonal wurtzite structure with a preferential orientation along the (101) plane. The FE-SEM images indicate that there is a gradual decrease in the grain size with the increase in the doping level of Fe, and the TEM images are correlated well with FE-SEM images. The XPS profile clearly confirms the presence of expected elemental composition. Photoluminescence studies reveal the presence of extrinsic defects in the material. Antibacterial activity of Ag- and Fe-doped ZnO nanopowders against Vibrio parahaemolyticus, Vibrio Cholerae, and Staphylococcus aureus bacteria was also investigated.

Key words: ZnO/Ag/Fe nanopowders, Combustion route, SEM, TEM, Antibacterial activities

P. Sathish, K. Ravichandran, B. Sakthivel, A. Panneerselvam. Enhancing the Antibacterial Efficiency of ZnO Nanopowders Synthesized by Combustion Method Through Ag + Fe Co-doping[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(11): 1407-1413.

Figures/Tables 11

Fig. 1 XRD patterns of Ag (2 at.%)- and Fe (3 at.% and 6 at.%)-doped ZnO nanopowders

Table 1 Structural parameters of ZnO/Ag (2 at.%)/Fe (3 at.%, 6 at.%) nanopowders

Sample	Lattice constant^a (10^-1 nm)		D (nm)	V (10^-3 nm³)
Sample	‘a’	‘c’	D (nm)	V (10^-3 nm³)
ZnO/Ag(2)	3.245	5.204	42	47.45
ZnO/Ag/Fe(3)	3.243	5.201	37	47.41
ZnO/Ag/Fe(6)	3.241	5.199	33	47.38

Fig. 2 FTIR spectra of doped ZnO nanopowders

Fig. 3 Room temperature PL spectra of doped ZnO nanopowders

Fig. 4 FESEM images of Ag 2 at.% (a) and Ag + Fe 6 at.% (b)-doped ZnO nanopowders

Fig. 5 EDAX spectrum of Ag + Fe 6 at.% -doped ZnO nanopowder

Fig. 6 TEM micrographs of Ag- 2 at.% (a) and Ag + Fe 6 at.% (b)-doped ZnO nanopowders

Fig. 7 XPS spectrum of doped ZnO nanopowders

Fig. 8 High-resolution XPS spectra of O (a), Zn (b), Ag (c) and Fe (d)

Fig.9 Variation in zone of inhibition as a function of 2 at.% Ag and 3 at.%, 6 at.% Fe doping

Fig. 10 Zone of inhibition of 2 at.% Ag and 3 at.% and 6 at.% Fe-doped ZnO nanopowders against V. Cholerae (a), V. Parahaemolyticus bacteria (b), S. aureus (c)

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