Abstract
A low-cost, green and reproducible probiotic microbe (Lactobacillus sporogens) mediated biosynthesis of ZnO nanoparticles is reported. The synthesis is performed akin to room tem-perature in five replicate samples. X-ray and transmission electron microscopy analyses are performed to ascertain the formation of ZnO nanoparticles. Rietveld analysis to the X-ray data indicated that ZnO nanoparticles have hexagonal unit cell structure. Individual nanoparticles having the size of 5-15 nm are found. A possible involved mechanism for the synthesis of ZnO nanoparticles has been pro-posed. The H2S adsorption characteristic of ZnO nanoparticles has also been assayed.
Highlights
Nature by dint of its diversity provides exponential possibilities in terms of endearing adaptability of its constituent cohorts
Zinc oxide (ZnO) is considered to be a technologically prodigious material having a wide spectrum of applications such as that of a semiconductor (Eg = 3.37 eV), magnetic material, electroluminescent material, UV-absorber, piezoelectric sensor and actuator, nanostructure varistor, field emission displaying material, thermoelectric material, gas sensor, constituent of cosmetics etc. [3,4,5,6,7,8,9] There are several synthesis procedures for the preparation of ultrafine oxide nanoparticles such as solgel, hydrothermal, solvothermal, flame combustion, emulsion precipitation, fungus mediated biosynthesis, etc. [10,11,12,13,14,15,16] Each method has its own merits and demerits
Recent research devoted towards the study of interaction between inorganic substances and biological systems has highlighted its potential application for the production of nanomaterials with interesting technological properties. [1,2,17,18,19,20] Numerous recent publications have highlighted the potential for microbes, bacteria and fungi, to synthesize metallic and/or oxide nanoparticles. [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35] The facultative nature of Lactobacilli, offers the potential to produce nanoparticles under both oxidizing and reducing conditions. [2,18,35]
Summary
Nature by dint of its diversity provides exponential possibilities in terms of endearing adaptability of its constituent cohorts. Both bacteria and fungi make such an exciting category of microorganisms having naturally bestowed property of reducing/oxidizing metal ions into metallic/oxide nanoparticles thereby functioning as ‘mini’ nano-factories. [1,2,17,18,19,20] Numerous recent publications have highlighted the potential for microbes, bacteria (including thermophilies) and fungi, to synthesize metallic and/or oxide nanoparticles. Recent research devoted towards the study of interaction between inorganic substances and biological systems has highlighted its potential application for the production of nanomaterials with interesting technological properties. [1,2,17,18,19,20] Numerous recent publications have highlighted the potential for microbes, bacteria (including thermophilies) and fungi, to synthesize metallic and/or oxide nanoparticles. [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35] The facultative nature of Lactobacilli, offers the potential to produce nanoparticles under both oxidizing and reducing conditions. [2,18,35]
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