The green and chemical synthesis, and characterization of ZnO nanoparticles by aqueous leaf extract of aloe vera

Abstract

The exact physical and chemical properties of nanoparticles depend on the way in which they are synthesized. The common techniques are hypothermal methods, electrochemical deposition, sol-gel method, chemical vapour deposition, co-precipitation method etc. In the present study, zinc oxide nanoparticles have been synthesized by botanical extract and chemical reducing agents with major objective to compare the nature and average particle size of the nanoparticles synthesized by these two methods. An attempt is also made to understand the influence of molarity on the chemically synthesized NPs by varying the molar concentration of precursor. The structure and morphology of synthesized NPs have been studied using X-ray diffraction (XRD) technique. For chemically synthesized NPs the major peak was observed at 36.147 for both the precursor at 0.2M and 0.3M. The average crystalline size was found to be 13.09 nm and 11.09 nm for precursor at 0.2M and 0.3M respectively. The major peak for green method was observed at 36.147 with an average crystalline size of 9.2 nm. The study clearly indicates that, green method is particularly suitable for the synthesis of smaller sized NPs.In chemical method, the molarity of the precursor influences the particle size, as the molarity decreases particle size also decreases.