Characterization of Green Synthesized Copper Nanoparticles Stabilized by Ocimum Leaf Extract
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Characterization of Green Synthesized Copper Nanoparticles Stabilized by Ocimum Leaf Extract Sathiraju Annapurna1, Yathapu Suresh2, Bojja Sreedhar3, Ganghishetti Bhikshamaiah2, A.K.Singh4 1
Department of Physics, Osmania University College for Women, Hyderabad-500095, India Department of Physics, Osmania University, Hyderabad-500007, India 3 Indian Institute of Chemical Technology, Hyderabad-500007, India 4 Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500058, India 2
ABSTRACT Copper nanoparticles are synthesized successfully through chemical reduction of different copper salts stabilized by Ocimum Sanctum Leaf extract, a natural biopolymer. The resulting copper nanoparticles are characterized by using UV Visible Absorption Spectrometer, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Small Angle X-ray Scattering (SAXS) and Fourier Transform Infrared Spectroscopy (FTIR) experiments. Copper nanoparticles prepared display an absorption peak at around 558 nm. X-ray diffraction analysis shows that the particles are FCC crystalline. SEM and TEM display the formation of copper nanoparticles with an average size of 10 nm. The SAXS studies demonstrate the formation of spherical nanoparticles with bimodal size distribution. The FTIR spectrum analysis has confirmed the presence of functional groups of stabilizer Ocimum Sanctum leaf extract in capping the copper nanoparticles. Keywords: green synthesis, copper, nanoparticle, chemical reduction, Ocimum Sanctum Leaf INTRODUCTION Copper based nanomaterials are of great interest because of their wide range of applications in the field of metallurgy, catalysis, nano and optoelectronics [1-3]. Green synthesis of nanoparticles is a type of bottom-up approach where the main reaction occurring is reduction/oxidation. Green Synthesis of metal nanoparticles using natural products is very cost effective, so it can be used as an economic and valid alternative for the large-scale production of metal nanoparticles. Several methodologies have been proposed to control the nanomaterial properties such as size and shape; these include metal vapor deposition, thermal decomposition and chemical reduction etc. Chemical reduction is the highly preferred method among all other methods as it is simple and economical. It was reported that the two stage chemical reduction process is necessary to avoid the formation of copper oxide [4-7]. The synthesis of nanoparticles by reduction in aqueous solutions and precipitation of the nanoparticles is a novel approach where there are many parameters such as temperature, reaction time, precursor and reducing agent type affecting on nucleation, growth and agglomeration phenomena and consequently the particle size distribution [8-11]. EXPERIMENTAL
Synthesis of copper nanoparticles All chemicals used were of analytical reagent grade. Copper chloride, copper sulphate, copper nitrate, L-Ascorbic acid, NaOH, and Hydrazine Hydrate (HH) were used as received. All solutions were made with Millipo
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