Gamma Radiation Assisted Biosynthesis Of Silver Nanoparticles And Their Characterization

R. Madhu Kumar1, B. Lakshmeesha Rao1, S. Asha1, B. Narayana2, K. Byrappa3, Youjiang Wang4, Donggang Yao4, Y. Sangappa1,4*

1Department of Studies in Physics, Mangalore University, Mangalagangotri, Mangalore 574 199, India

2Department of Studies in Chemistry, Mangalore University, Mangalagangotri, Mangalore 574 199, India

3Department of Materials Science, Mangalore University, Mangalagangotri, Mangalore 574 199, India

4School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Adv. Mater. Lett., 2015, 6 (12), pp 1088-1093

DOI: 10.5185/amlett.2015.6002

Publication Date (Web): Nov 24, 2015

E-mail: syhalabhavi@yahoo.co.in

Abstract


Silver nanoparticles (AgNPs) were synthesized in situ under gamma radiation environment at room temperature using aqueous silk fibroin (SF) solution obtained from Bombyx mori silk. The formation of the Ag NPs was confirmed by its characteristic surface plasmon resonance (SPR) band at around 424 nm in UV-visible spectra. The strength of the photoluminescence (PL) spectra decreases with increasing dosage reveals the optimum dose required for the synthesis of silver nanoparticles. Dynamic light scattering (DLS) measurement indicated the dose dependent size of the Ag NPs formed in the solution. The transmission electron microscopy (TEM) images showed that the formed nanoparticles are roughly spherical in shape. Further the X-ray diffraction (XRD) analysis confirms the nanocrystalline phase of silver with FCC crystal structure. From this study, it was found that the increasing the radiation dose increases the rate of reduction and decreases the particle size. The size of the Ag NPs can be tuned by controlling the radiation dose.

Keywords

Silk fibroin, gamma radiation, silver nanoparticles, UV-visible, XRD, TEM.

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