title: Biosynthesis and stabilization of Au and Au-Ag alloy nanoparticles by fungus,Fusarium semitectum.
abstract: Crystallized and spherical-shaped Au and Au-Ag alloy nanoparticles have been synthesized and stabilized using a fungus,F. semitectumin an aqueous system. Aqueous solutions of chloroaurate ions for Au and chloroaurate and Ag+ions (1 : 1 ratio) for Au-Ag alloy were treated with an extracellular filtrate ofF. semitectumbiomass for the formation of Au nanoparticles (AuNP) and Au-Ag alloy nanoparticles (Au-AgNP). Analysis of the feasibility of the biosynthesized nanoparticles and core-shell alloy nanoparticles from fungal strains is particularly significant. The resultant colloidal suspensions are highly stable for many weeks. The obtained Au and Au-Ag alloy nanoparticles were characterized by the surface plasmon resonance (SPR) peaks using a UV-vis spectrophotometer, and the structure, morphology and size were determined by Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), and transmission electron microscopy (TEM). Possible optoelectronics and medical applications of these nanoparticles are envisaged.
authors.affiliation: Department of Chemistry, Gulbarga University, Gulbarga-585 106, India; Materials Chemistry Laboratory, Department of Materials Science, Gulbarga University, Gulbarga-585 106, India.
authors.forename: Balaji
authors.initials: B
authors.lastname: Dasaratrao Sawle
authors.affiliation: Department of Chemistry, Gulbarga University, Gulbarga-585 106, India; Materials Chemistry Laboratory, Department of Materials Science, Gulbarga University, Gulbarga-585 106, India.
authors.forename: Basavaraja
authors.initials: B
authors.lastname: Salimath
authors.affiliation: Materials Chemistry Laboratory, Department of Materials Science, Gulbarga University, Gulbarga-585 106, India; HKE's College of Pharmacy, Sedam Road, Gulbarga-585 102, India.
authors.forename: Raghunandan
authors.initials: R
authors.lastname: Deshpande
authors.affiliation: Materials Chemistry Laboratory, Department of Materials Science, Gulbarga University, Gulbarga-585 106, India.
authors.forename: Mahesh
authors.initials: M
authors.lastname: Dhondojirao Bedre
authors.affiliation: Department of Chemistry, Gulbarga University, Gulbarga-585 106, India.
authors.forename: Belawadi
authors.initials: B
authors.lastname: Krishnamurthy Prabhakar
authors.affiliation: Department of Chemistry, Gulbarga University, Gulbarga-585 106, India; Materials Chemistry Laboratory, Department of Materials Science, Gulbarga University, Gulbarga-585 106, India.
authors.forename: Abbaraju
authors.initials: A
authors.lastname: Venkataraman
keywords: biosynthesis; fungus; metal nanoparticles; surface plasmon resonance