title: Spectral anion sensing and γ-radiation induced magnetic modifications of polyphenol generated Ag-nanoparticles.
abstract: A fast one step bio-synthesis for in situ preparation of silver nanoparticles is proposed. The method involves reduction of AgNO3 with an aqueous extract of peanut skin, which is a good source of polyphenols. The silver nanoparticles thus synthesized were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-Vis absorption spectroscopy, Fourier Transform infrared (FTIR) spectroscopy and magnetic measurements. Effect of low dose γ irradiation during the synthesis was studied and their physico-chemical properties were compared with those produced without irradiation. On the contrary to the diamagnetic behavior of bulk silver, the silver nanoparticles thus prepared show a significant ferromagnetic moment component. Variable time exposure to γ-irradiation results in an exponential decay of ferromagnetic component. A freshly prepared solution of silver nanoparticles shows selective spectral changes towards iodide ions at trace concentration (below 50 μM) among a series of 16 other competing anions. The prepared nanoparticles are therefore suitable for anion sensing application.
authors.affiliation: Department of Chemistry, University of Calcutta, 92, APC Road, Kolkata 700009, India.
authors.forename: Zarina
authors.initials: Z
authors.lastname: Ansari
authors.affiliation: CMP Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India.
authors.forename: Susmita
authors.initials: S
authors.lastname: Dhara
authors.affiliation: CMP Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India.
authors.forename: Bilwadal
authors.initials: B
authors.lastname: Bandyopadhyay
authors.affiliation: UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8, Bidhannagar, Kolkata 700098, India.
authors.forename: Abhijit
authors.initials: A
authors.lastname: Saha
authors.affiliation: Department of Chemistry, University of Calcutta, 92, APC Road, Kolkata 700009, India. Electronic address: kamalchem.roy@gmail.com.
authors.forename: Kamalika
authors.initials: K
authors.lastname: Sen
mesh_terms: D000838:Anions / Q000032:analysis; D005720:Gamma Rays; D007454:Iodides / Q000032:analysis*; D059346:Magnets / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D059808:Polyphenols / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000838:Anions; D007454:Iodides; D059808:Polyphenols; D012834:Silver
keywords: Ag-nanoparticles; Anion sensing; Magnetism; Polyphenols