Open AccessGamma Radiolytic Formation of Alloyed Ag-Pt Nanocolloids
Author(s) -
Mayur Temgire,
Jayesh Bellare,
Satyawati S. Joshi
Publication year - 2011
Publication title -
advances in physical chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.269
H-Index - 17
eISSN - 1687-7993
pISSN - 1687-7985
DOI - 10.1155/2011/249097
Subject(s) - radiolysis , bimetallic strip , materials science , colloid , absorption (acoustics) , absorption spectroscopy , particle size , pulmonary surfactant , alloy , analytical chemistry (journal) , metal , chemistry , nuclear chemistry , aqueous solution , organic chemistry , metallurgy , biochemistry , physics , quantum mechanics , composite material
Colloidal dispersions of Ag-Pt composite nanoparticles were prepared by gamma radiolysis technique in the presence of nonionic surfactant Brij'97. Simultaneous as well as sequential reduction methods were employed in order to study the structural formation of Ag-Pt bimetallic clusters. Similar shape and trend was observed in optical spectra for both methods. Radiolysis yielded nearly spherical Ag-Pt bimetallic clusters by use of AgNO3 instead of AgClO4. The disappearance of the silver resonance and the simultaneous growth of the 260 nm resonance are independent of cluster structure and degree of alloying. To understand formation of Ag-Pt aggregate, the optical studies were also done as a function of amount of dose absorbed, concentration of surfactant, that is, Brij'97. The shape of the absorption spectrum did not change with increase in gamma radiation dose. TEM analysis exhibited fine dispersions of Ag-Pt clusters surrounded by a mantle when capped with Brij'97. The particle size obtained was in the range of 5–9 nm. On the basis of optical, XRD, and TEM analysis, alloy formation is discussed
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