Abstract
Silver-poly (dimethylsiloxane) nanocomposite films are prepared by an in-situ synthesis by incubating the polymer film in a silver nitrate aqueous solution and using the reducing properties of the polymer’s curing agent. Silver nanoparticles concentrated in the surface layer of the silver-poly (dimethylsiloxane) nanocomposite are further replaced by gold through a galvanic replacement reaction at the poly (dimethylsiloxane)/gold salt solution interface. It is demonstrated that, as a result of the galvanic replacement, the quasi-spherical silver nanoparticles uniformly distributed on the surface of the polymer are transformed into ribbon-like elongated gold aggregates. The formation of core-shell Ag-Au nanoparticles as an intermediate state of the low-temperature galvanic replacement is evidenced through microscopic and spectral methods. The collapse of this structure, in a later stage of the replacement, leads to the formation of elongated gold aggregates. The mechanism of the galvanic replacement under different conditions is investigated by closely following the evolution of the morphology, composition, and optical properties of the metal nanoparticles.
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Dr. P. Jeevanandam received his PhD in Chemistry from Indian Institute of Science, Banglore, India in 1998. He was Post-Doctoral Fellow at Department of Chemistry, Bar-Ilan University, ISRAEL with Prof. Aharon Gedanken and, later on, he joined Kansas State University as a Research Associate with Prof. Ken Klabunde. Currently, he is an Assistant Professor in the Department of Chemistry, Indian Institute of Technology, Roorkee. He and his lab members are actively involved in topics such as: adsorbents based on nanostructured materials, nanostructured inorganic materials, nanorods of metal oxides and metal sulphides, optical properties of nanomaterials. He has published about 30 research articles, written three book chapters and has a patent as well.
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Devi, P., Badilescu, S., Packirisamy, M. et al. Synthesis of gold-poly (dimethylsiloxane) nanocomposite through a polymer-mediated silver/gold galvanic replacement reaction. Gold Bull 43, 307–315 (2010). https://doi.org/10.1007/BF03215000
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DOI: https://doi.org/10.1007/BF03215000