Risk Reduction Via Greener Synthesis of Noble Metal Nanostructures and Nanocomposites

Abstract

Aqueous preparation of nanoparticles using vitamins B2 and C which can function both as reducing and capping agents are described. Bulk and shape- controlled synthesis of noble nanostructures via microwave (MW)-assisted spon- taneous reduction of noble metal salts using α-D-glucose, sucrose, and maltose has been achieved. The MW method also accomplishes the cross-linking reaction of poly (vinyl alcohol) (PVA) with metallic systems such as Pt, Cu, and In; bimetallic systems, namely Pt-In, Ag-Pt, Pt-Fe, Cu-Pd, Pt-Pd and Pd-Fe; and single-walled nanotubes (SWNT), multi-walled nanotubes (MWNT), and Buckmin- sterfullerene (C-60). The strategy is extended to the formation of biodegradable carboxymethyl cellulose (CMC) composite films with noble nanometals; such metal decoration and alignment of carbon nanotubes in CMC is possible using a MW approach. The MW approach also enables the shape-controlled bulk synthesis of Ag and Fe nanorods in poly (ethylene glycol) (PEG).