Biosynthesis of Silver Nanowires by Extract of R.Capsulate

摘要

An environmentally friendly method using a cell-free extract (CFE) of Rhodopseudomonas capsulata is proposed to synthesize silver nanowires with a network structure. This procedure offers control over the shapes of silver nanoparticles with the change of AgNO3 concentration. The CFE solutions were added with different concentrations of AgNO3, resulting in the bioreduction of silver ions and biosynthesis of morphologies of silver nanostructures. It is probable that proteins acted as the major biomolecules involved in the bioreduction and synthesis of silver nanoparticles. At a lower concentration of silver ions, exclusively spherical silver nanoparticles with sizes ranging from 10 to 20 nm were produced, whereas silver nanowires with a network structure formed at the higher concentration of silver ions in the aqueous solution. This method is expected to be applicable to the synthesis of other metallic nanowires such as silver and platinum, and even other anisotropic metal nanostructures are expected using the biosynthetic methods.