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Quasi-linear Assemblies of Silver Nanoparticles by Highly Localized Anodic Dissolution of Copper in the Hydrosol

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Abstract:

The assembly of silver nanoparticles into quasi-linear superstructures in solution has been demonstrated. A small dc voltage applied to fine-tipped, L-shaped copper electrodes immersed in aqueous carboxylic acid-derivatized silver nanoparticle solution leads to the anodic dissolution of copper ions. The controlled release of Cu2+ ions within the gaps results in local screening of repulsive coulombic interactions between the silver nanoparticles and the consequent formation of aggregates that are extremely stable in time. Atomic force and transmission electron microscopy images of the silver nanoparticle solution after application of an electric field showed the presence of a large number of silver nanoparticle assemblies in open, quasi-linear structures. Such open structures do not form if Cu2+ ions are added directly to the silver nanoparticle solution.

Keywords: AFM; ANODIC DISSOLUTION; NANOPARTICLE ASSEMBLY; NANOWIRES; SILVER; SURFACE MODIFICATION

Document Type: Communications

DOI: http://dx.doi.org/10.1166/jnn.2002.106

Affiliations: 1: Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India 2: Materials Science and Nuclear Engineering Department, University of Maryland, College Park, Maryland 20742-2115, USA

Publication date: April 1, 2002

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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