Open Access Nano Express

An Organic Metal/Silver Nanoparticle Finish on Copper for Efficient Passivation and Solderability Preservation

Bernhard Wessling*, Marco Thun, Carmen Arribas-Sanchez, Sussane Gleeson, Joerg Posdorfer, Melanie Rischka and Bjoern Zeysing

Author Affiliations

Ormecon GmbH, Ferdinand-Harten-Str. 7, Ammersbek, 22949, Germany

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Nanoscale Research Letters 2007, 2:455-460  doi:10.1007/s11671-007-9086-0

Published: 29 August 2007

Abstract

For the first time, a complex formed by polyaniline (in its organic metal form) and silver has been deposited on copper in nanoparticulate form. When depositing on Cu pads of printed circuit boards it efficiently protects against oxidation and preserves its solderability. The deposited layer has a thickness of only nominally 50 nm, containing the Organic Metal (conductive polymer), polyaniline, and silver. With >90% (by volume), polyaniline (PAni) is the major component of the deposited layer, Ag is present equivalent to a 4 nm thickness. The Pani‚ÄďAg complex is deposited on Cu in form of about 100 nm small particles. Morphology, electrochemical characteristics, anti-oxidation and solderability results are reported.

Keywords:
Conductive polymer; Organic metal; Nanoparticle; Cu passivation; Printed circuit board soldering