Nanoscale characterization of thin immersion silver coatings on copper substrates

Tamas I. Török, Eva Kun, Daniel Sos, Attila Csik, József Hakl, Kálmán Vad, László Kövér, József Tóth, Sándor Mészáros

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Microelectronic-grade copper foils were immersion silver plated in a home-made non-cyanide alkaline silver nitrate - thiosulfate solution and in two commercially available industrial baths via contact reductive precipitation. The concentration depth profiles of the freshly deposited silver layers were afterwards analyzed at nanoscale resolution by means of Secondary Neutral Mass Spectrometry (SNMS) and Glow Discharge Optical Emission Spectroscopy (GDOES). The thickness of deposited silver layers obtained were in the range of 50?150 nm, depending on the parameters of the immersion procedure. Slight contamination of sulfur from the thiosulfate bath was detectable. Traces of Cr and Na could be observed as well around the interface between the copper substrate and silver deposit. The results also indicate that storage for longer time in air especially at higher than ambient temperatures induces a kind of ageing effect in the deposited layer, changing its composition. The samples were also analyzed by the X-ray photoelectron spectroscopy (XPS) to identify the chemical state of the silver.

Original languageEnglish
Title of host publicationNational Association for Surface Finishing Annual Conference and Trade Show, SUR/FIN 2014
PublisherNational Association for Surface Finishing
Pages111-133
Number of pages23
ISBN (Electronic)9781634391368
Publication statusPublished - Jan 1 2014
EventNational Association for Surface Finishing Annual Conference and Trade Show, SUR/FIN 2014 - Cleveland, United States
Duration: Jun 9 2014Jun 11 2014

Publication series

NameNational Association for Surface Finishing Annual Conference and Trade Show, SUR/FIN 2014

Other

OtherNational Association for Surface Finishing Annual Conference and Trade Show, SUR/FIN 2014
CountryUnited States
CityCleveland
Period6/9/146/11/14

Keywords

  • Copper
  • Depth profiles
  • Displacement
  • GDOES
  • Immersion coating
  • SNMS
  • Silver

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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  • Cite this

    Török, T. I., Kun, E., Sos, D., Csik, A., Hakl, J., Vad, K., Kövér, L., Tóth, J., & Mészáros, S. (2014). Nanoscale characterization of thin immersion silver coatings on copper substrates. In National Association for Surface Finishing Annual Conference and Trade Show, SUR/FIN 2014 (pp. 111-133). (National Association for Surface Finishing Annual Conference and Trade Show, SUR/FIN 2014). National Association for Surface Finishing.