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Effects of A-elements (A=Si, Ge or Sn) on the structure and electrical contact properties of Ti-A-C-Ag nanocomposites
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
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2012 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 520, no 16, 5128-5136 p.Article in journal (Refereed) Published
Abstract [en]

Ti-A-C-Ag (A is Si, Ge or Sn) nanocomposite coatings have been deposited by dc magnetron sputtering in an ultra high vacuum chamber. Electron microscopy, energy-dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy, and x-ray diffraction show that all coatings contain nanocrystalline TiC and Ag grains in a matrix of mainly amorphous C. A C/Ti ratio above unity yields a homogenous distribution of Ag with a reduced grain size. From a chemical point of view. the addition of Ge and Sn to the Ti-C-Ag system should increase the conductivity of the coatings since the formation of more metallic phases than Si. We demonstrate that Si can be replaced with Ge and Sn and still yield a homogeneous distribution of Ag. The incorporation of Ge and Sn to the Ti-C-Ag system results in elemental precipitation and intermetallic phases, respectively. This gives improved electrical properties compared to Ti-Si-C-Ag coatings, and a contact resistance at loads of similar to 1 N against an Au probe (radius of 0.7 mm) that is comparable to that of Ag. 

Place, publisher, year, edition, pages
2012. Vol. 520, no 16, 5128-5136 p.
Keyword [en]
Multifunctional coatings, Nanocrystalline, Electron microscopy, Contact resistance, Titanium carbide, Silver
National Category
Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
URN: urn:nbn:se:uu:diva-177872DOI: 10.1016/j.tsf.2012.04.037ISI: 000305719000003OAI: oai:DiVA.org:uu-177872DiVA: diva2:541582
Available from: 2012-07-19 Created: 2012-07-19 Last updated: 2012-08-13Bibliographically approved

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Jansson, Ulf
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