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Water adsorption on phosphorous-carbide thin films
Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0001-9402-1491
Res Inst Tech Phys and Mat Sci, H-1525 Budapest, Hungary.
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2009 (Engelska)Ingår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 204, nr 6-7, s. 1035-1039Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Amorphous phosphorous-carbide films have been considered as a new tribological coating material with unique electrical properties. However, such CPx films have not found practical use until now because they tend to oxidize/hydrolyze rapidly when in contact with air. Recently, we demonstrated that CPx thin films with a fullerene-like structure can be deposited by magnetron sputtering, whereby the structural incorporation of P atoms induces the formation of strongly bent and inter-linked graphene planes. Here, we compare the uptake of water in fullerene-like phosphorous-carbide (FL-CPx) thin films with that in amorphous phosphorous-carbide (a-CPx), and amorphous carbon (a-C) thin films. Films of each material were deposited on quartz crystal substrates by reactive DC magnetron sputtering to a thickness in the range 100-300 nm. The film microstructure was characterized by X-ray photoelectron spectroscopy, and high resolution transmission electron microscopy. A quartz crystal microbalance placed in a vacuum chamber was used to measure their water adsorption. Measurements indicate that FL-CPx films adsorbed less water than the a-CPx and a-C ones. To provide additional insight into the atomic structure of defects in the FL-CPx and a-CPx compounds, we performed first-principles calculations within the framework of density functional theory. Cohesive energy comparison reveals that the energy cost formation for dangling bonds in different configurations is considerably higher in FL-CPx than for the amorphous films. Thus, the modeling confirms the experimental results that dangling bonds are less likely in FL-CPx than in a-CPx and a-C films.

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2009. Vol. 204, nr 6-7, s. 1035-1039
Nyckelord [en]
Phosphorous carbide; Dangling bonds; Water adsorption; Density functional theory
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:liu:diva-52884DOI: 10.1016/j.surfcoat.2009.06.003OAI: oai:DiVA.org:liu-52884DiVA, id: diva2:285773
Tillgänglig från: 2010-01-13 Skapad: 2010-01-12 Senast uppdaterad: 2017-12-12

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Furlan, AndrejKostov Gueorguiev, GueorguiStafström, SvenHultman, Lars

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