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Water adsorption on...
Water adsorption on phosphorous-carbide thin films
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- Broitman, E. (författare)
- Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA
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- Furlan, Andrej (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Kostov Gueorguiev, Gueorgui (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Czigany, Zs. (författare)
- Res Inst Tech Phys and Mat Sci, H-1525 Budapest, Hungary
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- Tarditi, A M (författare)
- Univ Nacl Litoral, RA-3000 Santa Fe, Argentina
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- Gellman, A J (författare)
- Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA
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- Stafström, Sven (författare)
- Linköpings universitet,Beräkningsfysik,Tekniska högskolan
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- Hultman, Lars (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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(creator_code:org_t)
- Elsevier BV, 2009
- 2009
- Engelska.
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Ingår i: Surface & Coatings Technology. - : Elsevier BV. - 0257-8972 .- 1879-3347. ; 204:6-7, s. 1035-1039
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- 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.
Nyckelord
- Phosphorous carbide; Dangling bonds; Water adsorption; Density functional theory
- TECHNOLOGY
- TEKNIKVETENSKAP
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- art (ämneskategori)
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