Title Electronic structure and conductivity of nanocomposite metal (Au, Ag, Cu, Mo)-containing amorphous carbon films
Authors ENDRINO ARMENTEROS, JOSÉ LUIS, Horwat D. , Gago R. , Andersson J. , Liu Y.S. , Guo J. , Anders A.
External publication Si
Means Solid State Sci.
Scope Article
Nature Científica
JCR Quartile 2
SJR Quartile 1
JCR Impact 1.67500
SJR Impact 0.83300
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-70349307492&doi=10.1016%2fj.solidstatesciences.2008.08.007&partnerID=40&md5=e90389f228e674eb6b8dc90a92814866
Publication date 01/01/2009
ISI 000271331900003
Scopus Id 2-s2.0-70349307492
DOI 10.1016/j.solidstatesciences.2008.08.007
Abstract In this work, we study the influence of the incorporation of different metals (Me = Au, Ag, Cu, Mo) on the electronic structure of amorphous carbon (a-C:Me) films. The films were produced at room temperature using a species selective bias pulsed dual-cathode arc deposition technique. Compositional analysis was performed with secondary neutral mass spectroscopy whereas X-ray diffraction was used to identify the formation of metal nanoclusters in the carbon matrix. The metal content incorporated in the nanocomposite films induces a drastic increase in the conductivity, in parallel with a decrease in the band-gap corrected from Urbach energy. The electronic structure as a function of the Me content has been monitored by X-ray absorption near edge structure (XANES) at the C K-edge. XANES showed that the C host matrix has a dominant graphitic character and that it is not affected significantly by the incorporation of metal impurities, except for the case of Mo, where the modifications in the line shape spectra indicated the formation of a carbide phase. Subtle modifications of the spectral line shape are discussed in terms of nanocomposite formation. © 2008 Elsevier Masson SAS.
Keywords Arc deposition; Band gaps; Carbide phase; Carbon matrix; Compositional analysis; Conductivity; Graphitic characters; Host matrices; Line shape; Metal content; Metal impurities; Metal incorporation; Me
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