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In situ scanning tunneling microscopic and spectroscopic investigation of magnetron-sputtered C and CN thin films
Linkoping Univ, Dept Phys, Thin Film Phys Div, S-58183 Linkoping, Sweden Linkoping Univ, Dept Phys, Div Appl Phys, S-58183 Linkoping, Sweden Linkoping Univ, Dept Phys, Div Appl Phys, S-581 Linkoping, Sweden Chalmers Univ Technol, Off President, S-41296 Gothenburg, Sweden.
Linkoping Univ, Dept Phys, Thin Film Phys Div, S-58183 Linkoping, Sweden Linkoping Univ, Dept Phys, Div Appl Phys, S-58183 Linkoping, Sweden Linkoping Univ, Dept Phys, Div Appl Phys, S-581 Linkoping, Sweden Chalmers Univ Technol, Off President, S-41296 Gothenburg, Sweden.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.ORCID iD: 0000-0002-2837-3656
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2000 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 61, no 7, 4898-4903 p.Article in journal (Refereed) Published
Abstract [en]

Carbon and carbon nitride films, grown in argon or nitrogen discharges by reactive Jc magnetron sputtering of a graphite target, were characterized by in situ scanning tunneling microscopy. When the growth temperature increased from ambient to 800 degrees C, we observed a topographic evolution of the carbon films from an amorphous to a graphitelike structure, and further to a distorted-graphitic phase with curved and intersecting basal planes, and finally to a surface containing nanotubes and nanodomes. When nitrogen was incorporated into the films, distortion of the graphitic basal planes occurred at a lower temperature compared to the pure carbon case. At temperatures of similar to 200 degrees C and above, regions of a nongraphitic phase, containing a high degree of carbon sp(3) bonds were observed. Spatially resolved tunneling spectroscopic measurements indicated that the band gaps were 0, similar to 0-0.6 eV, and similar to 0.4-2.0 eV for graphitelike structures, the distorted-graphitic phase, and the nongraphitic phase, respectively. Together with ex sial x-ray photoelectron spectroscopy and reflection electron energy loss spectroscopy measurements, the results suggest that the incorporation of nitrogen promotes bending of the graphitic basal planes and thereby facilitates the formation of three-dimensional covalently bonded networks with a high degree of sp(3)-coordinated carbon atoms.

Place, publisher, year, edition, pages
2000. Vol. 61, no 7, 4898-4903 p.
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-49840OAI: oai:DiVA.org:liu-49840DiVA: diva2:270736
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12

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Hultman, LarsErlandsson, Ragnar

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