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  • 1995-1999  (1)
  • 1980-1984  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of crystal faces of polycrystalline HFCVD diamond films by STM/STS (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 335-338 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Among the numerous techniques available for the characterization of diamond films scanning tunnelling microscopy (STM) in combination with spectroscopy (STS) provides information about the morphology and electronic surface properties down to the atomic scale. Here results of STM/STS obtained on diamond films are reported. 0.5 to 1.25 μm thick films have been grown on silicon substrates by hot filament chemical vapour deposition (HFCVD) by variable CH4/H2 mixtures in the range of 0.5% to 3% CH4. Morphological features of diamond crystallites were studied in detail by STM. A distinct increase of the surface roughness of (111) crystal faces with increasing CH4 concentration (from 0.5% to 3%) was found. For a CH4 concentration of 3% (100) faces were smoother than (111) faces. STS revealed significant differences in the tunneling current/voltage (I/V)-characteristics between (111) and (100) crystal surfaces. For (111) surfaces distinct changes in the I/V-characteristics depending on the CH4 concentration were observed: The I/V-characteristics change and the conductivity increases raising the CH4 concentration from 0.5% to 3%. This effect is explained with increasing formation of non-diamond carbon (NDC) on (111) surfaces for higher CH4 concentrations. Thus NDC is also responsible for the enhanced surface roughness observed on (111) surfaces with increasing CH4 concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050422
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Beteiligung anaerober Bakterien an odontogen-pyogenen Infektionen (1980)
    Springer
    Infection 8 (1980), S. 275-278 
    Details
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The aerobic and anaerobic bacterial flora of dental abscesses and the bacterial resistance were studied. Mixtures of endogenous aerobic and anaerobic bacteria are characteristic in pyogenic dental infections. The organisms were generally highly susceptible to antibiotics.
    Notes: Zusammenfassung Im Rahmen einer Filterstudie wird das aerobe und anaerobe Keim- und Resistenzspektrum odontogener Abszesse untersucht. Aerob-anaerobe Bakterienkomplexe endogenen Ursprungs sind charakteristisch für odontogen-pyogene Infektionen, wobei sich die Keime gegenüber Antibiotika insgesamt als sehr sensibel erweisen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01640918
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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