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Digitale Medien

Observation of the early stages of growth and the formation of growth spirals in epitaxial YBa2Cu3O7-δ thin films by AFM (1994)

Burger, J. ; Lippert, M. ; Dorsch, W. ; [weitere]

Springer

Applied physics 59 (1994), S. 49-56

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Details

ISSN: 1432-0630

Schlagwort(e): 68.55 ; 61.70 ; 74.70

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract Ultrathin epitaxial films of YBa2Cu3O7−δ on SrTiO3 prepared by Direct Current (DC) sputtering and pulsed laser deposition were imaged by Atomic Force Microscopy (AFM) to follow the different stages of growth of the thin films. Series of films with thicknesses between 1.2 nm and 12 nm (1–10 monolayers of YBa2Cu3O7−δ) were prepared under identical conditions, optimized with respect to electrical and structural properties, to obtain information on the mechanisms responsible for the formation of growth spirals which are commonly observed in films having a thickness of several 10 nm or more. It could be shown that few layers are formed by a layered growth mode where material is attached laterally to 2D islands which are only one c-axis unit cell in height. In a later stage of growth when about 8–10 layers have been formed, the growth process changes to a mode which is mediated by growth spirals. This could be directly monitored in the AFM images where different defect structures like vertically sheared growth fronts and dendrite-like terraces of stacked islands as well as the resulting growth spirals could be identified.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00348419

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Digitale Medien

Gas-liquid chromatography of amino acids: Columns and methodology as a basis for routine amino acid analysis using glass capillary gas chromatography (1981)

Moodie, I. M. ; Burger, J.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 4 (1981), S. 218-223

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Details

ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary, glass ; Column preparation ; “Split” vs. “on-column” injection ; Amino acid analysis, quantitative 10 ng level ; Average relative standard deviation 1% ; Fish muscle protein analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A carefully Standardized technique is described for the preparation of glass capillary columns which can be used successfully for routine quantitative amino acid analysis. Comparison is made between two different modes of sample injection. Preliminary quantitative results from “split” injection and “on-column” injection techniques are evaluated statistically and it is concluded that the “on-column” system is a prerequisite for quantitative amino acid analysis by glass capillary gas chromatography. An analysis of fish muscle protein hydrolyzate illustrates an application of this technique and results are compared with those from a packed column analysis.

Zusätzliches Material: 4 Ill.