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10 Mar 2003

Volume 82, Issue 10, pp. 1497-1639

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 1610 (2003); http://dx.doi.org/10.1063/1.1559439 (3 pages)

Yong Chen, Douglas A. A. Ohlberg, Xuema Li, Duncan R. Stewart, R. Stanley Williams, Jan O. Jeppesen, Kent A. Nielsen, J. Fraser Stoddart, Deirdre L. Olynick, and Erik Anderson
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Coalescence of nanometer silver islands on oxides grown by filtered cathodic arc deposition

Eungsun Byon, Thomas W. H. Oates, and André Anders

Appl. Phys. Lett. 82, 1634 (2003); http://dx.doi.org/10.1063/1.1558955 (3 pages) | Cited 20 times

Online Publication Date: 4 March 2003

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Ultrathin silver films have been deposited on glass and oxide-coated glass using filtered cathodic arc deposition and, for comparison, magnetron sputtering. The energetic differences between these deposition methods lead to initially different film properties. Silver films made by cathodic arc deposition show an earlier onset of island coalescence, indicating a lower aspect ratio than islands produced by evaporation and sputtering. However, the as-deposited films are thermodynamically unstable, exhibiting changes on a timescale of minutes. While films of islands tend to increase their sheet resistance with time, the sheet resistance of contiguous films shows a decrease. Both effects can be explained by silver mobility driven to minimize film and interfacial energy. © 2003 American Institute of Physics.
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68.55.-a Thin film structure and morphology
73.61.At Metal and metallic alloys
81.15.Kk Vapor phase epitaxy; growth from vapor phase

Point x-ray source using graphite nanofibers and its application to x-ray radiography

Takahiro Matsumoto and Hidenori Mimura

Appl. Phys. Lett. 82, 1637 (2003); http://dx.doi.org/10.1063/1.1558969 (3 pages) | Cited 32 times

Online Publication Date: 4 March 2003

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A point x-ray emission was obtained from a diode configuration composed of a graphite-nanofiber cold cathode and a conical-shaped copper metal anode. When combined with a highly sensitive charge coupled device (CCD) camera with a scintillator, this x-ray source was then used to obtain x-ray transmission images of a tungsten mesh and an x-ray test chart. The spatial resolution of this x-ray radiography system was on the order of 10 μm and the acquisition time for these images was less than 10 s. This combination of the point x-ray source and the sensitive detection system offers a high-resolution x-ray radiography system. © 2003 American Institute of Physics.
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07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
81.70.Ex Nondestructive testing: electromagnetic testing, eddy-current testing
84.47.+w Vacuum tubes
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