Physical and chemical properties of the chromium/polyphenylquinoxaline interface

Abstract

Kinetic energy influences on the growth mode of metal overlayers on dendrimer mediated substrates J. Vac. Sci. Technol. A 21, 234 (2003); 10.1116/1.1531137 Evidence for metal interaction in gold metallized polycarbonate films: An x-ray photoelectron spectroscopy investigationThe very first stages of the chromium/polyphenylquinoxaline interface formation are investigated. X-ray photoelectron spectroscopy data evidence that new carbon and nitrogen electron-rich species are formed, necessarily implying cycle opening and bond breaking, associated with polymer disruption. Complementary experiments performed on chromium nitride and on chromium deposited on amorphous carbon films show that mostly chromium carbides and nitrides are formed during chromium interaction with the polymer. The outermost topography is studied by ex situ near-field microscopies. Chromium, with its high reactivity towards the polymer, essentially grows in a layer-by-layer mode. However, for chromium coverages higher than 60 Å, a dense network of cracks spontaneously forms, indicating a mixed-mode failure ͑cohesive in the chromium film and adhesive at the interface͒.

Nitrogen defects and ferromagnetism in Cr-doped dilute magnetic semiconductor AlN from first principles

“…Our calculated result is μAlN = −3.33 eV for AlN, and we use known data μCrN = −1.30 eV for CrN 43 . For a single neutral N-vacancy in AlN under poor N condition, we have n VN = 1 and n Cr = 0, and thus the formation energy is -0.23 eV, while the formation energy of a single N + vacancy is 0.1 eV 44 .…”