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|Type:||Artigo de periódico|
|Title:||Hydrogen Induced Changes On The Electronic Structure Of Carbon Nitride Films|
|Abstract:||The effect of hydrogen on the electronic structure of amorphous carbon-nitrogen alloys (a-CNx) prepared by ion beam assisted (IBAD) deposition was studied by photoelectron spectroscopy. The effect of H on the local bonding structure of C and N atoms was inferred from the changes of the C 1s and N 1s core-level and the top of valence band spectra. The core-level spectrum of H free films are constituted of two N 1s peaks identified as N bonded to sp3 C and N bonded to sp2 C, respectively. On increasing H content, the peak area ratio A(sp3)/A(sp2) decreases and a new component associated with NH bonds emerges at 399.1 eV. Simultaneously, new features are observed at the top of the valence band. Besides the increasing NH absorption band (3350 cm-1), infrared spectra suggest a modification of the former disordered aromatic rings to a more linear configuration. All the experimental information indicate that H promotes a polymeric-like structure. © 1998 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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