Bonding structure in amorphous carbon nitride: A spectroscopic and nuclearmagnetic resonance study

Citation
Jc. Sanchez-lopez et al., Bonding structure in amorphous carbon nitride: A spectroscopic and nuclearmagnetic resonance study, J APPL PHYS, 90(2), 2001, pp. 675-681
Citations number
34
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
00218979 → ACNP
Volume
90
Issue
2
Year of publication
2001
Pages
675 - 681
Database
ISI
SICI code
0021-8979(20010715)90:2<675:BSIACN>2.0.ZU;2-3
Abstract
Since the prediction of Liu and Cohen [Science 245, 841 (1989)] of the pote ntial extraordinary mechanical properties of crystalline beta -C3N4, many a uthors have attempted its synthesis. However, in most cases, the obtained m aterials are amorphous phases with a complex bonding structure. Their chara cterization is complicated due to the absence of a reference compound, the lack of long-range order, and the poor knowledge about their bonding struct ure. In this article, we present H-1, C-13, and N-15 solid-state nuclear ma gnetic resonance (NMR) measurements for the determination of the bonding ty pes in amorphous CNx films. NMR measurements do not require long-range orde r and are able to clearly identify the signals from the sp(2)- and sp(3)-bo nded phases. The analysis of the data obtained by other characterization te chniques, such as infrared spectroscopy, x-ray photoelectron spectroscopy, electron energy-loss spectroscopy, and x-ray absorption near-edge spectrosc opy on the same sample, based on the information acquired by NMR, enables t he description of a structure model for the studied amorphous-CNx phase pre pared by dc-magnetron sputtering and to revise the interpretation found in the literature. (C) 2001 American Institute of Physics.