by R. Gago, I. Jiménez, J. Neidhardt, B. Abendroth, I. Caretti, L. Hultman and W. Möller
Abstract:
The bonding structure of highly ordered fullerenelike (FL) carbon nitride (CNx) thin films has been assessed by x-ray absorption near-edge spectroscopy (XANES). Samples with different degrees of FL character have been analyzed to discern spectral signatures related to the FL microstructure. The XANES spectra of FL−CNx films resemble that of graphitic CNx, evidencing the sp2 hybridization of both C and N atoms. The FL structure is achieved with the promotion of N in threefold positions over pyridinelike and cyanidelike bonding environments. In addition, the relative π∗∕σ∗ XANES intensity ratio at the C(1s) edge is independent of the FL character, while it decreases ∼40% at the N(1s) edge with the formation of FL arrangements. This result indicates that there is no appreciable introduction of C−sp3 hybrids with the development of FL structures and, additionally, that a different spatial localization of π electrons at C and N sites takes place in curved graphitic structures. The latter has implications for the elastic properties of graphene sheets and could, as such, explain the outstanding elastic properties of FL−CNx.
Reference:
R. Gago, I. Jiménez, J. Neidhardt, B. Abendroth, I. Caretti, L. Hultman and W. Möller, “Correlation between bonding structure and microstructure in fullerenelike carbon nitride thin films”, Physical Review B, vol. 71, no. 12, pp. 125414.
Bibtex Entry:
@article{gago_correlation_2005,
title = {Correlation between bonding structure and microstructure in fullerenelike carbon nitride thin films},
volume = {71},
url = {https://link.aps.org/doi/10.1103/PhysRevB.71.125414},
doi = {10.1103/PhysRevB.71.125414},
abstract = {The bonding structure of highly ordered fullerenelike (FL) carbon nitride (CNx) thin films has been assessed by x-ray absorption near-edge spectroscopy (XANES). Samples with different degrees of FL character have been analyzed to discern spectral signatures related to the FL microstructure. The XANES spectra of FL−CNx films resemble that of graphitic CNx, evidencing the sp2 hybridization of both C and N atoms. The FL structure is achieved with the promotion of N in threefold positions over pyridinelike and cyanidelike bonding environments. In addition, the relative π∗∕σ∗ XANES intensity ratio at the C(1s) edge is independent of the FL character, while it decreases ∼40% at the N(1s) edge with the formation of FL arrangements. This result indicates that there is no appreciable introduction of C−sp3 hybrids with the development of FL structures and, additionally, that a different spatial localization of π electrons at C and N sites takes place in curved graphitic structures. The latter has implications for the elastic properties of graphene sheets and could, as such, explain the outstanding elastic properties of FL−CNx.},
number = {12},
urldate = {2017-10-06},
journal = {Physical Review B},
author = {Gago, R. and Jiménez, I. and Neidhardt, J. and Abendroth, B. and Caretti, I. and Hultman, L. and Möller, W.},
month = mar,
year = {2005},
pages = {125414},
file = {APS Snapshot:E:\cmam_papers\files\1052\PhysRevB.71.html:text/html;APS Snapshot:E:\Usuarios\Administrator\Zotero\storage\XZWTYQMT\PhysRevB.71.html:text/html},
}