Abstract
Amorphous hydrogen-free carbon films (sp2-dominated a-C) were deposited under ultrahigh vacuum conditions between room temperature and 800°C. These films served as matrices for the in-situ incorporation of alkali-metal atoms (Li, Na). In-situ sample characterization was performed by photoelectron spectroscopy with both x-ray and ultraviolet excitation (XPS, UPS). While the clean metal-containing samples were prepared with metal contents of about 10 at%, a strong oxidation driven accumulation of metal atoms on the film surface exceeding 50 at% was observed upon exposure to molecular oxygen. Work-function measurements by UPS reflected the changes within the electronic structure of the material. Metal incorporation considerably decreased the work-function, but only after oxidation we observed work-functions below the values given for pure alkali metals.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M.S. Dresselhaus and G. Dresselhaus, Adv. Phys. 30, 139 (1981).
J.R. Dahn, T. Zheng, Y. Liu, and J.S. Xue, Science 270, 590–593 (1995).
G.L. Jackson, E.A. Lazarus, G.A. Navratil, R. Bastasz, N.H. Brooks, D.T. Garnier, K.L. Holtrop, J.C. Phillips, E.S. Marmar, T.S. Taylor, D.M. Thomas, W.R. Wampler, D.G. Whyte, W.P. West, J. Nucl. Mater. 241-243, 655–659 (1997).
G. Janeschitz, G. Janeschitz, K. Borrass, G. Federici, Y. Igitkhanov, A. Kukushkin, H.D. Pacher, G.W. Pacher, M. Sugihara, J. Nucl. Mater. 220-222, 73–88 (1995).
S. Schelz, T. Richmond, P. Kania, P. Oelhafen, and H.-J. Güntherodt, Surf. Sci. 359, 227–236 (1996).
M. Töwe, P. Reinke, and P. Oelhafen, to be submitted
P.H. Citrin, G.K. Wertheim, Y. Baer, Phys. Rev. B 16, 4256–4282 (1977).
M. Nakadaira, R. Saito, T. Kimura, G. Dresselhaus, and M.S. Dresselhaus, J. Mater. Res. 12, 1367–1375 (1997).
D.R. Lide (Ed.), CRC Handbook of Chemistry and Physics, 78th ed. (CRC Press, Boca Raton New York, 1997).
K. Wandelt, Surf. Sci. Rep. 2, 1–121 (1982).
H. Estrade-Szwarckopf and B. Rousseau, J. Phys. Chem. Solids 53, 419–436 (1992).
B. Rousseau, M. Vayer-Besanqon, and H. Estrade-Szwarckopf, Solid State Comm. 99, 143–147 (1996).
J. Hrbek, Y.W. Yang, and J.A. Rodriguez, Surf. Sci. 296, 164–170 (1993).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Töwe, M., Reinke, P. & Oelhafen, P. Alkali-Metal Containing Amorphous Carbon: Reactivity and Electronic Structure. MRS Online Proceedings Library 593, 167–172 (1999). https://doi.org/10.1557/PROC-593-167
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-593-167