Domnick R, Held G, Koschel H, Ammon C, Steinrück HP (2001)
Publication Type: Journal article
Publication year: 2001
Original Authors: Domnick R., Held G., Koschel H., Ammon Ch., Steinrück H.-P.
Publisher: Elsevier
Pages Range: 1292-1297
DOI: 10.1016/S0039-6028(01)00717-8
Temperature-dependent structural changes of Ni monolayers on Cu(111) and the adsorption of benzene on these layers were investigated using photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED). Ni films evaporated at 120 K show a sharp (1 x 1) LEED pattern after annealing to 300 K. Further annealing to 600 K leads to the segregation of Cu atoms on top of the Ni film. This is seen from the appearance of a surface core level shift in the Cu 2p XPS signal. The Ni2p signal does not show any shifts in this temperature range; only annealing to 800 K leads to a change in the Ni 2p peak energy which indicates the formation of a Cu-Ni bulk alloy. Adsorption of benzene on the Ni-adlayer (annealed to 300 K) causes a small peak shift in the Ni 2p signal. The C 1s signal indicates molecularly chemisorbed benzene up to 300 K. Further annealing to 500 K leads to the decomposition of benzene into hydrogen and carbon which remains on the surface and forms a stable bond with the Ni-adlayer, preventing Cu segregation up to 500 K. © 2001 Elsevier Science B.V. All rights reserved.
APA:
Domnick, R., Held, G., Koschel, H., Ammon, C., & Steinrück, H.-P. (2001). Segregation effects and chemical properties of nickel monolayers on Cu(1 1 1). Surface Science, 1292-1297. https://doi.org/10.1016/S0039-6028(01)00717-8
MLA:
Domnick, Ralph, et al. "Segregation effects and chemical properties of nickel monolayers on Cu(1 1 1)." Surface Science (2001): 1292-1297.
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