Adsorption of 5-halouracils on Au(111)

0431377 - FZÚ 2015 RIV NL eng J - Článek v odborném periodiku
Plekan, O. - Feyer, V. - Tsud, N. - Vondráček, Martin - Cháb, Vladimír - Matolín, V. - Prince, K. C.
Adsorption of 5-halouracils on Au(111).
Surface Science. Roč. 606, 3-4 (2012), s. 435-443. ISSN 0039-6028. E-ISSN 1879-2758
Grant CEP: GA MŠMT(CZ) LC06058
Institucionální podpora: RVO:68378271
Klíčová slova: 5-halouracils * gold * chemisorption * XPS * NEXAFS
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.838, rok: 2012

The immobilization of 5-halouracils on Au(111) has been studied by soft X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. Multilayer and monolayer films of 5-chlorouracil were deposited on the Au(111) surface by evaporation in vacuum while films of 5- bromouracil were absorbed in two modes: from the gas phase under ultrahigh vacuum conditions and from solution. The photoemission spectra of C, N and O 1s, Br 3d and Cl 2p as well as the absorption spectra at the N and O K-edges were measured for monolayers of 5-halouracil films and the nature of the bonding with the Au(111) surface has been determined. From the angular dependence of the NEXAFS spectra at the O and K-edges, we conclude that these 5-halouracils are lying nearly parallel to the Au(111) surface. Distinct chemical states and surface adsorption geometry of the 5-BrU molecules for monolayer coverage prepared in two different ways have been found.
Trvalý link: http://hdl.handle.net/11104/0235926