NEXAFS investigations of NTCDA monolayers on different metal substrates

• Published in: Journal of electron spectroscopy and related phenomena Vol. 101; pp. 523 - 528
• Main Authors: Gador, D, Zou, Y, Buchberger, C, Bertram, M, Fink, R, Umbach, E
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.1999
• Subjects: Metal substrates; Naphthalene-tetracarboxylic acid anhydride; Near-edge X-ray absorption fine structure spectroscopy; Naphthalene-tetracarboxylic acid anhydride; Cu; Metal substrates; Near-edge X-ray absorption fine structure spectroscopy; Ni; Ag
• ISSN: 0368-2048; 1873-2526
• DOI: 10.1016/S0368-2048(98)00486-1

The interaction of naphthalene-tetracarboxylic acid dianhydride (NTCDA) monolayers with Ag(111), Cu(100) and Ni(111) substrate surfaces has been investigated by near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The C and O K-edge spectra drastically change for monolayers compared to multilayers thus reflecting a strong covalent bonding to the metal substrate. Whereas for Ag substrates the π*-resonances attributed to the naphthalene core are mainly affected by the substrate interaction, the anhydride groups are more involved in the molecular bonding to Cu substrates and even more for Ni substrates. In the latter case one may even speculate about molecular dissociation, in particular upon thermal treatment of the films.