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O: Fachverband Oberflächenphysik
O 98: Metal and Semiconductor Substrates: Adsorption and Reactions of Small Molecules
O 98.4: Vortrag
Freitag, 21. März 2025, 11:15–11:30, H8
Selectivity on and off: adsorption of allyl ethers on Si(001) — •Sophie Göbel1, Timo Glaser1, Alexa Adamkiewicz2, Jannick Peters1, Julian Heep1, Ulrich Höfer2, and Michael Dürr1 — 1Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Germany — 2Fachbereich Physik, Philipps-Universität Marburg, Germany
Adsorption of organic molecules with more than one functional group on solid surfaces is of importance in the field of molecular electronics as they can be the starting point for multilayer systems [1]. To obtain well-organized monolayers of such bifunctional molecules, the understanding of their adsorption behavior, in particular in terms of their selectivity, is mandatory.
For allyl methyl ether (AME) and allyl ethyl ether (AEE), which combine an ether group with a C=C double bond, we show by means of XPS and STM that the adsorption of these molecules on Si(001) proceeds selectively via ether cleavage up to room temperature. The results are surprising as both functional groups involved show in general high reactivity on Si(001) and the ether group is less reactive when the isolated functional groups are compared. In contrast to AME and AEE, no such selectivity was observed for methoxy butene, where both functional groups are separated by an additional CH2 unit. The results are discussed in terms of the interplay of electronic and geometric structure and its influence on the adsorption process.
[1] T. Glaser, et al., Chem. Mater. 36, 561 (2024).
Keywords: silicon surface; organic molecules; adsorption; XPS; STM