Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 73: Poster Metal and Semiconductor Substrates: Adsorption and Reactions of Small Molecules

O 73.9: Poster

Mittwoch, 19. März 2025, 18:00–20:00, P2

Adsorption of bifunctional methoxy butene on Si(001): the multiplicity of non-selective adsorption — •Jannick Peters, Sophie Göbel, and Michael Dürr — Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Germany

Both, ether group and C=C double bond, adsorb on Si(001) via an intermediate state and with high reactivity. When combining these two functional groups in a bifunctional organic molecule, a variety of different adsorption configurations can be envisioned. However, selective adsorption via the ether group was found for allyl ethers on the Si(001) surface [1]. In the case of methoxy butene (MeBut), the functional groups are separated by an additional CH₂ group when compared to allyl ethers. Despite this seemingly small change in the molecules’ structure, major differences in the reactivity on Si(001) were observed. At surface temperatures between 90 and 450 K, no selective reaction but a large variety of different adsorption configurations, which are bound either via ether cleavage, the C=C double bond, or both functional groups, was observed when studying intermediates and final products by means of XPS. Depending on the final configuration, the reactivity of the ether group was found to be either enhanced or reduced, which results in an increased temperature window for the reaction from intermediate to final state.

[1] T. Glaser, et al., J. Phys. Chem. Lett. 15, 7168 (2024).

Keywords: silicon surface; organic molecules; adsorption; XPS