Thermally induced anchoring of a zinc-carboxyphenylporphyrin on rutile TiO2 (110)

Johr, Res and Hinaut, Antoine and Pawlak, Remy and Zajac, Lukasz and Olszowski, Piotr and Such, Bartosz and Glatzel, Thilo and Zhang, Jun and Muntwiler, Matthias and Bergkamp, Jesse J. and Mateo, Luis-Manuel and Decurtins, Silvio and Liu, Shi-Xia and Meyer, Ernst. (2017) Thermally induced anchoring of a zinc-carboxyphenylporphyrin on rutile TiO2 (110). Journal of Chemical Physics, 146 (18). p. 184704.

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Official URL: http://edoc.unibas.ch/58441/

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Functionalization of surfaces has become of high interest for a wealth of applications such as sensors, hybrid photovoltaics, catalysis, and molecular electronics. Thereby molecule-surface interactions are of crucial importance for the understanding of interface properties. An especially relevant point is the anchoring of molecules to surfaces. In this work, we analyze this process for a zinc-porphyrin equipped with carboxylic acid anchoring groups on rutile TiO2 (110) using scanning probe microscopy. After evaporation, the porphyrins are not covalently bound to the surface. Upon annealing, the carboxylic acid anchors undergo deprotonation and bind to surface titanium atoms. The formation of covalent bonds is evident from the changed stability of the molecule on the surface as well as the adsorption configuration. Annealed porphyrins are rotated by 45 degrees and adopt another adsorption site. The influence of binding on electronic coupling with the surface is investigated using photoelectron spectroscopy. The observed shifts of Zn 2p and N 1s levels to higher binding energies indicate charging of the porphyrin core, which is accompanied by a deformation of the macrocycle due to a strong interaction with the surface.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:AIP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:11 Oct 2019 12:06
Deposited On:15 Jan 2018 14:43

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