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Stable self-assembled monolayers on ferromagnetic 3d metals

The carboxylic group of prototypical benzoate molecules is found to ensure a thermally robust anchoring and strong electronic coupling of organic monolayers to 3d transition metals such as Ni, Co and Fe, at the same time hindering facile dissociation on these reactive surfaces.

R. Han et al., Chem. Commun. 52, 9805 (2016).

By using temperature-programmed photoelectron spectroscopy, X-ray absorption spectroscopy and the core-hole-clock technique we demonstrate that the anchoring of self-assembled monolayers (SAMs) to ferromagnetic transition metal (Ni, Co, Fe) surfaces via a carboxylate group provides chemically well-defined SAMs that are stable far above room temperature (350-400 K, depending on the metal) and exhibit excellent electronic communication for ultrafast charge transport. This finding is at variance with the analogous thiolate-bonded SAMs, which only have limited stability (up to 200 K). These results hold promise for boosting the research on carboxylate SAMs on ferromagnetic

transition metal surfaces directed to model applications in spin-dependent electronics.

Retrieve article
Toward interfacing organic semiconductors with ferromagnetic transition metal substrates: enhanced stability via carboxylate anchoring ;
R. Han, F. Blobner, J. Bauer, D.A. Duncan, J.V. Barth, P. Feulner, and F. Allegretti;
Chem. Commun. 52, 9805-9808 (2016).

Last Updated on Wednesday, 09 May 2018 11:42