Stability of radical-functionalized gold surfaces by self-assembly and on-surface chemistry

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Abstract

We have investigated the radical functionalization of gold surfaces with a derivative of the perchlorotriphenylmethyl (PTM) radical using two methods: by chemisorption from the radical solution and by on-surface chemical derivation from a precursor. We have investigated the obtained self-assembled monolayers by photon-energy dependent X-ray photoelectron spectroscopy. Our results show that the molecules were successfully anchored on the surfaces. We have used a robust method that can be applied to a variety of materials to assess the stability of the functionalized interface. The monolayers are characterized by air and X-ray beam stability unprecedented for films of organic radicals. Over very long X-ray beam exposure we observed a dynamic nature of the radical-Au complex. The results clearly indicate that (mono)layers of PTM radical derivatives have the necessary stability to withstand device applications.

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Junghoefer, T., Nowik-Boltyk, E. M., De Sousa, J. A., Giangrisostomi, E., Ovsyannikov, R., Chassé, T., … Casu, M. B. (2020). Stability of radical-functionalized gold surfaces by self-assembly and on-surface chemistry. Chemical Science, 11(34), 9162–9172. https://doi.org/10.1039/d0sc03399e

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