Electrode surface modification by a spirobifluorene derivative. An XPS and electrochemical investigation

Francesca Cecchet, Giulia Fioravanti, Massimo Marcaccio, Massimo Margotti, Leonardo Mattiello, Francesco Paolucci, Stefania Rapino, Petra Rudolf

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Abstract

Ordered thin layers of a spirobifluorene derivative containing an amino group were formed by grafting them onto a self-assembled monolayer (SAM) of 11-mercaptoundecanoic acid (11-MUA) on gold. Either physical (H-bonding) or chemical bonding (activated by EDC1) was investigated. X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy confirmed that both methods can be used to effectively graft 2-amino-9,9′-spirobifluorene molecules onto the SAM surface, giving high surface coverages, with a significantly higher packing in the case of chemisorbed films. EIS measurements also showed that the covalently bonded spirobifluorene SAMs act as an effective barrier to both ion penetration and heterogeneous electron transfer.

Original languageEnglish
Pages (from-to)18427-18432
Number of pages6
JournalJournal of Physical Chemistry B
Volume109
Issue number39
DOIs
Publication statusPublished - Oct 6 2005

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Cecchet, F., Fioravanti, G., Marcaccio, M., Margotti, M., Mattiello, L., Paolucci, F., Rapino, S., & Rudolf, P. (2005). Electrode surface modification by a spirobifluorene derivative. An XPS and electrochemical investigation. Journal of Physical Chemistry B, 109(39), 18427-18432. https://doi.org/10.1021/jp051786w