Self-assembled monolayer formation from decaneselenol on polycrystalline gold as characterized by electrochemical measurements, quartz-crystal microbalance, XPS, and IR spectroscopy

Koji Nakano, Takeshi Sato, Masato Tazaki, Makoto Takagi

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    59 Citations (Scopus)

    Abstract

    Self-assembled monolayer (SAM) formation from decaneselenol on gold substrate surfaces was studied using electrochemical measurements, reflection-absorption Fourier transform infrared spectroscopy (FT-IRRAS), X-ray photoelectron spectroscopy (XPS), and quartz-crystal microbalance (QCM). The Au substrate modified with the SAMs showed clear IR absorption bands corresponding to the CH stretches while distinct photoemission peaks were observed at C 1s, Se 3d, and Se 3p core levels in its XPS spectrum. Using a quartz-crystal microbalance, the surface coverage by the SAM-forming molecule was determined to be 0.88 nmol cm-2. Electrochemical impedance measurements revealed frequency-dependent capacitive behavior of the SAM, and the equivalent parameter was determined to be 6.1×10-6 sφ Ω-1 cm-1 (φ = 0.94). It also showed that the surface coverage of 99.8% can be attained, resulting in the suppression of a heterogeneous electron-transfer rate constant for a redox species dissolved in solution phase. The dielectric constant for the monolayer film was calculated to be 5.0, which was closer to that of alkanethiols than that reported for diphenyl diselenide. Decaneselenol was concluded to adsorb on Au surfaces to form stable monolayers such as alkanethiols.

    Original languageEnglish
    Pages (from-to)2225-2229
    Number of pages5
    JournalLangmuir
    Volume16
    Issue number5
    DOIs
    Publication statusPublished - Mar 7 2000

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Spectroscopy
    • Electrochemistry

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