Estimation of average orientation of surface-confined chromophores on electrode surfaces using electroreflectance spectroscopy

Takamasa Sagara, Norimasa Kaba, Masaharu Komatsu, Mikio Uchida, Naotoshi Nakashima

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    A novel method was proposed to estimate the orientation of chromophores confined on a planar electrode surface using electroreflectance (ER) spectroscopy (potential-modulated UV-vis reflectance spectroscopy). The intensity ratio of the ER response to p-polarized and s-polarized incident light was formulated in an equation as a function of incident angle and the orientation of the chromophore by adopting approximations. The method was applied to estimate the orientation of viologen cation radical chromophore in a monolayer of N-butyl-N′-(4-mercaptobutyl)-4,4′-bipyridinium dihexafluorophosphate adsorbed on a gold electrode. The orientation of the long axis of the viologen cation radical was found to be approximately 70° with respect to the surface normal. Both two-phase and three-phase models were examined and the validity of these models was discussed.

    Original languageEnglish
    Pages (from-to)2183-2193
    Number of pages11
    JournalElectrochimica Acta
    Volume43
    Issue number14-15
    DOIs
    Publication statusPublished - May 7 1998

    All Science Journal Classification (ASJC) codes

    • Chemical Engineering(all)
    • Electrochemistry

    Fingerprint Dive into the research topics of 'Estimation of average orientation of surface-confined chromophores on electrode surfaces using electroreflectance spectroscopy'. Together they form a unique fingerprint.

    Cite this