Electroreflectance study of gold nanoparticles immobilized on an aminoalkanethiol monolayer coated on a polycrystalline gold electrode surface

Takamasa Sagara, Naoyuki Kato, Naotoshi Nakashima

    研究成果: Contribution to journalArticle査読

    78 被引用数 (Scopus)

    抄録

    Citrate-stabilized gold (Au) nanoparticles of a diameter of 11 nm were immobilized on a monolayer of aminoundecanethiol (1-mercapto-11-aminoundecane) coated on a polycrystalline Au electrode surface. A quartz crystal microbalance measurement of the deposition process of the Au particles revealed that the saturated deposition amount is 10% of a 2D close-packed monoparticle layer, and this coverage was confirmed by an atomic force microscopy (AFM) observation. The Au particle layer was characterized by the use of potential-modulated UV-visible reflectance spectroscopy (electroreflectance spectroscopy). The electroreflectance (ER) band at the plasmon absorption wavelength of the Au particles was positive-going, indicating that the plasmon absorption becomes stronger when changing the electrode potential to more negative. The plasmon absorption band shifted to longer wavelength when the electrode potential approaches to the potential of zero-charge, Epzc, of the Au electrode. The ER signal intensity also showed a maximum around Epzc. In light of good electronic communication between the Au electrode substrate and the deposited Au particles as demonstrated by reversible redox waves of solution phase species, the ER signal was interpreted as being originated from the potential-dependent charging-discharging process of the immobilized Au particles; a more negatively charged Au particle exhibits a stronger and sharper plasmon absorption band at a shorter wavelength. The implications of the ER signal were discussed.

    本文言語英語
    ページ(範囲)1205-1212
    ページ数8
    ジャーナルJournal of Physical Chemistry B
    106
    6
    DOI
    出版ステータス出版済み - 2 14 2002

    All Science Journal Classification (ASJC) codes

    • 物理化学および理論化学
    • 表面、皮膜および薄膜
    • 材料化学

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