Superlattice structure of an organic adsorbate on Au(111) in an aqueous electrolyte as probed by in situ second harmonic generation

Sunghyun Kim, Ming Zhao, Daniel Alberto Scherson, Kee Ju Choi, In Tae Bae

研究成果: Article査読

8 被引用数 (Scopus)

抄録

The superlattice structure of 2,5-dihydroxythiophenol (DHTP) irreversibly adsorbed on Au(111) in 0.1 M perchloric acid was determined in situ based on dual resonant, rotational anisotropy, second harmonic generation (RA-SHG) measurements. Plots of the intensity of the SH light as a function of the azimuthal angle displayed two clearly defined 3-fold pattern features. These curves were analyzed in terms of a model which regards the total interfacial nonlinear susceptibility as the sum of contributions due to the molecular overlayer itself and due to the attenuated substrate. A statistical fit to these data was found to be consistent with a (√7 × √7)R19.1° superstructure for the DHTP/Au(111) adlayer for which the surface coverage (θ) is 1/7. This value of θ was found to be in excellent agreement with that calculated from the normalized charge under the surface-confined two-electron hydroquinone/quinoane voltammetric peaks observed for the same precise DHTP/ Au(111) interface.

本文言語English
ページ(範囲)9383-9386
ページ数4
ジャーナルJournal of physical chemistry
98
38
DOI
出版ステータスPublished - 1994 1 1
外部発表はい

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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