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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)9383-9386
Number of pages4
JournalJournal of physical chemistry
Volume98
Issue number38
DOIs
Publication statusPublished - 1994 Jan 1
Externally publishedYes

Fingerprint

Adsorbates
Harmonic generation
Electrolytes
harmonic generations
electrolytes
perchloric acid
Anisotropy
plots
magnetic permeability
anisotropy
Acids
Electrons
Substrates
curves
electrons
1-thio-2,5-dihydroxybenzene

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Superlattice structure of an organic adsorbate on Au(111) in an aqueous electrolyte as probed by in situ second harmonic generation. / Kim, Sunghyun; Zhao, Ming; Scherson, Daniel Alberto; Choi, Kee Ju; Bae, In Tae.

In: Journal of physical chemistry, Vol. 98, No. 38, 01.01.1994, p. 9383-9386.

Research output: Contribution to journalArticle

Kim, Sunghyun ; Zhao, Ming ; Scherson, Daniel Alberto ; Choi, Kee Ju ; Bae, In Tae. / Superlattice structure of an organic adsorbate on Au(111) in an aqueous electrolyte as probed by in situ second harmonic generation. In: Journal of physical chemistry. 1994 ; Vol. 98, No. 38. pp. 9383-9386.
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