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1 2004

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New Methods to Study Thin Organic Films at Electrode Surfaces

Zawisza I., Cai X., Zamlynny V., Burgess I., Majewski J., Szymański G., Lipkowski J.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1165-1181

Chronocoulometry, scanning tunneling microscopy (STM), neutron reflectometry (NR) and in situ polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) have been employed to study the properties of a monolayer of n-octadecanol at a Au(111) electrode surface. Chronocoulometry has been used to determine the charge density at the electrode surface covered by the film of n-octadecanol. The surface pressure of this film was calculated from the charge density data. The film pressure data were used to describe the film properties at the gold solution interface. It has been found that at film pressures larger than 12 mNm-1 the monolayer is in a compressed state and at lower film pressures in a decompressed state. STM imaging, NR and PM-IRRAS have been employed to determine the nature of the two states.We have demonstrated that the properties of a monolayer of n-octadecanol at the metal-solution interface display many similarities to the properties of an equivalent film at the air-solution interface.