Hesse, E. and Creighton, J.A. (1999) Investigation by surface-enhanced Raman spectroscopy of the effect of oxygen and hydrogen plasmas on adsorbate-covered gold and silver island films. Langmuir, 15 (10). pp. 3545-3550. ISSN 0743-7463.
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The effects of radio-frequency-excited oxygen and hydrogen plasmas on gold island films with adsorbed CN-, thiophenate, or p-nitrobenzoate ions have been investigated by surface-enhanced Raman spectroscopy (SERS). An oxygen plasma caused oxidation of adsorbed CN- to Au(CN)(4)(-), and there was evidence of oxidation of the adsorption site gold atoms at the Au/p-nitrobenzoate surface, while in a hydrogen plasma Au(CN)(4)(-) was reduced back to adsorbed CN-. No adsorbed oxidation or reduction products of thiophenate or p-nitrobenzoate were detected, however. Exposure of gold films to an oxygen or hydrogen plasma also caused partial removal of the adsorbates, though with some loss of SERS activity, and in a hydrogen plasma thiophenate was preferentially removed from a gold film with coadsorbed thiophenate and CN-. On silver films, hydrogen plasma treatment almost completely removed adsorbed CN- with only a small loss of SERS activity, but in an oxygen plasma the films were rapidly destroyed.
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences|
|Depositing User:||I.T. Ekpo|
|Date Deposited:||07 Apr 1914 21:57|
|Last Modified:||07 Apr 1914 21:57|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/16843 (The current URI for this page, for reference purposes)|
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