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Journal articles

Stability of gold/silica thin film interface: Electrochemical and surface plasmon resonance studies

Abstract : This article reports chemical stability studies of a gold film electrode coated with thin silicon oxide (SiOx) layers using electrochemical, surface plasmon resonance (SPR) and atomic force microscopy (AFM) techniques. Silica films with different thicknesses (d = 6.4, 9.7, 14.5, and 18.5 nm) were deposited using a plasma-enhanced chemical vapor deposition technique (PECVD). For SiOx films with d ≥ 18.5 nm, the electrochemical behavior is characteristic of a highly efficient barrier for a redox probe. SiOx films with thicknesses between 9.5 and 14.5 nm were found to be less efficient barriers for electron transfer. The Au/SiOx interface with 6.4 nm of SiOx, however, showed an enhanced steady-state current compared to that of the other films. The stability of this interface in solutions of different pH was investigated. Whereas a strongly basic solution led to a continuous dissolution of the SiOx interface, acidic treatment produced a more reticulated SiOx film and improved electrochemical behavior. The electrochemical results were corroborated by SPR measurements in real time and AFM studies.
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https://hal.archives-ouvertes.fr/hal-00333549
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Submitted on : Thursday, October 23, 2008 - 3:02:54 PM
Last modification on : Wednesday, March 23, 2022 - 3:51:34 PM

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Sabine Szunerits, Yannick Coffinier, Sébastien Janel, Rabah Boukherroub. Stability of gold/silica thin film interface: Electrochemical and surface plasmon resonance studies. Langmuir, American Chemical Society, 2006, 22 (25), pp. 10716-10722. ⟨10.1021/la060793o⟩. ⟨hal-00333549⟩

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