Abstract
Surface plasmon resonance (SPR) is a powerful technique for direct sensitive (bio) chemical detection. This phenomenon can be used to measure the refractive index of either bulk chemical samples or chemically sensing thin layers. In this work, a surface plasmon resonance fibre optic sensor has been developed. A 50 nm thick silver film is deposited by thermal evaporation onto the silica core of the optical fibre. To protect silver from oxidation, the evaporated silver film was covered with self-assembled monolayers (SAMs) of long-chain alkanethiols (1-octadecanethiol). To characterize these SAMs, silver films evaporated onto macroscopic glass surface as test samples and several techniques such as contact-angle measurements (sessile drop method), X-ray photoelectron spectroscopy, and atomic force microscopy were used. Such a modified surface showed a high contact angle with water which remains stable after a one month stay in aqueous media. Similarly, a SPR fibre optic sensor showed no ageing problem, when kept in the same conditions.
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