Développement de capteurs à fibre optique basés sur la résonance ...

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Article 1 Submitted to Thin Solid films 0.7 E C a 0.6 I- Experiment +0< + + + c,< List of coated layers: 1: Ag film 0.5 X 0.4 E EU. C z 0.2 01 + + 1.36 + + 1.37 a o 1,36 >< 1.39 X 0 -25 -20 -15 -10 -5 0 5 10 Incident Angle (Dey.) 20 25 Fig.7(1) Measurements in the solutions with the refractive indices of 1.36, 1.37, 1.38 and 1.39 respectively for the sensor before the deposition of Zr02 C 0.9 '' .' Experí ment I" List of coated layers: 1: Ag film 0.7 -, \ 2: Zr02 film 0.5 ',. e* o + -t-> * + o * -t-> * >Ø+4>«< 'on"+ + < ;ç-
Article i Submitted to Thin Solid films 3.4. Experimental studies on reliability Unfortunately, the performances of this sensor deteriorated in a few days while exposed to air. The evolution was characterized in figure 8 by measuring the SPR responses in aqueous solutions with definite refractive indices of 1.33, 1.345, 1.350, 1.355 respectively on the 2' and 12th days. It's obvious that the overlay of Zr02 was not dense enough to protect the silver from oxidation. Therefore, the acid thiols with both long chain (11 Mercaptoundecanoic acid, synthesized at IBCP-CNRS Lyon) and short chain (Mercaptoacetic acid, Sigma product) were introduced to further experiments. Prior to the elaboration of the Zr02 layer, the metallized fibers were dipped into the thiol solutions at i0 M concentration for 2 hours in order to constitute a self-assembled monolayer (SAM) of thiol on the silver surface. The experimental results demonstrate that the thiol can ameliorate the lifetime of the sensor as well as its mechanical strength. Moreover, the sensor using the long chain acid thiol is much more stable than that using short chain one. This phenomenon can be explained as that the long chain thiol is able to build a monolayer much denser than the short chain thiol. The evolutions shown in figure 9 for an experimental sensor with long chain acid thiol, which is conserved in air and measured in pure water on the 4th 21st 40th and 70th days respectively, demonstrate that this sensor can keep its function reliable for about three weeks. A remarkable improvement, from some days to some weeks for the lifetime of the SPR sensor using silver, demonstrates the value of this work. This chemical treatment to the silver surface using a thiol SAM can be applied to other SPR devices such as the traditional prism-based systems while silver is used. 17
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Développement de capteurs à fibre optique basés sur la résonance ...

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