Development of a durable fiber-optic oxygen sensor for harsh underground environments.
Development of a durable fiber-optic oxygen sensor for harsh underground environments.
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DOI：
10.1016/j.talanta.2010.07.027
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发表时间：
2010-09
期刊：
影响因子：
6.1
通讯作者：
Y. Koshiba;Yuki Nakamura;D. Ito;Takashi Yokoyama;S. Okazaki;H. Nakagawa;Takashi Arai
中科院分区：
文献类型：
--
作者：
Y. Koshiba;Yuki Nakamura;D. Ito;Takashi Yokoyama;S. Okazaki;H. Nakagawa;Takashi Arai
为了研制一种在井下恶劣环境下具有长期稳定性和耐久性的光纤氧传感器，本文重点研究了硅树脂保护的效果。钌（II）配合物被用作氧敏感化合物。采用旋涂法制备了有机硅树脂与钌配合物的均匀复合膜。通过暴露于热水（80°C）进行复合膜和Ru络合物膜之间的溶解氧（DO）灵敏度的比较。加速老化实验结果表明，钌配合物膜的灵敏度稳定，而复合膜的灵敏度在短时间内随曝光时间的延长而增加。为了提高钌配合物的稳定性，制备了有机硅树脂包覆的钌配合物薄膜。通过热水和模拟地下水的暴露，研究了钌络合物膜上有和没有硅树脂涂层的饱和溶解氧（8.5ppm）的灵敏度差异。这些结果表明，与未涂覆膜相比，涂覆膜的灵敏度和响应时间分别稳定和缓慢。然后，通过暴露于100 vol.%氧气实验表明：（1）响应时间受外涂层厚度的显著影响;和（2）外涂层的光电二极管的响应速度与未外涂层的光电二极管的响应速度相比慢约35倍。我们的结论是，涂层是有效的，在恶劣环境中的中长期氧气监测的应用。
This paper focuses on effects of protection with a silicone resin to develop a fiber-optic oxygen sensor with long-term stability and durability in harsh underground environments. Ruthenium (II) complexes were used as oxygen-sensing compounds. A uniform composite film composed of silicone resin and the Ru complex was prepared with spin coating technique. A comparison of dissolved-oxygen (DO) sensitivity between the composite film and a Ru complex film was made by exposing to hot water (80°C). The result of the accelerated degradation test showed that sensitivity of the Ru complex film was stable; meanwhile that of the composite film increased with exposure time in a short period. In order to improve stability, the Ru complex film overcoated with silicone resin was prepared. Differences in sensitivity for saturated DO (8.5ppm) between with and without the silicone resin overcoating on the Ru complex film were investigated by exposing to the hot water and simulated underground water. These results revealed that the sensitivities and response times of the overcoated films were stable and slow, respectively, compared to those of non-overcoated films. Then, optodes were evaluated for effects of the overcoating on sensing properties by exposing to 100vol.% oxygen gas. The experiment showed that: (1) the response time was significantly influenced by the thickness of the overcoating; and (2) response speed of the overcoated optode was slow by a factor of about 35 compared to that of the non-overcoated. We concluded that the overcoating was effective in the application to mid- and long-term oxygen monitoring in the harsh environments.