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Room temperature detection of chemical pollutants by SnO2-based optical fiber sensors

机译：基于SnO2的光纤传感器的化学污染物室温检测

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In the last decade a huge number of SnO2-based gas sensors have been proposed for environmental monitoring, automotive applications, air conditioning in houses, airplane and aircrafts. However, most of the proposed sensors work at very high temperatures in order to reach high sensitivities. Here, a SnO2-based optical fiber sensor is proposed for the room temperature detection of chemical pollutants in air. Particles layers composed by tin dioxide grains, with wavelength and subwavelength dimensions, resulted very promising because they are able to significantly modify the optical near field profile emerging from the film surface due to local enhancements of the evanescent wave contribute, and thus to improve the sensitivity to surface effects induced by the analyte interaction. The room temperature sensing performances of SnO2-based particles layers towards environmental pollutants have been investigated by the exposure to different concentrations of toluene and xylene vapors as well as gaseous ammonia. They have also been compared with the performances obtained with other optical fiber sensors in the same configuration, but coated with different sensitive materials, such as Single-Walled carbon nanotubes. The preliminary results obtained evidenced the surprising capability of the SnO2-based optical sensor to detect chemical pollutants at ppm level in air at room temperature. Finally, preliminary results on the effects of the processing parameters and post processing thermal annealing on film morphology and optical near field are presented.
机译：在过去的十年中，已经提出了大量的SnO2的气体传感器用于环境监测，汽车应用，房屋，飞机和飞机的空调。然而，大多数提议的传感器在非常高的温度下工作，以达到高敏感性。这里，提出了一种基于SnO2的光纤传感器，用于室温检测空气中的化学污染物。由二氧化锡颗粒构成的颗粒层，具有波长和亚波长尺寸，导致由于缺陷波的局部增强而能够显着地改变从薄膜表面出现的光学近场曲线，因此提高灵敏度通过分析物相互作用诱导的表面效应。通过暴露于不同浓度的甲苯和二甲苯蒸气以及气态氨来研究SnO2基颗粒层对环境污染物的较为基于环境污染物的室温感测性能。它们也与以相同配置的其他光纤传感器获得的性能相比，但涂有不同的敏感材料，例如单壁碳纳米管。获得的初步结果证明了基于SnO2的光学传感器的令人惊讶的能力，以在室温下检测PPM水平的化学污染物。最后，提出了对加工参数和后处理热退火对薄膜形态和光学近场的影响的初步结果。

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