含氟石墨烯涂层的倾斜光纤布拉格光栅用于氨检测

E. Grantzioti, N. Samartzis, K. Bhorkar, S. Pissadakis, S. Yannopoulos, M. Konstantaki
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引用次数: 0

摘要

我们描述了一种用于检测氨蒸气的光纤传感器,该传感器在倾斜的布拉格光栅上采用氟化石墨烯样覆盖层。利用激光介导的石墨烯(Gr)片的爆炸合成和转移(LEST),制备了掺杂F原子(~ 3.3 at)的少层涡轮层石墨烯片薄膜。%)沉积在光栅位置的光纤上。研究了传感器对NH4OH蒸气的响应,并在相同条件下监测了H2O的影响。在NH4OH蒸气压增加的情况下,不仅在包层模式中记录到了波长偏移,而且在基本布拉格模式中也记录到了波长偏移,这表明这种影响不仅仅是由于包层光学参数的变化。当达到蒸汽饱和时,监测到的波长位移最初是负的,变为正的。此外,与布拉格模式相比,高阶模式的监测位移的幅度有明显的差异,显示出2.5倍的高值。这项研究仍在进行中,还将包括用六种纳米粒子装饰纯的纳米级和纳米级的纳米级。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tilted optical fiber Bragg grating with fluorinated graphene-like overlayer for ammonia detection
We describe an optical fiber sensor for detection of ammonia vapors employing a fluorinated graphene-like overlayer on a tilted Bragg grating. Exploiting the laser-mediated explosive synthesis and transfer (LEST) of graphene (Gr) flakes a thin film of few-layer turbostratic graphene flakes doped with F atoms (~ 3.3 at. %) are deposited on the fiber at the location of the grating. The response of the sensor was investigated for NH4OH vapors while for reference, the effect of H2O was also monitored at identical conditions. Under increasing vapor pressure of NH4OH, wavelength shift is recorded not only in the cladding modes but also for the fundamental Bragg mode, indicating that the effect is not solely due to changes in the optical parameters of the overlayer. The monitored wavelength shift is initially negative turning to positive when vapor saturation is reached. Furthermore, there is a distinct difference in the magnitude of the monitored shifts with the higher order mode exhibiting 2.5x higher values compared to the Bragg mode. The study is ongoing and will also include overlayers of pure LEST Gr and LEST Gr decorated with Six nanoparticles.
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