基于自组装膜的光纤错位型氨气传感器  

Optical fiber dislocation ammonia gas sensor based on self-assembled film

作　　者：朱琳 冯国英[1] 周昊[1] 罗韵[2] 王建军[2] Zhu Lin;Feng Guoying;Zhou Hao;Luo Yun;Wang Jianjun(Laser Micro-Nano Engineering Institute,College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China;Laser Fusion Research Center,CAEP,P.O.Box 919-988,Mianyang 621900,China)

机构地区：[1]四川大学电子信息学院激光微纳工程研究所,成都610065 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2021年第3期154-160,共7页High Power Laser and Particle Beams

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金项目(U1730141)。

摘　　要：演示了一种基于单壁碳纳米管(SWCNTs)-聚合物自组装复合膜的光纤错位型氨气传感器。通过层层自组装技术在高Q谐振器上涂覆薄膜,薄膜上存在大量的游离羧基以及较大的比表面积,这提供了光与薄膜之间的强相互作用,以及对氨气的高吸附性和选择性。光谱随氨气浓度影响的有效折射率而变化。在(10~37)×10^(-6)的低浓度范围内,光谱变化与氨气浓度差之比即灵敏度为13.25 pm/10^(-6),检测极限为3.77×10^(-6)并且具有良好的线性。这项工作研制为低浓度和高选择性氨气传感器提供了一种有效的方法。This paper presents the ammonia gas sensor of optical fiber dislocation type based on single-walled carbon nanotubes(SWCNTs)-polymer self-assembled composite film. Alone with high-Q resonator, the film has a large number of free carboxyl groups and a large specific surface area, which provides strong interaction between light and the film, as well as high adsorption and selectivity to ammonia. The spectrum from the sensor varies with the effective refractive index affected by the ammonia concentration. In the low concentration range of(10-37)×10^(-6), the ratio of the spectral change to the ammonia concentration difference(i.e. the sensitivity) is of 13.25 pm/10^(-6), a detection limit is 3.77×10^(-6) with good linearity. This work provides an effective method for developing lowconcentration and high-selectivity ammonia sensors.

关 键 词：光纤 错位熔接 氨气传感器 自组装薄膜 碳纳米管 

分 类 号：O436[机械工程—光学工程]