Xia Binyun, Liu Bonan, Wang Ning, Liao Changrui, Long Gang, Zhao Chao, Liao Zhaolong, Lyu Dajuan
National Engineering Research Center of Fiber Optic Sensing Technology and Networks, Wuhan University of Technology, Wuhan 430070, China.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
ACS Appl Mater Interfaces. 2022 Sep 14;14(36):41379-41388. doi: 10.1021/acsami.2c08228. Epub 2022 Sep 5.
Optical fiber humidity sensors have sparked enormous interests in many fields because of their excellent features. However, it remains a great challenge to balance sensitivity, humidity response, temperature crosstalk, and wet hysteresis for real-world application. To overcome this trade-off, an optical fiber humidity sensor is developed here by coating functional graphene oxide (GO)/polyelectrolyte nanocomposite film on the excessively tilted fiber grating (ex-TFG), in which GO/polyelectrolyte nanocomposite film is employed for enhancing the hydrophilicity and accelerating the adsorption/desorption of water molecule, while the ex-TFG is utilized for improving the sensitivity of refractive index and eliminating the crosstalk of temperature. By this design, optical fiber humidity sensors achieve high sensitivity, rapid response and recovery, low hysteresis, and temperature crosstalk as well as excellent repeatability and stability in large relative humidity (RH) range. Our work provides a promising platform for effective RH monitoring systems that can be widely applied in rapid diagnostics, pharmacy, precision medicine, and so forth.
光纤湿度传感器因其优异的特性在许多领域引发了极大的兴趣。然而，对于实际应用而言，要在灵敏度、湿度响应、温度串扰和湿滞之间取得平衡仍然是一个巨大的挑战。为了克服这种权衡，本文通过在过度倾斜光纤光栅（ex-TFG）上涂覆功能化氧化石墨烯（GO）/聚电解质纳米复合膜来开发一种光纤湿度传感器，其中GO/聚电解质纳米复合膜用于增强亲水性并加速水分子的吸附/解吸，而ex-TFG用于提高折射率灵敏度并消除温度串扰。通过这种设计，光纤湿度传感器在较大的相对湿度（RH）范围内实现了高灵敏度、快速响应和恢复、低滞后、温度串扰以及出色的重复性和稳定性。我们的工作为有效的RH监测系统提供了一个有前景的平台，该系统可广泛应用于快速诊断、制药、精准医学等领域。
