Tang Xiling, Remmel Kurtis, Lan Xinwei, Deng Jiangdong, Xiao Hai, Dong Junhang
Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA.
Anal Chem. 2009 Sep 15;81(18):7844-8. doi: 10.1021/ac9012754.
Small size fiber optic devices integrated with chemically sensitive photonic materials are emerging as a new class of high-performance optical chemical sensor that have the potential to meet many analytical challenges in future clean energy systems and environmental management. Here, we report the integration of a proton conducting perovskite oxide thin film with a long-period fiber grating (LPFG) device for high-temperature in situ measurement of bulk hydrogen in fossil- and biomass-derived syngas. The perovskite-type Sr(Ce(0.8)Zr(0.1))Y(0.1)O(2.95) (SCZY) nanocrystalline thin film is coated on the 125 microm diameter LPFG by a facile polymeric precursor route. This fiber optic sensor (FOS) operates by monitoring the LPFG resonant wavelength (lambda(R)), which is a function of the refractive index of the perovskite oxide overcoat. At high temperature, the types and population of the ionic and electronic defects in the SCZY structure depend on the surrounding hydrogen partial pressure. Thus, varying the H(2) concentration changes the SCZY film refractive index and light absorbing characteristics that in turn shifts the lambda(R) of the LPFG. The SCZY-coated LPFG sensor has been demonstrated for bulk hydrogen measurement at 500 degrees C for its sensitivity, stability/reversibility, and H(2)-selectivity over other relevant small gases including CO, CH(4), CO(2), H(2)O, and H(2)S, etc.
与化学敏感光子材料集成的小型光纤设备正成为一类新型的高性能光学化学传感器，有望应对未来清洁能源系统和环境管理中的诸多分析挑战。在此，我们报告了一种将质子传导钙钛矿氧化物薄膜与长周期光纤光栅（LPFG）设备集成的方法，用于高温原位测量化石燃料和生物质衍生合成气中的大量氢气。通过简便的聚合物前驱体路线，将钙钛矿型Sr(Ce(0.8)Zr(0.1))Y(0.1)O(2.95)（SCZY）纳米晶薄膜涂覆在直径为125微米的LPFG上。这种光纤传感器（FOS）通过监测LPFG的共振波长（λ(R)）来工作，该波长是钙钛矿氧化物外涂层折射率的函数。在高温下，SCZY结构中离子和电子缺陷的类型和数量取决于周围的氢分压。因此，改变H(2)浓度会改变SCZY薄膜的折射率和光吸收特性，进而使LPFG的λ(R)发生偏移。已证明涂覆有SCZY的LPFG传感器在500℃下可用于大量氢气测量，具有灵敏度、稳定性/可逆性以及对包括CO、CH(4)、CO(2)、H(2)O和H(2)S等其他相关小气体的H(2)选择性。
