Yang L, Saavedra S S, Armstrong N R
Department of Chemistry, University of Arizona, Tucson, Arizona 85721.
Anal Chem. 1996 Jun 1;68(11):1834-41. doi: 10.1021/ac960033q.
A novel sensor for gaseous iodine has been developed using a combination of sol-gel processing and planar integrated optical waveguiding technologies. The sensing principle is based on the detection of a charge transfer complex formed between iodine and phenyl groups that have been incorporated into a porous, methylated glass film. The glass film was prepared from siloxane precursors by the sol-gel method. Sensors were fabricated by coating the film over a single-mode planar waveguide. Light was coupled into and out of the laminate structure using integral grating couplers, and formation of the charge transfer complex was monitored as attenuated total reflection of the guided wave. The sensor exhibits a linear response to I(2) in the range of 100 ppb to 15 ppm with response and recovery times less than 15 s. The response is selective to 4 ppm iodine in the presence of 10 ppm chlorine and is stable for at least 3 months.
一种新型气态碘传感器已通过溶胶-凝胶工艺和平面集成光波导技术相结合的方式研制成功。传感原理基于检测碘与已掺入多孔甲基化玻璃膜中的苯基之间形成的电荷转移络合物。玻璃膜由硅氧烷前驱体通过溶胶-凝胶法制备而成。传感器通过在单模平面波导上涂覆该膜来制造。使用集成光栅耦合器将光耦合进层压结构并从层压结构中耦合出，通过监测导波的衰减全反射来监测电荷转移络合物的形成。该传感器对100 ppb至15 ppm范围内的I₂呈现线性响应，响应和恢复时间均小于15秒。在存在10 ppm氯的情况下，该响应对4 ppm碘具有选择性，并且至少稳定3个月。
