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将硝酸铁和甲醇、磷酸溶液按一定比例混合后,通过旋涂法制备了磷酸铁(FePO4)纳米薄膜,测定了匀胶机转速对膜厚及烘干温度对膜厚和折射率的影响,并发现薄膜的烘干温度超过150℃时,薄膜的厚度(130nm)和折射率(1.7)变化不大。将该薄膜固定在钾离子交换玻璃光波导表面,研制出FePO4膜/K+交换玻璃复合光波导。酸碱指示剂溴百里酚兰(BTB)作为敏感试剂,固定在复合光波导表面,研制了BTB膜-FePO4膜/K+交换玻璃复合光波导氨气传感元件。采用自装的光波导气体传感检测系统对不同浓度的氨气进行了检测。结果表明,该传感元件能够检测0.35mg/m3浓度的氨气,并具有响应(10s)及恢复(90s)速度快、可逆性好、连续使用等特点。
After ferric nitrate and methanol and phosphoric acid solution were mixed in a certain proportion, the iron phosphate (FePO4) nanofilm was prepared by spin coating method, and the influence of spin speed on the film thickness and refractive index was measured. It was found that the film thickness (130nm) and refractive index (1.7) did not change much when the film drying temperature exceeded 150 ℃. The film was fixed on the surface of potassium ion exchange glass optical waveguide, developed a FePO4 film / K + exchange glass composite optical waveguide. The acid-base indicator bromothymol blue (BTB) as a sensitive reagent was fixed on the surface of the composite optical waveguide, and a BTB membrane-FePO4 membrane / K + exchange glass composite optical waveguide ammonia sensor was developed. A self-installed optical waveguide gas sensing system was used to detect ammonia in different concentrations. The results show that the sensing element can detect 0.35mg / m3 ammonia and has the characteristics of fast response (10s) and recovery (90s), good reversibility and continuous use.