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以FeSO4.7H2O,H3PO4,LiOH.H2O,AgNO3及Y(NO3)3.6H2O为原料,利用水热法一步合成出了LiFe1-0.01xY0.005xAg0.005xPO4粉体(x=0.5,1.0),并将该材料作为敏感试剂,用旋转-甩涂法做成纳米薄膜固定在锡掺杂玻璃光波导表面,在不同温度下进行热处理。采用紫外-可见分光光度计、测厚仪以及自组装的玻璃光波导气敏测试仪研究了热处理对LiFe1-0.01xY0.005xAg0.005xPO4薄膜光学及气敏特性的影响。研究结果表明:在450℃下进行热处理的薄膜元件具有良好的光学透明及较好的气敏特性。相同浓度的不同挥发性有机气体中,该传感元件对二甲苯气体有很好的选择性响应,其检测响应范围为1×10-7～1×10-3(V/V),响应-恢复时间分别小于5和100 s。
LiFe1-0.01xY0.005xAg0.005xPO4 powders (x = 0.5, 1.0) were synthesized by hydrothermal method using FeSO4.7H2O, H3PO4, LiOH.H2O, AgNO3 and Y (NO3) 3.6H2O as raw materials, The material as a sensitive reagent, spin - spin coating method made of nano-film fixed on the surface of tin-doped glass optical waveguide, at different temperatures for heat treatment. The effects of heat treatment on the optical and gas sensing properties of LiFe1-0.01xY0.005xAg0.005xPO4 thin films were investigated by UV-visible spectrophotometer, thickness gauge and self-assembled glass waveguide gas sensors. The results show that the thin film elements heat-treated at 450 ℃ have good optical transparency and good gas-sensing properties. The same concentration of different volatile organic gases, the sensing element of xylene gas has a very good selective response, the detection response range of 1 × 10-7 ~ 1 × 10-3 (V / V), the response - Recovery time is less than 5 and 100 s respectively.