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利用水热法合成出LiFePO4和钇(Y)掺杂的LiFePO4粉体,并作为敏感试剂,用浸渍-提拉法固定在锡掺杂玻璃光波导表面,分别研制了LiFePO4和LiFe0.99Y0.01PO4薄膜/锡掺杂玻璃光波导传感元件。用这些薄膜传感元件对挥发性有机气体进行检测,并比较了它们的气敏特性。结果表明,掺杂Y后LiFePO4薄膜具有良好的荧光特性,同时透光率增大,还具有较高的气敏性。LiFe0.99Y0.01PO4薄膜/锡掺杂玻璃光波导传感元件对二甲苯气体有较好的选择性响应,其检测响应范围为1×10-3～1×10-7(V/V)。当气体浓度小于1×10-6时,其它苯类气体对二甲苯气体检测不会产生干扰。该传感元件具有灵敏度高、响应快、再现性高等优点。
LiFePO4 and yttrium (Li) -doped LiFePO4 powders were synthesized by hydrothermal method and used as sensitive reagents. The LiFePO4 and LiFe0.99Y0.01PO4 powders were respectively prepared by immersion-pulling method on the surface of tin-doped glass optical waveguide. Thin film / tin-doped glass optical waveguide sensor. Volatile organic gases were detected using these thin-film sensing elements and their gas-sensing properties were compared. The results show that the LiFePO4 thin films have good fluorescence characteristics after Y doping, meanwhile the transmittance increases and the gas sensitivity is also high. LiFe0.99Y0.01PO4 thin film / tin-doped glass optical waveguide sensor has a good selectivity of xylene gas response, the detection response range of 1 × 10-3 ~ 1 × 10-7 (V / V). When the gas concentration is less than 1 × 10-6, other benzene gas p-xylene gas detection will not interfere. The sensor has the advantages of high sensitivity, fast response and high reproducibility.