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采用溶胶凝胶法制备掺杂量不同的ZnO-Fe3O4溶胶,并用浸渍-提拉法将敏感材料涂覆在K+交换玻璃光波导表面,研制出ZnO-Fe3O4复合薄膜/K+交换玻璃光波导敏感元件。将敏感元件固定在光波导监测系统对挥发性有机气体进行检测。实验结果表明,在室温下该敏感元件对二甲苯蒸气有较好的选择性响应,能检测的二甲苯最低浓度为1×10-6(体积比V/V0),响应及回复时间为12s和60s。该敏感元件具有响应快,灵敏度高,成本低,容易制备等特点。
ZnO-Fe3O4 sols with different doping amount were prepared by sol-gel method, and the sensitive materials were coated on the surface of K + exchange glass optical waveguide by dipping-pulling method to fabricate ZnO-Fe3O4 composite film / K + exchange glass optical waveguide sensor . The sensor is fixed in the optical waveguide monitoring system to detect volatile organic gases. The experimental results show that the sensor has a good selective response to xylene vapor at room temperature. The lowest concentration of xylene that can be detected is 1 × 10-6 (volume ratio V / V0), the response and recovery time is 12s and 60s. The sensitive components with fast response, high sensitivity, low cost, easy preparation and so on.