氧化镍-铁酸锌复合薄膜/锡掺杂玻璃光波导传感元件的制备及其对硫化氢气体的气敏性

用溶胶-凝胶法制成了NiO掺杂的ZnFe2O4溶胶，并用浸渍提拉法将其固定在锡掺杂玻璃光波导表面，研制了NiO-ZnFe2O4复合薄膜/锡掺杂玻璃光波导气敏元件，并对无机有毒气体进行了检测。 实验结果表明，在室温下，该传感元件对H2S气体具有一定的选择性响应，而对相同浓度的其它无机气体的响应相对较小，能够检测到1.0×10-9（体积比）的H2S气体，其响应和恢复时间分别是6和8 s。 该元件具有灵敏度高、响应-恢复快、可逆性和重复性好、容易制备，在室温下便于操作等特点。

Preparation of Nickel Oxide-Zinc Ferrite Composite Thin Film/Tin-diffused Glass Optical Waveguide Sensor and Its Gas-sensing for Hydrogen Sulfide

NiO doped ZnFe2O4 sol synthesized by a sol-gel method was dip-coated on a tin-doped glass optical waveguide to fabricate a sensor used for the detection of poisonous gases. The results show that the as-prepared composite film has a good selectivity toward H2S over other gases with the same concentration. The detection limit of H2S is 1.0×10-9(volume ratio) and the corresponding response and recovery time are 6 s and 8 s, respectively. The advantages of sensor encompass easy fabrication, room temperature operation, high sensitivity, fast response and recovery speed, good reversibility and repeatability.