【摘要】 使用溶胶-凝胶法制备并在900℃煅烧6 h获得了NiFe₂O₄粉体，用于制备敏感电极。采用流延技术制备了5YSZ膜和Al₂O₃膜，并在膜上分别丝网印刷了参比电极和加热电极，将它们叠层并在1 480℃烧结后，再印刷NiFe₂O₄敏感电极并在1 150℃烧结，最终获得了电势型NH₃传感器件。在11 V、13 V和15 V的加热电压下测试了器件的NH₃响应性能，响应性能在13 V和15 V时较稳定，NH₃敏感度分别为-47.24 mV/decade和-28.57 mV/decade。并在13 V加热电压下研究了器件对320×10^-6和200×10^-6 NH₃混入不同浓度NO₂后的响应信号，发现测试气氛中NH₃浓度较高时的抗NO₂信号干扰能力较强。还在此加热电压下研究了氧气浓度由10%变化到7%、4%和14%时器件对320×10^-6 NH₃的响应信号，发现氧气浓度低时的响应信号变化率较大。更多还原

【Abstract】 The NiFe₂O₄ powder was prepared by sol-gel method and calcined at 900 ℃ for 6 h, which was used to prepare the sensing electrode. The 5 YSZ film and Al₂O₃film were prepared by casting technology, and the reference electrode and heating electrode were screen printed on them respectively. After they were laminated and sintered at 1 480 ℃,the NiFe₂O₄-SE was printed and sintered at 1 150 ℃,the potentiometric ammonia sensor was finally obtained. The ammonia response performance of the device was tested under heating voltages of 11 V,13 V and 15 V. The device has good performance stability at 13 V and 15 V,and the ammonia sensitivity is-47.24 mV/decade and-28.57 mV/decade, respectively. And the response signal of the device to 320×10^-6 and 200×10^-6 of NH₃ mixed with different concentrations of NO₂ was studied under the heating voltage of 13 V,it was found that the anti-NO₂signal interference ability was stronger when the NH₃ concentration in the testing atmosphere was higher. The response signal of the device to 320×10^-6 NH₃ when the oxygen concentration changed from 10% to 7%,4%,and 14% was also studied under this heating voltage. It was found that the response signal change rate was great when the oxygen concentration was low.更多还原