以溶胶-凝胶法制备了SnO2纳米粒子,以原位聚合沉积法在陶瓷基底叉指金电极上制备了PANI及PANI/SnO2复合薄膜,形成气敏元件。室温下测试了元件对氨气及水果释放气体的敏感特性。结果表明,PANI和PANI/SnO2复合膜对氨气具有选择性好,线性度好的特点,PANI比PANI/SnO2复合膜的灵敏度高,更适合在较宽浓度范围内测试氨气；另外,这两种传感器对存放的水果(香蕉、苹果)释放气体具有响应恢复快,重复性好等特性,PANI/SnO2复合膜对水果释放的气体比PANI具备更高的灵敏度,有望在水果仓储运输方面得以应用。%SnO2 nanoparticles were synthesized via sol-gel method. PANI and PANI/SnO2 composite film were coated on ceramic substrate interdigital gold electrodes by in-situ polymerization deposition method to form gas sensors. The gas sensing properties of sensors to ammonia and fruit releasing gases were tested at room temperature. The results show that two gas sensors both have good selectivity and linearity on ammonia,and PANI has higher sen-sitivity than PANI/SnO2 , so PANI is more suitable for testing ammonia in a wide range of concentrations;In addition,two sensors both have good response on gases released by the stored fruits(bananas,apples)with short response and recovery time,good repeatability and other characteristics. PANI/SnO2 composite membrane has higher sensitivity than PANI,which expected to be applied in fruit storage and transport.
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