本研究製備2,5-二甲基-1-苯基-1H-吡咯(簡稱為化合物1)，1-(4-氨基苯基)-2,5-二甲基-1H-吡咯(簡稱為化合物2)，1-(4-硝基苯基)-2,5-二甲基-1H- 吡咯( 簡稱為化合物3) 以及金奈米粒子( 簡稱為AuNPs)/1-(4-硝基苯基)-2,5-二甲基-1H-吡咯(化合物3)複合材料，並於氧化鋁基板上製成薄膜檢測其濕度感測特性。
探討所製備化合物的苯環上取代基類型以及取代基位置對於電學和濕度感測性質的影響。對於濕度感測特性而言，化合物3 會比化合物1 具有較高的靈敏度，但在低濕的情況下，化合物3 比化合物1有較高的電阻。並以AuNPs/化合物3 複合材料探討添加AuNPs 對於電學和濕度感測性質的影響，而以AuNPs/化合物3 複合薄膜感測濕度而言，其具有良好的線性，良好的濕滯現象，靈敏性高，反應時間和回復時間短，以及良好的長期穩定。
同時利用阻抗頻譜分析圖探討AuNPs/化合物3 複合薄膜的濕度傳導機制，並由阻抗頻譜分析圖可得知其在低濕狀態下為電子傳導機制，而在高濕狀態下由離子傳導為主。
Novel impedance-type humidity sensors were fabricated by coating
2,5-dimethyl-1-phenyl-1H-pyrrole (1),
1-(4-aminophenyl)-2,5-dimethyl-1H-pyrrole (2),
1-(4-nitrophenyl)-2,5-dimethyl-1H-pyrrole (3)
and gold nanoparticles/compound 3 (AuNPs/compound 3) nanocomposite films on alumina and plastic substrates. Compound 1, compound 2, compound 3 and AuNPs/compound 3 nanocomposite films were analyzed using atomic force microscopy (AFM) and UV-Vis spectroscopy. The effects of the substituents on the benzene ring of compound 1 on the electrical and humidity-sensing properties of the compound 1 film were studied. The humidity sensor that was fabricated with the compound 3 exhibited high sensitivity but a higher resistance at low humidity than that which was made of the compound 1. The effects of the AuNPs on the electrical and humidity sensing properties of the AuNPs/compound 3 nanocomposite film on a PET substrate were investigated. The sensor that was made of the AuNPs/compound 3 nanocomposite film exhibited high sensitivity, good linearity, small hysteresis, high flexibility, a short response/recovery time, a weak dependence on temperature and high long-term stability. The linearity of the humidity sensor depended on the applied frequency. The sensing mechanism of the AuNPs/compound 3 film was elucidated with reference to impedance plots.
