Flexibility and electrical and humidity-sensing properties of N-substituted pyrrole derivatives and composite films of Au nanoparticles/N-substituted pyrrole derivatives

作者：Su Pi Guey^*; Chiu Sih Ru; LinDepartment Yu Te

来源：Sensors and Actuators B: Chemical , 2016, 224: 833-840.

DOI：10.1016/j.snb.2015.10.077

• Humidity sensor
• N-substituted pyrrole derivatives
• Gold nanoparticles
• Composite

Novel impedance-type humidity sensors were fabricated by coating 2,5-dimethy1-1-phenyl-1H-pyrrole (1), 1-(4-aminopheny1)-2,5-dimethy1-1H-pyrrole (2), 1-(4-nitropheny1)-2,5-dimethy1-1H-pyrrole (3) and gold nanoparticles/compound 3 (AuNPs/compound 3) composite films on alumina and plastic substrates. Compound 1, compound 2, compound 3 and AuNPs/compound 3 composite 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 I. The effects of the AuNPs on the electrical and humidity sensing properties of the AuNPs/compound 3 composite film on a PET substrate were investigated. The sensor that was made of the AuNPs/compound 3 composite 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 composite film was elucidated with reference to impedance plots.

• 出版日期2016-3-1