Electrical and sensing properties of a flexible humidity sensor made of polyamidoamine dendrimer-Au nanoparticles
- 作者：Pi-Guey Su ; spg@faculty.pccu.edu.tw ; spg@ulive.pccu.edu.tw ; [Author Vitae] ; Chuen-Chi Shiu ; [Author Vitae]
- 关键词：Flexible ; Humidity sensor ; G1-NH2-AuNPs ; Impedance analysis ; Sensing properties
- 刊名：Sensors and Actuators B ; Chemical
- 出版年：2012
- 期刊代码：161_09254005
- 类别：et
- 出版时间：April, 2012
- 卷：165
- 期：1
- 页码：151-156
- 文件大小：662 K
摘要
Generation 1 amine terminated polyamidoamine (PAMAM) dendrimer (G1-NH2)-Au nanoparticles (G1-NH2-AuNPs) was coated on a polyester (PET) substrate to form a novel flexible impedance-type humidity sensor. The formation of AuNPs was characterized by UV-vis spectroscopy. The microstructure of the G1-NH2-AuNPs film was analyzed by atomic force microscope (AFM). The effect of the AuNPs on the electrical and humidity sensing properties of the G1-NH2-AuNPs films on a PET substrate was investigated. The sensor had good flexibility. This flexible humidity sensor also exhibited good sensitivity and acceptable linearity (Y = 鈭?.045X + 7.866; R2 = 0.9693) between logarithmic impedance (log Z) and RH in the range 30-90%RH, negligible hysteresis (within 2%RH), good response time (40 s) and recovery time (50 s), and long-term stability (39 days at least), measured at 1 V, 1 kHz and 25 掳C. The flexible humidity sensor's linearity depended on the applied frequency. The temperature influence between 15 and 35 掳C; found to be 鈭?.55%RH/掳C for 30-90%RH. The different complex impedance plots obtained at low and high relative humidity indicated that the ions dominate the conductance of the G1-NH2-AuNPs film.