Nitric oxide sensing properties of a surface acoustic wave sensor with copper-ion-doped polyaniline/tungsten oxide nanocomposite film

作者：Wang Shih Han; Shen Chi Yen^*; Lien Zhi Jie; Wang Jing Huei

来源：Sensors and Actuators B: Chemical , 2017, 243: 1075-1082.

DOI：10.1016/j.snb.2016.12.101

• Surface acoustic wave
• Copper-ion-doped polyaniline/tungsten oxide nanocomposite
• Nitric oxide
• Frequency shift
• Gas sensor

Copper-ion-doped (Cu2+) PANI/WO3 films with various Cu2+ concentrations were coated onto surface acoustic wave resonators to function as room temperature nitric oxide sensors. Morphological characterization and functionalization of the sensing material were explored using scanning electron microscopy and Fourier transform infrared spectroscopy, respectively. The optimal film was discovered to be a 0.2 wt% Cu2+/PANI/WO3 film. The sensor response toward the detection of 1 ppb NO at room temperature in dry air was 165 Hz and presented a signal-to-noise ratio of approximately 37. The response and recovery times were 59 and 17 s when detecting 80 ppb NO, respectively. The frequency response was discovered to be linear in the NO concentration range 1-116 ppb. The sensor's sensitivity, reversibility, repeatability, selectivity, and stability were studied for ppb-level NO gas sensing at room temperature in dry air.

• 出版日期2017-5