Characterization and humidity sensing properties of the sensor based on Na2Ti3O7 nanotubes.

Characterization and humidity sensing properties of the sensor based on Na2Ti3O7 nanotubes.

Journal of nanoscience and nanotechnology (2014-04-18)

Yupeng Zhang, Jian Wu, Ying Zhang, Wenbin Guo, Shenping Ruan

ABSTRACT

Na2Ti3O7 nanotubes was synthesized by a hydrothermal method, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Then the material was coated on Al2O3 ceramic substrate to fabricate humidity sensors using Ag-Pd as interdigitated electrodes. The sensor shows high humidity sensitivity and quick response-recovery time. The impedance changes about five orders of magnitude within humidity range from 11% to 95% relative humidity (RH). At the frequency of 100 Hz, the response time is 2 s and recovery time is 4 s, and the maximum hysteresis is less than 3% RH. Moreover, complex impedance property at different RH was investigated to study sensing mechanism. The results indicate the potential applications of Na2Ti3O7 nanotubes for fabricating high-performance humidity sensors.

MATERIALS

Product Number

Brand

Product Description

DENWAT3

Pure Water Density Standard, UKAS ISO/IEC17025 and ISO Guide 34 certified, density: 0.9982 g/mL at 20 °C, density: 0.9970 g/mL at 25 °C

DENWAT

Pure Water Density Standard, UKAS ISO/IEC17025 and ISO Guide 34 certified, density: 0.9982 g/mL at 20 °C, density: 0.9970 g/mL at 25 °C

GF24976525

Titanium, rod, 200mm, diameter 25mm, annealed, 99.6+%

38796

Sigma-Aldrich