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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

Supelco

Water, for TOC analysis

Supelco

Water, suitable for ion chromatography

Sigma-Aldrich

Water, BioPerformance Certified

Supelco

Density Standard 998 kg/m³, H&D Fitzgerald Ltd. Quality

Sigma-Aldrich

Titanium, wire, diam. 1.0 mm, 99.99% trace metals basis

Titanium, wire reel, 25m, diameter 1.0mm, annealed, 99.6+%

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Titanium, wire reel, 200m, diameter 0.20mm, annealed, 99.6+%

Titanium, wire reel, 25m, diameter 0.25mm, annealed, 99.6+%

Titanium, wire, straight, 1000mm, diameter 1.0mm, as drawn, 99.6+%

Titanium, wire reel, 25m, diameter 0.25mm, as drawn, 99.6+%

Titanium, wire reel, 5m, diameter 0.5mm, as drawn, 99.6+%

Titanium, wire reel, 200m, diameter 0.25mm, annealed, 99.6+%

Titanium, wire reel, 25m, diameter 0.20mm, annealed, 99.6+%

Titanium, wire reel, 5m, diameter 0.75mm, as drawn, 99.6+%

Titanium, wire reel, 25m, diameter 1.0mm, as drawn, 99.6+%

Titanium, wire reel, 20m, diameter 0.125mm, annealed, 99.6+%

Titanium, wire reel, 2m, diameter 1.0mm, as drawn, 99.99+%

Titanium, wire reel, 200m, diameter 0.125mm, annealed, 99.6+%

Titanium, wire reel, 200m, diameter 0.25mm, as drawn, 99.6+%

Titanium, wire reel, 5m, diameter 0.20mm, annealed, 99.6+%

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Titanium, wire reel, 5m, diameter 0.25mm, as drawn, 99.99+%

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