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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

Sigma-Aldrich

Water, Deionized

Sigma-Aldrich

Water, ACS reagent

Sigma-Aldrich

Water, suitable for HPLC

Sigma-Aldrich

Water, HPLC Plus

Titanium, wire reel, 0.5m, diameter 1.0mm, annealed, 99.6+%

Titanium, tube, 500mm, outside diameter 0.51mm, inside diameter 0.35mm, wall thickness 0.08mm, annealed, 99.6+%

Titanium, tube, 500mm, outside diameter 3.0mm, inside diameter 1.5mm, wall thickness 0.75mm, annealed, 99.6+%

Titanium, tube, 500mm, outside diameter 0.81mm, inside diameter 0.61mm, wall thickness 0.1mm, as drawn, 99.6+%

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

Titanium, wire reel, 1m, diameter 0.25mm, as drawn, 99.99+%

Titanium, wire reel, 1m, diameter 0.5mm, as drawn, 99.6+%

Titanium, wire reel, 10m, diameter 0.125mm, annealed, 99.6+%

Titanium, wire reel, 1m, diameter 0.5mm, as drawn, 99.99+%

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

Titanium, wire reel, 20m, diameter 1.5mm, as drawn, 99.6+%

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

Titanium, wire reel, 1m, diameter 1.5mm, as drawn, 99.6+%

Titanium, wire reel, 10m, diameter 1.5mm, as drawn, 99.6+%

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

Titanium, wire reel, 500m, diameter 0.20mm, annealed, 99.6+%

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

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

Titanium, wire reel, 50m, diameter 0.75mm, as drawn, 99.6+%

Titanium, rod, 1000mm, diameter 3.0mm, annealed, 99.6+%

Titanium, mesh, 100x100mm, nominal aperture 0.19mm, wire diameter 0.23mm, 60x60 wires/inch, open area 20%, twill weave

Titanium, rod, 200mm, diameter 16mm, annealed, 99.6+%

Titanium, rod, 100mm, diameter 2mm, annealed, 99.6+%

Titanium, microfoil, disks, 25mm, thinness 0.5μm, specific density 225.4μg/cm², permanent mylar 3.5μm support, 99.6+%

Titanium, rod, 100mm, diameter 9.5mm, annealed, 99.99+%

Titanium, rod, 100mm, diameter 2mm, as drawn, 99.99+%