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

268496

Sigma-Aldrich

Titanium, powder, −100 mesh, 99.7% trace metals basis

433667

Sigma-Aldrich

Titanium, evaporation slug, diam. × L 6.3 mm × 6.3 mm, ≥99.99% trace metals basis

IRMM531A

Titanium, IRMM^®, certified reference material, 0.1 mm foil

460397

Sigma-Aldrich

Titanium, foil, thickness 0.127 mm, ≥99.99% trace metals basis

348805

Sigma-Aldrich

Titanium, foil, thickness 0.5 mm, 99.99% trace metals basis

267481

Sigma-Aldrich

Titanium, foil, thickness 0.25 mm, 99.99% trace metals basis

348864

Sigma-Aldrich

Titanium, wire, diam. 0.5 mm, 99.99% trace metals basis

366994

Sigma-Aldrich

Titanium, powder, <45 μm avg. part. size, 99.98% trace metals basis

767506

Sigma-Aldrich

Titanium, sputtering target, diam. × thickness 2.00 in. × 0.25 in., 99.995% trace metals basis

268526

Sigma-Aldrich

Titanium, sponge, 1-20 mm, 99.5% trace metals basis

267503

Sigma-Aldrich

Titanium, foil, thickness 0.25 mm, 99.7% trace metals basis

GF96944923

Titanium, wire reel, 5m, diameter 0.25mm, as drawn, 99.6+%

GF35446316

Titanium, rod, 100mm, diameter 20mm, annealed, 99.6+%

GF21200746

Titanium, tube, 100mm, outside diameter 0.81mm, inside diameter 0.61mm, wall thickness 0.1mm, as drawn, 99.6+%

GF99390134

Titanium, rod, 100mm, diameter 3.0mm, annealed, 99.6+%

GF73866998

Titanium, tube, 100mm, outside diameter 12.7mm, inside diameter 10.9mm, wall thickness 0.9mm, annealed, 99.6+%

GF39390880

Titanium, tube, 200mm, outside diameter 6.35mm, inside diameter 4.57mm, wall thickness 0.89mm, annealed, 99.6+%

GF29374005

Titanium, mesh, 100x100mm, nominal aperture 4.3mm, wire diameter 1.5mm, 4.4x4.4 wires/inch, open area 94%, platinized diamond mesh

GF75709457

Titanium, sphere, 100pcs, diameter 3mm, 99.6+%

GF35682600

Titanium, tube, 200mm, outside diameter 6.1mm, inside diameter 5.1mm, wall thickness 0.5mm, annealed, 99.6+%

GF83238127

Titanium, tube, 100mm, outside diameter 3.0mm, inside diameter 1.5mm, wall thickness 0.75mm, annealed, 99.6+%

GF73915128

Titanium, tube, 100mm, outside diameter 6.35mm, inside diameter 4.57mm, wall thickness 0.89mm, annealed, 99.6+%

GF82391878

Titanium, rod, 50mm, diameter 8.0mm, as drawn, 99.99+%

GF33373795

Titanium, tube, 200mm, outside diameter 12.7mm, inside diameter 10.9mm, wall thickness 0.9mm, annealed, 99.6+%

GF35130035

Titanium, rod, 25mm, diameter 9.5mm, annealed, 99.99+%

GF63527003

Titanium, tube, 200mm, outside diameter 9.5mm, inside diameter 8.2mm, wall thickness 0.65mm, annealed, 99.6+%

GF17395375

Titanium, tube, 1000mm, outside diameter 2.03mm, inside diameter 1.63mm, wall thickness 0.2mm, annealed, 99.6+%

GF58790964

Titanium, rod, 1000mm, diameter 2mm, as drawn, 99.99+%

GF40509345

Titanium, rod, 100mm, diameter 8.0mm, as drawn, 99.99+%

GF82579843

Titanium, microfoil, disks, 25mm, thinness 0.1μm, specific density 42.8μg/cm², permanent mylar 3.5μm support, 99.6+%