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

767506

Sigma-Aldrich

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

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

460397

Sigma-Aldrich

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

IRMM531A

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

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

GF64001214

Titanium, tube, 500mm, outside diameter 10mm, inside diameter 8mm, wall thickness 1.0mm, annealed, 99.6+%

GF70333376

Titanium, wire reel, 10m, diameter 0.05mm, hard, 99.8%

GF92756852

Titanium, tube, 500mm, outside diameter 4.25mm, inside diameter 3.75mm, wall thickness 0.25mm, annealed, 99.6+%

GF66682288

Titanium, wire reel, 100m, diameter 0.5mm, as drawn, 99.6+%

GF78234521

Titanium, wire reel, 1m, diameter 0.25mm, annealed, 99.6+%

GF76735963

Titanium, wire reel, 10m, diameter 0.75mm, as drawn, 99.6+%

GF36846434

Titanium, wire reel, 100m, diameter 0.125mm, annealed, 99.6+%

GF86399106

Titanium, tube, 500mm, outside diameter 1.6mm, inside diameter 1.2mm, wall thickness 0.2mm, hard, 99.6+%

GF96944923

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

GF71724124

Titanium, tube, 500mm, outside diameter 12.7mm, inside diameter 10.9mm, wall thickness 0.9mm, annealed, 99.6+%

GF98748152

Titanium, wire reel, 1m, diameter 1.0mm, as drawn, 99.99+%

GF80932822

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

GF74389988

Titanium, wire reel, 0.5m, diameter 1.0mm, as drawn, 99.99+%

GF66180034

Titanium, tube, 500mm, outside diameter 1.05mm, inside diameter 0.75mm, wall thickness 0.15mm, annealed, 99.6+%

GF69773181

Titanium, wire reel, 100m, diameter 1.0mm, as drawn, 99.6+%

GF50402663

Titanium, tube, 500mm, outside diameter 6.1mm, inside diameter 5.1mm, wall thickness 0.5mm, annealed, 99.6+%

GF35683218

Titanium, microfoil, disks, 25mm, thinness 1.0μm, specific density 429μg/cm², permanent mylar 3.5μm support, 99.6+%

GF60092456

Titanium, tube, 1000mm, outside diameter 0.81mm, inside diameter 0.61mm, wall thickness 0.1mm, as drawn, 99.6+%

GF06003100

Titanium, tube, 100mm, outside diameter 9.5mm, inside diameter 8.2mm, wall thickness 0.65mm, annealed, 99.6+%

GF20610997

Titanium, tube, 1000mm, outside diameter 6.1mm, inside diameter 5.1mm, wall thickness 0.5mm, annealed, 99.6+%

GF99390134

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