title: Characterization and humidity sensing properties of the sensor based on Na2Ti3O7 nanotubes.
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.
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.forename: Wenbin
authors.initials: W
authors.lastname: Guo
authors.forename: Shenping
authors.initials: S
authors.lastname: Ruan
mesh_terms: D003217:Conductometry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006813:Humidity; D036103:Nanotechnology / Q000295:instrumentation*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D014025:Titanium / Q000737:chemistry*; D014159:Transducers; D014867:Water / Q000032:analysis* / Q000737:chemistry
chemical_list: D010087:Oxides; D014867:Water; C471701:sodium titanate; D014025:Titanium