Abstract:

Sodium titanate （Na₂Ti₃O₇） nanowires were synthesized via a simple hydrothermal method. The properties of the humidity sensor based on sodium titanate nanowires were characterized. Both the response time and the recovery time are short, around 5 s and 6 s, respectively. A great change of the impedance (about five orders of magnitude) was observed at 20 Hz when the relative humidity (RH) varied from 11％ to 95％. The curve of impedance vs RH at 20 Hz shows a good linearity. 

Key words: nanowires, titanate, humidity sensor, impedance