Journal
ACS SENSORS
Volume 5, Issue 5, Pages 1345-1353Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b02586
Keywords
TiO2/(K,Na)NbO3; humidity sensor; impedance; hydrothermal method; nanocomposite
Funding
- National Natural Science Foundation of China [51872001, 51502001]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201803]
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Nanomaterials of TiO2, (K0.5Na0.5)NbO3, and the TiO2/(K0.5Na0.5)NbO3 nanocomposite were successfully synthesized by a hydrothermal method. Impedance-type humidity sensors were fabricated based on these materials. Our results reveal that the impedance of the TiO2/(K0.5Na0.5)NbO3 sensor changes by 5 orders of magnitude with an ultrahigh sensing response of S-f = 166 470 recorded at 100 Hz in the tested relative humidity (RH) range of 12-94%. This value is almost 2 and 4 orders of magnitude larger than that of the (K0.5Na0.5 )NbO3 and TiO2 sensors, respectively. Interestingly, satisfactory response/recovery time (25/38 s, within 5 min), very small hysteresis (<5%), excellent stability, and good repeatability were also achieved in the TiO2/(K0.5Na0.5 )NbO3 sensor. The improved sensing properties are ascribed to the synergistic effect of TiO2/(K0.5Na0.5 )NbO3 heterojunction, which contributes the impedance that is susceptible to environmental humidity. This work underscores that it is a facile way to boost humidity-sensing performance by constructing proper nanocomposites.
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