Journal
RSC ADVANCES
Volume 5, Issue 29, Pages 22879-22883Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra00451a
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Funding
- National Natural Science Foundation of China [61370046, 61274068]
- Project of Science and Technology Development Plan of Jilin Province [20140204056GX, 20130206021GX]
- Project of Science and Technology plan of Changchun City [14G020, 14KG019]
- Postdoctoral Sustentation Fund of Jilin Province, China [RB201371]
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SrTiO3 nanospheres were synthesized by a hydrothermal method and characterized by X-ray diffraction and scanning electron microscopy. Then, the material was coated on an Al2O3 ceramic substrate to fabricate humidity sensors using Ag-Pd interdigitated electrodes. The sensor shows high humidity sensitivity and fast response and recovery. The impedance changes by four orders of magnitude over a relative humidity (RH) range from 11% to 95%. At the frequency of 100 Hz, response and recovery times are both 2 s, and the maximum hysteresis is <1% RH. In addition, the complex impedance at different RH was investigated to understand the sensing mechanism. The results indicate potential applications of SrTiO3 for fabricating high-performance humidity sensors.
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