Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 190, Issue -, Pages 305-310Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.08.048
Keywords
Humidity sensors; Bi-0.5(Na0.85K0.15)(0.5)Ti0.97Zr0.03O3; microspheres; Element substitution; Humidity sensing properties
Funding
- PCSIRT [IRT1080]
- NNSF of China [51272158]
- Hunan Provincial Natural Science Foundation of China [11JJ6058]
- Scientific Research Fund of Hunan Provincial Education Department [11C1199]
- Changjiang Scholar Incentive Program [(2009)17]
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Shanghai Nano Special Foundation [11nm0502600]
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Bi-0.5(Na0.85K0.15)(0.5)Ti0.97Zr0.03O3 (BNKTZ) sensing materials were successfully synthesized via a simple metal-organic decomposition method. Their morphological feature was characterized as regular shaped microspheres, and it was observed that a large quantity of nanoparticles with the size, of 50-100 nm were present on microspheres surfaces. The introduction of a small quantity of Zr4+ in, the reaction system was played an important role in the size-control. At room temperature, humidity, sensing properties of the BNKTZ were investigated in detail. At 100 Hz, the curve of impedance versus relative humidity (RH) was of good linearity and the variation of BNKTZ humidity sensor's impedance was more than four orders of magnitude when humidity changed from 11% to 95% RH. The response time and recovery time were found to be about 18 s and 60 s, respectively. Furthermore, the maximum, hysteresis was only 4% RH. Comparing with A site substituted materials, with the similar response and sensing range, the A and B sites co-substituted BNKTZ humidity sensor possessed lower impedance, better linearity and wider operating frequency. The results indicated that BNKTZ microspheres have broader application for fabricating high performance room temperature humidity sensors. (C) 2013 Elsevier B. V. All rights reserved.
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