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Author Zhang, Yong ♦ He, Jinping ♦ Yuan, Mengjiao ♦ Jiang, Bin ♦ Li, Peiwen ♦ Tong, Yexing ♦ Zheng, Xuejun
Source SpringerLink
Content type Text
Publisher Springer US
File Format PDF
Copyright Year ©2016
Language English
Subject Keyword Bi$_{3.25}$La$_{0.75}$Ti$_{3}$O$_{12}$ powders ♦ humidity sensing properties ♦ annealing temperature ♦ complex impedance plots ♦ Optical and Electronic Materials ♦ Characterization and Evaluation of Materials ♦ Electronics and Microelectronics, Instrumentation ♦ Solid State Physics
Abstract Bi$_{3.25}$La$_{0.75}$Ti$_{3}$O$_{12}$ (BLT) powders have been synthesized via the metal–organic decomposition method with annealing of the BLT precursor solution at 350°C, 450°C, 550°C, 650°C or 750°C. The crystalline structure and morphology of the BLT powders were characterized by x-ray diffraction analysis, field-emission scanning electron microscopy, energy-dispersive x-ray spectroscopy, and specific surface and pore size analyses. The humidity sensing properties of the BLT powders annealed at the five temperatures were investigated to determine the effect of annealing temperature. The annealing temperature strongly influenced the grain size, pore size distribution, and specific surface area of the BLT powders, being largely correlated to their humidity sensing properties. The specific surface area of the BLT powder annealed at 550°C was 68.2 m$^{2}$/g, much larger than for the other annealing temperatures, and the majority of the pores in the BLT powder annealed at 550°C were mesoporous, significantly increasing the adsorption efficiency of water vapor onto the surface of the material. The impedance of the BLT powder annealed at 550°C varied by more than five orders of magnitude over the whole humidity range at working frequency of 100 Hz, being approximately five times greater than for BLT powders annealed at other temperatures. The response time was about 8 s, with maximum hysteresis of around 3% relative humidity. The BLT powder annealed at 550°C exhibited the best humidity sensing properties compared with the other annealing temperatures. We expect that these results will offer useful guidelines for preparation of humidity sensing materials.
ISSN 03615235
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2016-08-18
Publisher Place New York
e-ISSN 1543186X
Journal Journal of Electronic Materials
Volume Number 46
Issue Number 1
Page Count 9
Starting Page 377
Ending Page 385

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Source: SpringerLink