Preparation and characterization of Gd3+ substituted nano-structured cobalt ferrites for humidity sensor

被引：0

作者：

Rana, Anu ^{[1
]}

Thakur, O.P. ^{[1
]}

Kumar, Vinod ^{[2
]}

Pant, R.P. ^{[3
]}

Singh, Bhikham ^{[3
]}

机构：

[1] School of Applied Sciences, Netaji Subhas Institute of Technology, New Delhi

[2] DCR University of Science and Technology, Murthal, Haryana

[3] National Physical Laboratory, New Delhi

来源：

Sensor Letters | 2014年 / 12卷 / 09期

关键词：

Co-Gd ferrites; Humidity; Nano-particles; Sensors; X-ray diffraction;

D O I：

10.1166/sl.2014.3290

中图分类号：

学科分类号：

摘要：

Magnetic nano-materials CoGdxFe2-xO4, (x = 0.0, 0.1, 0.3 and 0.5) were synthesized by chemical co-precipitation method. Spinel ferrite crystalline phase formation of the developed materials was confirmed by the peak positions in X-ray diffraction pattern. The developed particles were annealed at 573 K to improve their crystalline properties. The crystallite size was calculated by Debye Scherrer's formula. The average crystallite size was found to be 7 nm in the Gd3+ substituted sample (with x = 0.5) compared to 27 nm in the case of the un-substituted cobalt ferrite sample. The developed nano-particle pallets have been studied for conductivity based humidity sensors at room temperature in the humidity range of 10% RH to 80% RH. The results of our investigations reveal a strong dependence of the material electrical conductivity on the humidity and the Gd3+ concentration. The humidity sensitivity coefficient has been calculated in terms of relative change in resistance of material with humidity and it was found that among all developed nano-structured ferrite materials CoGd0.5Fe1.5O4 ferrite exhibits the highest sensitivity towards humidity with an exponential increase in electrical conductivity of more than thousand times as the humidity increases from 10% RH to 80% RH. Copyright © 2014 American Scientific Publishers All rights reserved.

引用

页码：1378 / 1382

页数：4

共 42 条

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