Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 162, Issue 1, Pages 229-236Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.12.072
Keywords
Ferrite; Ceramic; Gas sensor; Sol gel
Funding
- DIT
- NPMASS-ADA, Govt of India
- CSIR, Govt of India
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The gas sensing performances of the ferrite based sensors can be improved by modifying their surfaces to volume ratio, grain size, morphology and meso-porous nature. Synthesis of phase pure ferrites with desired micro-structural features at lower calcinations temperature remains a challenging task. In order to improve their gas sensing performance, in the present work we have investigated the (synthesis) process induced modifications of the phase and micro-structural features of wet chemical synthesized ferrite sensing elements. We have synthesized Mg0.5Zn0.5Fe2O4 (MZFO) particles through poly vinyl alcohol assisted wet chemical synthesis route (MZFO-P) and citrate based modified Pechini process (MZFO-C). The phase formation behavior, micro-structural characteristics and surface area estimation of the particles are performed using X-ray diffraction, electron microscopy and N-2 adsorption-desorption isotherm analyses respectively. It is demonstrated that as compared to MZFO-P. MZFO-C nano-particles are phase pure with smaller particle size, larger specific surface area, and meso-porous surface morphologies. These structural and micro-structural features are found to have significant influence on the gas sensing performances of Mg0.5Zn0.5Fe2O4 particles prepared using two different wet chemical routes. (C) 2011 Elsevier B.V. All rights reserved.
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