ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 22    No. 5    May 2012

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Preparation and gas sensing properties for acetone of amorphous Ag modified NiFe2O4 sensor
JIAO Wan-li, ZHANG Lei
(School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, China)
Abstract: Nickel ferrite nano-powders were prepared by microwave radiating low-temperature solid-state reaction method, and then modified with Ag by dipping method. The crystal structure and morphology of the samples were characterized by means of X-ray diffraction(XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The gas sensing properties of the samples were also investigated. The results reveal that the Ag, as amorphous structure, can efficiently prevent the reuniting and growing-up of nanosized NiFe2O4 grains, and 1.5% Ag modified NiFe2O4 sensor has a better sensitivity, up to 43, for acetone gas than 1.5%Ag mixed NiFe2O4 sensor prepared by low-temperature solid-state reaction, at an optimal working voltage of 4.5 V. The quick response time (1 s) and fast recovery time (~10 s) are the main characteristics of this sensor.
Key words: nickel ferrite; low temperature solid state reaction; dipping method; silver; acetone
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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