Preparation and gas sensing properties for acetone of amorphous Ag modified NiFe₂O₄ sensor

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• 作者：Wan-li JIAO ; ^{jiaowanli1977@163.com} ; Lei ZHANG
• 关键词：nickel ferrite ; low temperature solid state reaction ; dipping method ; silver ; acetone
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：May, 2012
• 卷：22
• 期：5
• 页码：1127-1132
• 文件大小：435 K

摘要

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 (鈭?0 s) are the main characteristics of this sensor.