采用微波诱导低温固相反应法合成NiFe2O4纳米粉体,并通过浸渍法在其表面修饰Ag,通过X射线衍射分析(XRD)、扫描电镜(SEM)和X射线光电子能谱(XPS)研究修饰前、后粉体的结构及形貌,并对修饰不同含量Ag的旁热式气敏元件的气敏性能进行测试.结果表明:表面修饰的Ag为非晶态,能够有效阻止NiFe2O4纳米颗粒的团聚及长大,当表面修饰1.5％Ag后,NiFe2O4气敏元件的最佳工作电压为4.5 V,对丙酮气体具有较高的灵敏度,达到43,且响应(l s)和恢复(～l0 s)时间快,优于直接固相反应法掺杂1.5％Ag所得的NiFe2O4气敏元件的气敏性能.
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.
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