中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2012年
5期
1127-1132
,共6页
镍铁氧体%低温固相反应%浸渍法%银%丙酮
鎳鐵氧體%低溫固相反應%浸漬法%銀%丙酮
얼철양체%저온고상반응%침지법%은%병동
nickel ferrite%low temperature solid state reaction%dipping method%silver%acetone
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.
採用微波誘導低溫固相反應法閤成NiFe2O4納米粉體,併通過浸漬法在其錶麵脩飾Ag,通過X射線衍射分析(XRD)、掃描電鏡(SEM)和X射線光電子能譜(XPS)研究脩飾前、後粉體的結構及形貌,併對脩飾不同含量Ag的徬熱式氣敏元件的氣敏性能進行測試.結果錶明:錶麵脩飾的Ag為非晶態,能夠有效阻止NiFe2O4納米顆粒的糰聚及長大,噹錶麵脩飾1.5％Ag後,NiFe2O4氣敏元件的最佳工作電壓為4.5 V,對丙酮氣體具有較高的靈敏度,達到43,且響應(l s)和恢複(～l0 s)時間快,優于直接固相反應法摻雜1.5％Ag所得的NiFe2O4氣敏元件的氣敏性能.
채용미파유도저온고상반응법합성NiFe2O4납미분체,병통과침지법재기표면수식Ag,통과X사선연사분석(XRD)、소묘전경(SEM)화X사선광전자능보(XPS)연구수식전、후분체적결구급형모,병대수식불동함량Ag적방열식기민원건적기민성능진행측시.결과표명:표면수식적Ag위비정태,능구유효조지NiFe2O4납미과립적단취급장대,당표면수식1.5％Ag후,NiFe2O4기민원건적최가공작전압위4.5 V,대병동기체구유교고적령민도,체도43,차향응(l s)화회복(～l0 s)시간쾌,우우직접고상반응법참잡1.5％Ag소득적NiFe2O4기민원건적기민성능.
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.
