溶剂热法合成粒径可控的Fe3O4磁性介孔／空心球

摘要

采用简便的溶剂热法合成粒径可控的Fe3O4磁性介孔／空心球（mesoporous／hollowspheresofmagne．tite，MHSM），粒径从80nm至400nm可调，通过调节反应时间、NH4HCO3与NH4Ac的摩尔比来控制MHSM的形貌、粒径以及介孔一空心的程度．采用XRD、SEM、TEM、VSM多种表征手段对MHSM进行了表征，结果表明NH4HCO3和NH4Ac的摩尔比对MHSM结构的形成、形貌、粒径起关键性的作用；NH4＋的浓度对MHSM的粒径和磁性有决定性的影响；保持NH4HCO3和NH4Ac的摩尔比不变，延长反应时间对MHSM的结构与空腔生长有一定的影响。%A facile solvothermal approach is proposed to produce mesoporous/ hollow spheres of magnetite (MHSM) with controllable size ranging from 80 nm to 400 nm. The size, morphology and structure of the final MHSM are achieved by simple adjustment of the molar ratio of ammonium bicarbonate ( NH4 HCO3 ) and ammonium acetate (NH4Ac) ,ammonium ion concentration and the reaction time. The characterizations of XRD, SEM ,TEM and VSM showed that the ratio of NH4HCO3 and NH4Ac strongly influenced on the morphology and size of MHSM. Particularly, the molar concentration of ammonium was vital for size and magnetism modulation of MHSM. Under a fixed concentration of ammonium and a fixed ratio of NH4HCO3 and NHaAc, prolonging reaction time influenced on the mesoporous structure and interior space of MHSM.