Gr/NiFe_2O_4纳米复合材料的制备与形成机理研究  

One-pot Hydrothermal Synthesis and Formation Mechanism of Gr/NiFe_2O_4 Nanocomposites

作　　者：贾海鹏 苏勋家[1] 侯根良[1] 毕松 郭锋 刘朝辉 程勇[1] 

机构地区：[1]第二炮兵工程大学,陕西西安710025

出　　处：《稀有金属材料与工程》2014年第10期2520-2524,共5页Rare Metal Materials and Engineering

摘　　要：以氧化石墨烯(GO)、Fe2(SO4)3和NiSO4为初始反应物,利用一步水热法合成了Gr/NiFe2O4纳米复合材料。采用X射线衍射(XRD)、透射电子显微镜(TEM)和拉曼光谱(RS)等分析手段对Gr/NiFe2O4样品进行了表征。结果表明:经过水热反应GO被还原的同时,纳米NiFe2O4成功地负载到石墨烯上,二者之间存在较强的界面相互作用,而且NiFe2O4纳米粒子增加了石墨烯片层间的距离避免了其再次堆垛,实现了石墨烯与NiFe2O4的良好复合。初步讨论了Gr/NiFe2O4纳米复合材料的形成机制,Ni2+、Fe3+在GO的含氧基团处非均相成核,在水热条件下不断长大,其生长过程遵循Ostwald熟化理论,即小尺寸的NiFe2O4粒子由于其较高的表面能而逐渐溶解,被那些尺寸较大的粒子消耗。Graphene/NiFe2O4（Gr/NiFe2O4） nanocomposites were synthesized using a facile one-pot hydrothermal method with graphene oxide（GO）,Fe2（SO4）3 and NiSO4 as starting materials.The as-prepared Gr/NiFe2O4 was characterized using X-ray diffraction（XRD）,transmission electron microscope（TEM）,and Raman spectra（RS）.The results indicate that GO is reduced to graphene and the well-dispersed NiFe2O4 nanoparticles are simultaneously deposited onto graphene sheets under the conditions generated by the hydrothermal system.There is a strong interface interaction between the graphene and NiFe2O4 nanoparticles,which avoids their aggregation.The formation mechanism of Gr/NiFe2O4 nanocomposites was discussed.The growth kinetics of NiFe2O4 nanoparticles follows the Ostwald ripening,in which smaller particles dissolve owing to their high surface energy and are essentially consumed by larger ones.

关 键 词：石墨烯 NiFe2O4纳米粒子 水热法 形成机理 

分 类 号：TB33[一般工业技术—材料科学与工程] TB383.1