磁响应Fe₃O₄/PVP/SiO₂胶体光子晶体的制备及光学性质  

Synthesis and Optical Properties of Magnetically Responsive Fe3O4/PVP/SiO2 Colloidal Photonic Crystals

作　　者：韩平[1] 陈昌浩[1] 霍晓莉 张文莹[1] 蒋文凤 卢学刚[1] 梁工英[1] 

机构地区：[1]西安交通大学理学院,物质非平衡合成与调控教育部重点实验室,陕西西安 [2]中石油东部管道有限公司甘陕管理处,陕西西安

出　　处：《应用物理》2016年第4期54-62,共9页Applied Physics

基　　金：国家自然科学基金项目(No. 51172178)资助。

摘　　要：磁响应胶体光子晶体因其具有光子带隙可调、制备简便、响应速度快等特点,在彩色显示、光开关等领域有着重要的应用前景。本文首先采用溶剂热法制备出了Fe3O4/PVP胶体粒子,并利用正硅酸乙酯(TEOS)水解对其表面进行SiO2包覆,得到表面携带负电荷的Fe3O4/PVP/SiO2复合纳米胶体粒子。SEM和TEM测试结果表明,Fe3O4/PVP/SiO2具有单分散特征,平均粒径约为100 nm。VSM测试结果表明,胶体粒子具有超顺磁性,其饱和磁化强度约为26 emu/g。经进一步回流处理后,胶体粒子表面表现明显的负电荷属性,Zeta电势为?48.3 mV。所合成的Fe3O4/PVP/SiO2胶体粒子可在乙腈中均匀分散,所形成的胶体溶液在外加磁场的作用下表现出明亮的结构色,具有明显的磁场可调谐光子带隙特征。Magnetic responsive colloidal photonic crystals have great potential to be used in color display, light swich etc. due to their performance of tunable photonic band-gap, fast response and easy preparation. In this paper, a solvothermal method was used to prepare Fe3O4/PVP colloidal particles and the particles were then coated with SiO2by TEOS hydrolysis to form Fe3O4/PVP/SiO2 composite particles. SEM and TEM results show that as-prepared Fe3O4/PVP/SiO2 particles possess monodisperse characteristics and the mean particle size is about 100 nm. VSM results show that Fe3O4/PVP/SiO2 particles have superparamagnetism and the saturation magnetization Ms is about 26 emu/g. After refluxing treatment in water, the surface of Fe3O4/PVP/SiO2 particles is negatively charged and the Zeta potential is ?48.3 mv. As-prepared Fe3O4/PVP/SiO2 particles can be easily dispersed in acetonitrile to form stable suspensions. Under the magnetic field, the Fe3O4/PVP/SiO2 suspension in acetonitrile displays bright structural color and tunable band-gap features.

关 键 词：胶体光子晶体 磁响应 结构色 光学性质 超顺磁性 

分 类 号：TB3[一般工业技术—材料科学与工程]