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通过改变分散稳定剂聚乙烯吡咯烷酮(PVP)的浓度并借助多元醇水热还原法制备了不同壳层厚度的Fe3O4@PVP胶体纳米粒子。研究了壳层厚度对Fe3O4@PVP胶体粒子构筑的磁响应光子晶体(MRPCs)光学性能的影响规律,构建了反射强度高、变色范围宽的磁响应光子晶体。研究结果表明:随着PVP浓度的增加,合成的Fe3O4@PVP胶体粒子的单分散性变好,壳层PVP含量增加、厚度增大,PVP在粒子表面的吸附构象由平铺型向尾型转变;构筑的光子晶体反射光谱强度增加,带隙调控范围变宽。这说明单分散磁性胶体粒子壳层聚合物为尾型吸附构象时,有利于构筑出高性能的基于空间位阻效应的磁响应光子晶体。
Fe3O4 @ PVP colloidal nanoparticles with different shell thickness were prepared by changing the concentration of polyvinylpyrrolidone (PVP) as dispersion stabilizer and hydrothermally reducing polyol. The influence of shell thickness on the optical properties of magnetically responsive photonic crystals (MRPCs) constructed by Fe3O4 @ PVP colloidal particles was studied. A magnetically responsive photonic crystal with high reflection intensity and a wide range of discoloration was constructed. The results show that with the increase of PVP concentration, monodispersity of synthesized Fe3O4 @ PVP colloidal particles becomes better, the content of PVP in the shell increases and the thickness increases, and the adsorption conformation of PVP on the particle surface changes from tiled to tail type The intensity of the photon crystal was increased and the band gap was broadened. This shows that monodisperse magnetic colloidal particle shell polymer tail-type adsorption conformation, is conducive to the construction of high-performance steric effect based on the magnetoresistance photonic crystal.