SiO_2@Fe_3O_4@C胶体纳米颗粒的制备及其光学性质

Preparation and Optical Properties of SiO_2@Fe_3O_4@C Colloidal Nanoparticles

制备了SiO_2@Fe_3O_4@C核壳结构颗粒,粒径可控,形貌均一.研究了在电场调控下,不同粒径,不同浓度的SiO_2@Fe_3O_4@C纳米颗粒悬浮液在不同溶剂下的光学性质,结果表明:150nm SiO_2@Fe_3O_4@C颗粒在质量分数10%浓度下得到的反射光谱可调节范围最宽,从735nm蓝移到540nm;随着颗粒悬浮液浓度的增加,反射光谱会整体蓝移.将粒径为150nm的粒子分散到不同的溶剂中,其电场响应性具有溶剂依赖性,溶剂折射率越大,反射波长越大.悬浮液的响应时间为150ms,当撤去电场后,悬浮液具有一定的回复性.

Highly dispersed SiO_2@Fe_3O_4@C core-shell nanoparticles with controllable particle sizes were prepared.Under electric field,the optical properties of SiO_2@Fe_3O_4 @C nanoparticle suspensions of different size,different concentrations,different the solvent was studied,and the results show that the reflection spectrum of 150 nm SiO_2@Fe_3O_4@C nanoparticles at a concentration of 10%（mass fraction）obtain the widest tunable range from 735 nm to 540 nm.With increasing concentration of nanoparticle suspension,the overall reflectance spectra blue shift.The solvent dependence of the electric fieldresponsive photonic crystals by dispersing 150 nm particles into different solvents was investigated,and the results show that the greater refractive index,the greater the reflection wavelength.The response time of the suspensions is 150 ms,and the suspensions have recovery after electric field disappeared.