Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220123.doi: 10.7503/cjcu20220123

• Article: Inorganic Chemistry • Previous Articles     Next Articles

Dynamic Amorphous Photonic Structure Patterns Assembled by Hexagonal Magnetic Nanosheets

LI Lin1, QI Fenglian1,2, QIU Lili1, MENG Zihui1()   

  1. 1.School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 100081,China
    2.CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China
  • Received:2022-03-01 Online:2022-08-10 Published:2022-04-22
  • Contact: MENG Zihui E-mail:mengzh@bit.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22102039)

Abstract:

Hexagonal Fe2O3 nanosheets were firstly prepared by a high-temperature solvothermal method. Then, a modified St?ber method was employed to coat Fe2O3 nanosheet with a SiO2 shell, following with a gas-phase reduction method for the preparation of the monodisperse hexagonal Fe@SiO2 nanosheet(FeNSs). The obtained FeNS with the total side thickness of 220 nm and the total diagonal length of 400 nm has the advantages of uniform sizes, good dispersity and anisotropy. Notably, the FeNS was ferromagnetic with the saturation magnetization of 25.7 A·m2·kg-1. Serving as building blocks, FeNSs assembled to a novel amorphous photonic structure(APS) under the synergistic effect of the magnetically induced force, evaporation-induced capillary force and mechanical force. By tuning the angle of magnetic fields from 0° to 80°and 90°(relative to the plane of substrates), the chromatic APS patterns with red, green and purple was obtained, respectively. From the characterization of SEM and FFT, it is demonstrated that the assembly of APS is mainly attributed to the magnetically induced control of the long axis of FeNSs. Additionally, by using the dependence of the structural color of APS on the magnetic field orientation, various APS patterns with dynamic structural colors were also obtained.

Key words: Amorphous photonic structure, Magnetic nanosheet, Self-assembly, Iron

CLC Number: 

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