Zhuang Lin, Zhang Wei, Zhao Yongxin, Shen Hui, Lin Han, Liang Jinhua
State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Photovoltaics Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Sci Rep. 2015 Mar 23;5:9320. doi: 10.1038/srep09320.
Novel-morphological Fe3O4 nanosheets with magnetochromatic property have been prepared by a modified solvothermal method. Such nanosheets could form one-dimension photonic crystal under an external magnetic field. The Fe3O4 nanosheets suspension could strongly diffract visible light and display varied colors with changing the intensity of the magnetic field. The photonic response is rapid, fully reversible and widely tunable in the entire visible spectrum. Excellent magnetic properties of these Fe3O4 nanosheets are exhibited with a high saturation magnetization (82.1 emu/g), low remanence (13.85 emu/g) and low coercive force (75.95 Oe). The amount of the solvent diethylene glycol (DEG) plays a key role in the formation of the sheet-shaped morphology. When the ratio of the DEG reaches 100%, the growing of the crystal plane (111) of Fe3O4 is inhibited and the sheet-like Fe3O4 crystals are formed.
通过改进的溶剂热法制备了具有磁致变色特性的新型形态的Fe3O4纳米片。这种纳米片在外部磁场下可以形成一维光子晶体。Fe3O4纳米片悬浮液能够强烈衍射可见光，并随着磁场强度的变化呈现出不同的颜色。光子响应迅速、完全可逆，并且在整个可见光谱范围内具有广泛的可调性。这些Fe3O4纳米片具有优异的磁性能，饱和磁化强度高（82.1 emu/g），剩磁低（13.85 emu/g），矫顽力低（75.95 Oe）。溶剂二甘醇（DEG）的用量在片状形态的形成中起关键作用。当DEG的比例达到100%时，Fe3O4晶面（111）的生长受到抑制，形成片状Fe3O4晶体。
