Li Bangquan, Sun Qian, Fan Hongsheng, Cheng Ming, Shan Aixian, Cui Yimin, Wang Rongming
Department of Physics, Beihang University, Beijing 100191, China.
Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China.
Nanomaterials (Basel). 2018 Jan 15;8(1):41. doi: 10.3390/nano8010041.
A series of α-Fe₂O₃ nanocrystals (NCs) with fascinating morphologies, such as hollow nanoolives, nanotubes, nanospindles, and nanoplates, were prepared through a simple template-free hydrothermal synthesis process. The results showed that the morphologies could be easily controlled by SO₄ and H₂PO₄. Physical property analysis showed that the α-Fe₂O₃ NCs exhibited shape- and size-dependent ferromagnetic and optical behaviors. The absorption band peak of the α-Fe₂O₃ NCs could be tuned from 320 to 610 nm. Furthermore, when applied as electrode material for supercapacitor, the hollow olive-structure exhibited the highest capacitance (285.9 F·g) and an excellent long-term cycling stability (93% after 3000 cycles), indicating that it could serve as a candidate electrode material for a supercapacitor.
通过简单的无模板水热合成工艺制备了一系列具有迷人形态的α-Fe₂O₃纳米晶体（NCs），如空心纳米橄榄、纳米管、纳米纺锤体和纳米片。结果表明，形态可以通过SO₄和H₂PO₄轻松控制。物理性质分析表明，α-Fe₂O₃ NCs表现出形状和尺寸依赖性的铁磁和光学行为。α-Fe₂O₃ NCs的吸收带峰值可从320调至610 nm。此外，当用作超级电容器的电极材料时，空心橄榄结构表现出最高的电容（285.9 F·g）和出色的长期循环稳定性（3000次循环后为93%），表明它可作为超级电容器的候选电极材料。
