Synthesis of α-Fe₂O₃ nanobelts and nanoflakes by thermal oxidation and study to their magnetic properties

详细信息    查看全文

• 作者：Xinghua Su^a ; Chengshou Yu^b ; Chengwen Qiang^b ; ^c ; ^{qiangchw04@gmail.com"" rel=""nofollow}
• 关键词：Hematite ; Nanobelts ; Nanoflakes ; Magnetic property
• 刊名：Applied Surface Science
• 出版年：2011
• 出版时间：15 August 2011
• 年：2011
• 卷：257
• 期：21
• 页码：9014-9018
• 全文大小：1043 K

文摘

α-Fe₂O₃ nanobelts and nanoflakes have been successfully synthesized by oxidation of iron-coated ITO glass in air. The X-ray diffraction, Raman spectrum and scanning electron microscopy are carried out to characterize the nanobelts and nanoflakes. The formation mechanism has been presented. Significantly, the magnetic investigations show that the magnetic properties are strongly shape-dependent. The magnetization measurements of belt-like and flake-like α-Fe₂O₃ in perpendicular exhibit ferromagnetic feature with the coercivity (H_c) and saturation magnetization (M_s) of 334.5 Oe and 1.35 emu/g, 239.5 Oe and 0.12 emu/g, respectively. For the parallel, belt-like and flake-like α-Fe₂O₃ also exhibit ferromagnetic feature with the H_c and M_s of 205.5 Oe and 1.44 emu/g, 159.6 Oe and 0.15 emu/g, respectively.