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采用空气热氧化法在铁基片上原位生长纳米α-Fe2O3,并通过扫描电镜、X射线衍射、场发射等对600℃下氧化不同时间所制得样品的形貌、结构、场发射性能进行表征和分析。研究表明,600℃下所得样品均为(110)和(300)取向的α-Fe2O3,而且氧化时间对纳米α-Fe2O3的形状、密度、长径比及场发射性能都有较大的影响。生长开始时,主要以α-Fe2O3纳米片状为主,随着氧化时间的增加,纳米线逐渐增多,长度变长。其中氧化4 h所得样品的密度和长径比适中,场发射效果最好,其开启场强为2.3 V/μm,而且概念错误均匀性好。
Nanocrystalline α-Fe2O3 was grown in situ on an iron substrate by air thermal oxidation method. The morphology, structure and field emission properties of the prepared samples were characterized by scanning electron microscopy, X-ray diffraction, field emission and so on at different oxidation times at 600 ℃ Characterization and analysis. The results show that all the samples obtained at 600 ℃ are (110) and (300) -oriented α-Fe2O3, and the oxidation time has great influence on the shape, density, aspect ratio and field emission properties of nano-α-Fe2O3. At the beginning of growth, the main α-Fe2O3 nanosheet-shaped, with the increase of oxidation time, nanowires gradually increased, the length becomes longer. Among them, the density and aspect ratio of the samples obtained after oxidation for 4 h were moderate, and the field emission effect was the best. The on-field intensity was 2.3 V / μm, and the concept error uniformity was good.