【摘要】 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。更多还原

【Abstract】 The α-Fe2O3 nano-wires were grown on 99% pure iron substrates by thermal oxidation in air.The impacts of growth conditions,including the oxidation temperature and time,on its microstructures and emission properties were evaluated.The nano-wires were characterized with X-ray diffraction,and scanning electron microscopy.The results show that the oxidation temperature and time strongly affect the microstructures and emission characteristics of the nano-wires.For instance,at 600℃,the(110) and(300) preferentially oriented nano-wire were obtained.For a short oxidation time,the nano-flakes dominated;and as the time increased,the nano-wires gradually showed up,growing in number and in length.The aspect ratio and density of the nano-wire,grown at 400℃ for 4 h,were found to be optimal for field emission,with an on-set field of 2.3 V/m and a fairly uniform and stable emission.更多还原