摘要
利用 Sol-gel法结合氧化铝模板技术制备了 La0 .8Ca0 .2 Mn O3 纳米线 ,并研究了两种热处理方法对La0 .8Ca0 .2 Mn O3 纳米线结构和形貌的影响 .快速升温到 80 0℃得到的 La0 .8Ca0 .2 Mn O3 纳米线较粗 ,其直径大于氧化铝模板的孔径 ,而经过缓慢升温到 40 0℃预处理再升温到 80 0℃得到的 La0 .8Ca0 .2 Mn O3 纳米线 ,其直径和氧化铝模板的孔径相当 ,都约为 3 5 nm. X射线衍射和透射电镜分析结果表明 ,两种方法得到的La0 .8Ca0 .2 Mn O3 纳米线都是具有钙钛矿结构的属于单斜晶系的多晶材料 .
La 0.8Ca 0.2MnO 3 nanowires were prepared by using a simple sol-gel method with nano-channel {alumina(NCA)} as template. The effects of two kinds of annealing methods on the structure, morphology of La 0.8Ca 0.2MnO 3 nanowires were investigated. The diameter of La 0.8Ca 0.2MnO 3 nanowires prepared by ramping the furnace temperature directly to 800 ℃ with a rate of 10 ℃/min is larger than that of pores within NCA. While, the diameter of La 0.8Ca 0.2MnO 3 nanowires prepared by ramping the furnace temperature to 400 ℃ with a rate of 2 ℃/min and keeping at this temperature for 1 h, then ramping to 800 ℃ with a rate of 10 ℃/min and keeping at this temperature for 2 h is nearly equivalent to that of pores within NCA. XRD and selected area electron diffraction indicate that the nanowires derived under the two annealing conditions are of monoclinic perovskite structure. It is demonstrated that the La 0.8Ca 0.2MnO 3 nanowires with monoclinic perovskite structure can be fabricated at low temperatures by employing a solution route. The method presented in this paper is also feasible for fabricating the nanowires of other mono-component and multi-component oxides.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第10期1738-1741,共4页
Chemical Journal of Chinese Universities
基金
浙江省自然科学基金 (批准号 :60 10 92 )资助
