水热合成法制备La_(0.7)Sr_(0.3)FeO_3纳米线的合成机理研究  

Formation and growth mechanism of La_(0.7)Sr_(0.3)FeO_3 nanowires by hydrothermal synthesis

作　　者：姚朋军[1,2] 王兢[1] 赵林[1,3] 戚金清[1] 苏梅英[1] 

机构地区：[1]大连理工大学电子科学与技术学院,辽宁大连116024 [2]沈阳师范大学教育技术学院,辽宁沈阳110034 [3]大连东软信息学院计算机科学与技术系,辽宁大连116024

出　　处：《功能材料》2012年第8期969-972,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(61176068;61001054;61131004)

摘　　要：在表面活性剂CTAB水溶液中添加硝酸盐溶液,并滴加氨水,采用水热合成法在180℃的温度下反应9h,制备了La0.7Sr0.3FeO3前驱体,在700℃下煅烧6h后得到La0.7Sr0.3FeO3纳米颗粒组装的纳米线。利用SEM、TEM和XRD对其形貌、尺寸和结构等进行了表征。制备的La0.7Sr0.3FeO3纳米线是由约为20nm的纳米颗粒组装而成的,纳米线的最大长径比达100以上。通过改变水热合成时间和前驱体的煅烧温度等实验条件,对La0.7Sr0.3FeO3纳米线的物相转化和生长机理进行了分析。表面活性剂CTAB作为生长控制剂和颗粒凝聚载体,能够控制材料沿着轴向生长,形成纳米线。La0. 7 Sr0. 3 FeO3 precursor was synthesized via a hydrothermal method with additive of CTAB in an autoclave at 180℃ for 9h. La0.7Sr0.3FeO3 nanoparticles assembled nanowires were obtained La0.7Sr0. 3FeO3 precur-sor at 700℃ for 6h. The morphology, size and structure were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The formation and growth mechanism of La0.7 Sr0. 3 FeO3 nanoparticles assembled nanowires was discussed. The results reveal that La0.7 Sr0. 3 FeO3 nanowires were assembled by 20 nm nanoparticles, which were several microns to tens of microns in length and 100 to 150 nm in diameter. The materials experienced a complicated process during the phase transformation. CTAB may be served as a growth controller and an agglomeration inhibitor to control the nanowires grow along the axial direction.

关 键 词：La0.7Sr0.3FeO3纳米线 水热合成法 CTAB 生长机理 

分 类 号：TB332[一般工业技术—材料科学与工程]