络合剂/表面活性剂对溶剂热法制备钴纳米花的影响  

Effect of complexing agents/surfactants on flowery Co microcrystals prepared by solvothermal method

作　　者：李浩[1] 张喜斌[1] 

机构地区：[1]惠州学院化学工程系,广东惠州516007

出　　处：《无机盐工业》2010年第6期30-32,35,共4页Inorganic Chemicals Industry

基　　金：惠州学院博士科研启动基金(C509.0204);广东省高等学校人才引进项目(A.309.0210)

摘　　要：以氯化钴为钴源,在络合剂乙二胺四乙酸二钠(EDTA)存在的条件下,采用溶剂热法制备出六方密堆积晶型、形貌新颖的钴纳米花微晶。用扫描电镜(SEM)、X射线能谱仪(EDS)、X射线衍射仪(XRD)对样品进行了表征,分析了络合剂和表面活性剂对产物形貌的影响。结果表明:每个钴纳米花微晶由众多厚度为200 nm的钴纳米板沿中心呈辐射状展开形成;EDTA络合剂对钴纳米花的形成起到了至关重要的作用,而表面活性剂则不会显著影响产物的形貌。机理探讨表明:在EDTA的结构导向作用下,钴晶核生长成为具有板状结构的微晶;在空间位阻、板状微晶之间磁力的共同作用之下,钴板呈发散状排列方式,最终形成钴纳米花微晶。Hexagonal close-packed phase Co microcrystals with novel flowery morphology were prepared by solvothermal method,in which cobalt chloride was used as Co source and disodium ethylene diamine tetraacetate （ EDTA ） as complexing agent. The product were characterized by SEM, EDS, and XRD. In addition, effects of complexing agents and surfactants on morphology of the products were investigated. Results showed every flowery Co microcrystal was composed of many pieces of Co plate with uniform thickness of about 200 nm, which exhibited radiating arrangement from the centre. It was also found that EDTA played a crucial role in determining flowery structure of the sample. However, surfactants had no pronounced effects on morphology of the products. Based on the observations, mechanism of formation of flowery Co microcrystals was proposed. With action of EDTA, Co crystal nucleus grew into Co nanoplates at first ; Co nanoplates diffused and assembled together as a result of strong magnetic interaction and steric hindrance, thus leading to the formation of flowery Co microcrystals.

关 键 词：钴纳米花 络合剂 表面活性剂 溶剂热法 

分 类 号：TQ138.12[化学工程—无机化工]