人工活性膜模板制备铅钡铬酸盐纳米棒及其光学性能

Controlled Synthesis and Photics Properties of Nanorods of PbCrO_4 and BaCrO_4 with Artificial Active Membrane as Template

利用胶棉人工活性膜模板与乙二胺的协同作用,成功制备了铬酸铅、铬酸钡纳米棒.前者直径范围为28～55nm,最大长径比为25,结构为单斜单晶;后者直径范围为24～38nm,最大长径比为28,结构为正交单晶.产物相对于其体材料而言,红外光谱峰值仅有少量蓝移,而紫外-可见光谱最大吸收峰则分别“蓝移”了30nm和35nm,荧光发射峰也分别蓝移了9nm和15nm,这均是纳米材料量子尺寸效应的体现.还对产物的形成机理作了初步探讨.

Nanorods of lead chromate and barium chromate were synthesized by using a rtificial active mem-brane of celloidin as template and th e cooperating effect of artificial active membrane with ethylenediamin e.The results indicated that the diameter of lead chromate nanorods is between28～55nm and the largest ratio of leng th to diameter is 25,the nanorod exhibi ted a monoclinic single crystal stru cture.The diameter of barium chroma te nanorods is between 24～38nm and the l argest ratio of length to diameter is28.The rod had an orthorhombic single crystal structure.The products have optical properties which are different from those of bulk materials:the IR absorption peaks have slightly bl ue-shift,the fluorescent emission peaks have 9nm and 15nm blue-shift re-spectively compared to those of the b ulk materials,and the UV-Vis spectr a showed that the obvious absorption peaks respectively blue-shifted 30nm and 35nm compared to bulk that of ma terials as a result of quantum size effect.The synthesis mechanism of t he products was discussed primarily.