一维棒状氧化铋的控制合成与生长机制

以Bi(NO3)3·5H2O为原料,NaOH为沉淀剂,DESB(十二烷基乙氧基磺基甜菜碱)为控制剂,采用一步水相沉淀法,在温和条件下(70℃)制备了直径约为4μm、长度为几十微米的棒状一维氧化铋.通过X射线衍射(XRD)、扫描电镜(SEM)、能量色散X射线(EDX)对其晶体结构、相组成、微观形貌及可能的生长机制进行了表征和分析.结果表明,所得两端呈尖角的棒状结构为高纯度的单斜相氧化铋,并且具有较好的结晶度.根据实验结果,推测定向附着(oriented attachment)与奥斯特瓦尔德熟化(Ostwald ripening)共同作用为其可能的生长机制.

Controlled fabrication and growth mechanism of 1D rod-like bismuth oxide

1D rod-like Bi2 O3 was synthesized by precipitating bismuth nitrate with sodium hydroxide under a mild one-step aqueous process in the presence of DESB （dodecyl ethoxy sulfobetaine） .The rod-like Bi2 O3 have better distribution with an average diameter of 4μm and length of up to tens of micrometers .X-ray diffraction and energy-dispersive X-ray analysis （EDX） indicate that rod-like Bi2 O3 with sharp end is monoclinic phase with high purity and crystallinity .A combined growth mechanism of oriented attachment followed by Ostwald ripening is speculated for the formation of rod-like Bi2 O3 based on experimental results .