物理化学学报 >> 2003, Vol. 19 >> Issue (08): 701-704.doi: 10.3866/PKU.WHXB20030805

研究论文 上一篇    下一篇

花生酸单分子膜诱导PbS晶体取向生长的研究

姚素薇;赵培忠;班春梅;刘恒权   

  1. 天津大学化工学院,天津 300072
  • 收稿日期:2003-01-13 修回日期:2003-03-14 发布日期:2003-08-15
  • 通讯作者: 姚素薇 E-mail:yaosuwei@263.net

The PbS Semiconductor Nanocrystallites Epitaxial Growth under Arachidic Acid Monolayer

Yao Su-Wei;Zhao Pei-Zhong;Ban Chun-Mei;Liu Heng-Quan   

  1. School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072
  • Received:2003-01-13 Revised:2003-03-14 Published:2003-08-15
  • Contact: Yao Su-Wei E-mail:yaosuwei@263.net

摘要: 以花生酸单分子膜为模板,诱导沉积了PbS半导体纳米粒子,粒径为30~50 nm.实验发现, 由于花生酸单分子膜的诱导作用, 使得PbS晶体在膜上发生取向生长,可以形成三角形、四边形和棒状的PbS纳米粒子.通过改变单分子膜的表面压,考察了表面压对PbS晶体取向生长的影响,结合透射电镜及电子衍射实验,对PbS晶体的生长机制进行了初步的分析和探讨.

关键词: 花生酸, 单分子膜, 诱导, PbS纳米晶体, 取向生长

Abstract: It was demonstrated by electron diffraction patterns that lead sulfide (PbS) semiconductor particles films were obtained under arachidic acid monolayer, floating on lead nitrate solution, by injection of S2- aqueous beneath the monolayer. Different shapes of the PbS semiconductor nanocrystallites, such as triangle, quadrangle and wooden club, were formed under different surface pressure of monolayer. The influence of surface pressure of monolayer preparation of arachdic acid on the structure of PbS nanocrystallites was studied by TEM images and electron diffraction patterns. Controlling surface pressure at 25 mN•m-1, the epitaxial growth of PbS nanocrystallites with their (111) planes parallelling to the (110) planes of monolayer, was proved by TEM images and electron diffraction patterns. A mechanism for the PbS nanocrystallites epitaxial growth was rationalized in terms of lattic matching between the arachidic acid headgroups in the monolayer and the semiconductor nanocrystallites, which were fabricated under monolayer.

Key words: Arachidic acid, Monolayer, Induce, PbS nanocrystallites, Epitaxial growth