Nucleation and growth of PbS nanocrystals and simulation of X-ray diffraction patterns

被引：10

作者：

Gurin, VS ^{[1
]}

机构：

[1] Belarusian State Univ, Phys Chem Res Inst, Minsk 220080, BELARUS

来源：

JOURNAL OF CRYSTAL GROWTH | 1998年 / 191卷 / 1-2期

关键词：

nanocrystals; lead sulfide; X-ray diffraction; scanning probe microscopy;

D O I：

10.1016/S0022-0248(98)00038-4

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Ultrasmall particles of lead sulfide were synthesized from lead ions and long-chain thiols in a non-aqueous medium. The growth of nanocrystals with the macroscopic rocksalt lattice (up to size > 10 nm) proceeds through several steps: Pb-thiolate complexes with no solid phase, small nuclei at the beginning of crystal lattice formation, and nanometer particles with a bulk-like structure. This process is studied by X-ray diffraction (XRD), scanning tunneling microscopy (STM), and atomic force microscopy (AFM). XRD patterns are simulated with sufficiently good fit to the experiment for rocksalt-type model lattices including 27, 75, 125, and 729 atoms. Lead sulfide particles formed at the different steps show the pronounced quantum-size effect in optical spectra, They can be precipitated from colloids in the form of a stable solid phase. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：161 / 165

页数：5

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