氢氧化钠浓度对硫化锌定向附着生长动力学的影响。

NaOH concentration effect on the oriented attachment growth kinetics of ZnS.

作者信息

Wang Yonghao, Zhang Jing, Yang Yanlian, Huang Feng, Zheng Jinsheng, Chen Dagui, Yan Fengbo, Lin Zhang, Wang Chen

机构信息

State Key Lab of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, People's Republic of China.

出版信息

J Phys Chem B. 2007 May 17;111(19):5290-4. doi: 10.1021/jp0688613. Epub 2007 Apr 24.

DOI:10.1021/jp0688613

PMID:17451269

Abstract

In this work, the crystal growth kinetics of ZnS nanoparticles coarsened under 100 degrees C with NaOH concentration from 2 to 8 M was investigated, aiming to study the role of NaOH concentration on the oriented attachment growth kinetics. It reveals that 2 M NaOH is sufficient to lead to two-stage growth kinetics of ZnS nanoparticles, resulting in pure and multistep oriented attachment growth characteristics in the first stage. When the NaOH concentration increases, the rate of crystal growth by oriented attachment mechanism increases, while the time period for crystal growth at the pure oriented attachment stage was similar. We suggest that the concentration of solute is critical to enhance the oriented attachment growth rate and achieve exclusively oriented attachment growth of nanoparticles at a large size scale.

摘要

在这项工作中，研究了在100摄氏度下，氢氧化钠浓度为2至8摩尔时，ZnS纳米颗粒粗化的晶体生长动力学，旨在研究氢氧化钠浓度对定向附着生长动力学的作用。结果表明，2摩尔的氢氧化钠足以导致ZnS纳米颗粒的两阶段生长动力学，在第一阶段产生纯的和多步定向附着生长特征。当氢氧化钠浓度增加时，通过定向附着机制的晶体生长速率增加，而在纯定向附着阶段的晶体生长时间段相似。我们认为，溶质浓度对于提高定向附着生长速率以及在大尺寸尺度上实现纳米颗粒的纯定向附着生长至关重要。