期刊
NANO LETTERS
卷 14, 期 1, 页码 373-378出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl4043328
关键词
In situ TEM; liquid cell TEM; nanoparticle synthesis; nanoparticle aggregation; growth mechanism
类别
资金
- NIH [5RC1GM091755]
- DOE [DE-FG02-03ER46057]
- Presidential Early Career Award for Scientists and Engineers
- UC Lab Fee Program
- UC Academic Senate
- FSU COFRS Award [032968]
- Ralph E. Powe Junior Faculty Enhancement Award
- Chemical Imaging Initiative at Pacific Northwest National Laboratory [DE-AC05-76RL01830]
- Department of Energy's Office of Biological and Environmental Research
- [NSF-CMMI-1334012]
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [RC1GM091755] Funding Source: NIH RePORTER
Direct observations of solution-phase nanoparticle growth using in situ liquid transmission electron microscopy (TEM) have demonstrated the importance of non-classical growth mechanisms, such as aggregation and coalescence, on the growth and final morphology of nanocrystals at the atomic and single nanoparticle scales. To date, groups have quantitatively interpreted the mean growth rate of nanoparticles in terms of the Lifshitz-Slyozov-Wagner (LSW) model for Ostwald ripening, but less attention has been paid to modeling the corresponding particle size distribution. Here we use in situ fluid stage scanning TEM to demonstrate that silver nanoparticles grow by a length-scale dependent mechanism, where individual nanoparticles grow by monomer attachment but ensemble-scale growth is dominated by aggregation. Although our observed mean nanoparticle growth rate is consistent with the LSW model, we show that the corresponding particle size distribution is broader and more symmetric than predicted by LSW. Following direct observations of aggregation, we interpret the ensemble-scale growth using Smoluchowski kinetics and demonstrate that the Smoluchowski model quantitatively captures the mean growth rate and particle size distribution.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据