Direct Observation of Aggregative Nanoparticle Growth: Kinetic Modeling of the Size Distribution and Growth Rate

被引:163
作者
Woehl, Taylor J. [1 ]
Park, Chiwoo [2 ]
Evans, James E. [3 ]
Arslan, Ilke [3 ]
Ristenpart, William D. [1 ]
Browning, Nigel D. [1 ,3 ]
机构
[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA
[2] Florida State Univ, Dept Ind & Mfg Engn, Tallahassee, FL 32306 USA
[3] Pacific NW Natl Lab, Richland, WA 99352 USA
基金
美国国家科学基金会;
关键词
In situ TEM; liquid cell TEM; nanoparticle synthesis; nanoparticle aggregation; growth mechanism; TRANSMISSION ELECTRON-MICROSCOPY; IN-SITU; NANOCRYSTAL GROWTH; GOLD NANOPARTICLES; SILVER NANOPARTICLES; PHASE; DIFFUSION; SHAPE; VISUALIZATION; MECHANISMS;
D O I
10.1021/nl4043328
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:373 / 378
页数:6
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