Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observation
Nanopaste is essential in the packaging of high-power devices, but the sintering kinetics of nanoparticles is still unclear. In this paper, the sintering process of Ag nanoparticles with different sizes was simulated by molecular dynamics simulation, and the simulation results were verified with the...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425001930 |
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| Summary: | Nanopaste is essential in the packaging of high-power devices, but the sintering kinetics of nanoparticles is still unclear. In this paper, the sintering process of Ag nanoparticles with different sizes was simulated by molecular dynamics simulation, and the simulation results were verified with the in-situ observation under transmission electron microscopy (TEM) heating, which further clarified the sintering mechanism of Ag nanoparticles. By analyzing the simulation results, it was found that the length of the sintered necks had a power function relationship with time during the sintering process, and the power exponent increased with the particle size. The power exponent of the sintered particles with a size of 50 nm reached 27 at 250 °C. The stages of sintering were verified at different temperatures in detail according to the molecular dynamics simulation results. At the initial stage at higher temperatures, the particles cyclically expanded and contracted to achieve a preliminary connection, while at the second stage at lower temperatures, the particles rotated directionally to form an effective connection, which has also been observed under in-situ TEM. When the structures in the particles match, the process goes into the third stage, in which the particles combine quickly. Through the whole low temperature sintering process, the particles remain unmelted. |
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| ISSN: | 2238-7854 |