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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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425001930 |
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| author | Peng Wu Jiayun Feng Yiping Wang Geng Li Zirui Tong Shang Wang Yongchun Zou Yanhong Tian |
| author_facet | Peng Wu Jiayun Feng Yiping Wang Geng Li Zirui Tong Shang Wang Yongchun Zou Yanhong Tian |
| author_sort | Peng Wu |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-7df156b8db184e0d891422b506b5072c |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-7df156b8db184e0d891422b506b5072c2025-01-30T05:14:21ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013522532262Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observationPeng Wu0Jiayun Feng1Yiping Wang2Geng Li3Zirui Tong4Shang Wang5Yongchun Zou6Yanhong Tian7State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou, 450000, ChinaState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou, 450000, China; Corresponding author. State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China.State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou, 450000, ChinaState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou, 450000, ChinaState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, ChinaState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou, 450000, ChinaCenter for Analysis and Measurement, Harbin Institute of Technology, Harbin, 150001, ChinaState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin, 150001, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou, 450000, China; Corresponding author. State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China.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.http://www.sciencedirect.com/science/article/pii/S2238785425001930Ag nanoparticlesMolecular dynamics simulationSinteringMicrostructure evolution |
| spellingShingle | Peng Wu Jiayun Feng Yiping Wang Geng Li Zirui Tong Shang Wang Yongchun Zou Yanhong Tian Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observation Journal of Materials Research and Technology Ag nanoparticles Molecular dynamics simulation Sintering Microstructure evolution |
| title | Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observation |
| title_full | Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observation |
| title_fullStr | Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observation |
| title_full_unstemmed | Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observation |
| title_short | Growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in-situ TEM observation |
| title_sort | growth kinetics of sintering neck and particle rotation mechanism of silver nanoparticles by molecular dynamics simulation and in situ tem observation |
| topic | Ag nanoparticles Molecular dynamics simulation Sintering Microstructure evolution |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425001930 |
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