Microstructure development of 35 nm silver nanoparticles during the low temperature sintering was examined in situ as the ambient temperature increased from room temperature up to 450 °C using X-ray diffraction and electron microscopy techniques. Measured particle size increased rapidly up to ∼90 nm in the temperature range between 130 and 250 °C, which is thought to be from the atomic diffusion on the surfaces of nanoparticles. On the other hand, further increase of the annealing temperature results in little or almost no change in the grain size. Therefore, the sintering effect due to the surface diffusion of silver atoms is active only on the surface of nanoparticles whose size is less than ∼90 nm, indicating enhanced atomic mobility of silver atoms on the surface of nanoparticles.
Enhanced Diffusion of Silver Atoms on the Surface of Nanoparticles at Low Temperatures
Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 711-873,
Faculty of Engineering,
Manuscript received December 23, 2011; final manuscript received September 6, 2012; published online March 26, 2013. Assoc. Editor: Jianmin Qu.
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Hong, J., Ding, Y., Moon, K., and Wong, C. P. (March 26, 2013). "Enhanced Diffusion of Silver Atoms on the Surface of Nanoparticles at Low Temperatures." ASME. J. Electron. Packag. March 2013; 135(1): 011002. https://doi.org/10.1115/1.4023910
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