Browsing by Author "Lai, Huang-Yen"

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Real Time Observation of the Formation of Hollow Nanostructures through Solid State Reactions
(2014-05-06)
Lai, Huang-Yen
;
Huang, Chun-Wei
;
Chiu, Chung-Hua
;
Wang, Chun-Wen
;
Chen, Jui-Yuan
We demonstrate the formation of hollow nickel germanide nanostructures of Ni-Ge core-shell nanoparticles by solid state reactions. The structural evolutions of nickel germanide hollow nanostructures have been investigated in real-time ultrahigh vacuum transmission electron microscopy (UHV-TEM). Annealed above 450 degrees C, the nonequilibrium interdiffusion of core and shell species occurred at the interface; thus, Ni germanide hollow nanostructures were formed by solid state reactions involving the Kirkendall effect. In addition, the different hollow nanostructures formed from different core diameters of Ni-Ge core-shell nanoparticles have been studied. Also, we propose the mechanism with effects of the size and annealing duration on the solid state reactions based on the Kirkendall effect.