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(a) Bright-field transmission electron microscopy (TEM) image showing the effect of adding Ti in the Mg target with three kinds of nanoparticles formed; inset shows the particle size distribution. (b) Bright-field image taken at higher magnification shows clearly the hollow Mg core with a MgO shell of thick. Very few Ti nanoparticles with a MgO shell—indicated by an arrow—are observed, as the dark contrast with a hollow Mg core shows. The inset shows the percentage of the three different kinds of nanoparticles observed.
(a) Bright-field TEM images showing the effect of Ti when the nanoparticle size (distribution) is varied. The inset shows the particle size distribution. (b) Bright-field image at higher magnification showing hollow smaller nanoparticles below 15 nm in size, and incomplete hollow Mg core and complete Mg-core nanoparticles as the size increases to above 15 nm. Also the presence of Ti on the center of almost all nanoparticles, irrespective of a hollow Mg core, confirms that Ti acts as a nucleation center for Mg to grow around it. The inset indicates the percentage of the nanoparticles observed when increasing their sizes.
(a) HRTEM image of a Ti core/MgO shell where the Ti(101) plane is resolved. (b) HRTEM image of the hollow Mg-core nanoparticles with a MgO shell, where the (200) plane of MgO is resolved.
Bright-field TEM image of the nanoparticles produced from alloy target (Mg and Ti ) where Mg nanoparticles below 15 nm are hollow.
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