Figure 2.

The evidence for retardation of particle melting. a , b and c are the TEM images taken at the time of 9’, 23’40” and 31’52”, respectively. As recorded by the thermocouple, the corresponding heating temperatures are 200, 300 and 325 °C. The irregular edges of the insets are due to the cut of the frames from the DV. The sample kept shrinking when it was heated. The arrows point to the light vacancies due to the evaporation of the cores. (d) was taken at the heating temperature of 310 °C. It shares the same scales bar as (a)

Song et al. Nanoscale Research Letters 2009 5:138-142   doi:10.1007/s11671-009-9455-y