We report observations of the evaporation anisotropy of substrate-free Zn nanocrystals (NCs) as imaged from electron microscopy and determine the onset temperature of evaporation as a function of NC size by the gas-phase ion-mobility method. The observed shape transformation of free NCs is fundamentally different from those observed in traditional hot-stage TEM heating experiments. The onset temperature for evaporation decreases as the NC size decreases and is analogous to the Kelvin effect. The cohesive energy of bulk Zn is determined to be 1.8 ± 0.1 eV from the size-dependent evaporation data. A mechanism based on crystal face dependent surface melting is proposed to explain the evaporation anisotropy effect.
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Ma et al. (2011) studied this question.
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