Gold nanostructures exhibit anomalous thermal behavior such as the shape transformation of nanorods, generation of nanoparticles by heating a mesh etc. at extremely low temperature. Here, we report a lower onset temperature of evaporation as compared with that of Ag. This appears to be inconsistent at first glance as the vapor pressure of bulk Au is lower as compared to that of Ag at a particular temperature. Analysis of our experimental results based on the thermodynamic model suggests that the surface melting is the most plausible mechanism for the unusual thermal behavior of Au.
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Nanda et al. (2007) studied this question.
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