Anomalous thermal behavior of gold nanostructuresK. K. Nanda1, A. Maisels2, F. E. Kruis2 and B. Rellinghaus3
1 Materials Research Centre, Indian Institute of Science - Bangalore, 560012, India
2 Institute for Technology of Nanostructures, University Duisburg-Essen - 47048 Duisburg, Germany
3 Institute of Combustion and Gas Dynamics, University Duisburg-Essen - 47048 Duisburg, Germany
received 26 July 2007; accepted in final form 2 October 2007; published December 2007
published online 30 October 2007
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.
68.60.Dv - Thermal stability; thermal effects.
© Europhysics Letters Association 2007