Phase transition of metals in the nanodimensions is of both scientific and technological interest. In this work, we have studied the role of substrates on the melting of gold nanorods (AuNRs). Gold nanorods were prepared using a photochemical method. The melting process was induced by two CW UV-irradiation sources with energies of 4.13 eV and 4.89 eV. Polymer, glass, and quartz substrates were employed in this study. Phase transition was monitored with UV-visible spectroscopy and transmission electron microscopy (TEM). Our findings indicate that the nature of the substrate strongly affects the kinetics of melting of AuNRs. A simple model for energy transfer from the substrate to AuNRs is presented.
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