One of the unusual properties of metal nanoclusters is the size dependence of the melting temperature. Studies show that the melting temperature is a decreasing function of the cluster diameter, although the actual dependence is not known, due to the difficulties associated with the experimental measurements. We have synthesized narrow dispersity alkanethiol-functionalized Au and Pt nanoclusters in inverse micellar solutions and have measured the sintering temperatures of these films using a capacitance technique to determine the onset of film conductivity. Cluster sintering is accompanied by pronounced optical changes and a thermal signature that can be observed in differential thermal analysis. The large optical absorbance of nanocluster films makes laser sintering a practical method for the formation of metallization layers.
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Martin et al. (2002) studied this question.
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