This paper reports on measurements of the in-plane thermal and electrical conductivities of two suspended Au nanofilms with the same thickness of 23 nm, the widths of 451 and 455 nm, and the lengths of 5.4 and 5.6 mm, respectively. Using direct electrical heating method, the nanofilm is heated in vacuum, and the in-plane thermal conductivity is obtained based on one dimensional heat conduction model. The measured results show that the in-plane thermal and electrical conductivities of the Au nanofilms are greatly lower than the corresponding bulk values from 80 to 300K. However, the Lorenz number of the nanofilms is about three times of the bulk value at 180K. This result indicates that the relation between the thermal and electrical conductivities of the Au nanofilms does not follow the Wiedemann-Franz law.
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