Ultra-Low Thermal Conductivity in W/Al2O3 Nanolaminates

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Science  13 Feb 2004:
Vol. 303, Issue 5660, pp. 989-990
DOI: 10.1126/science.1093711

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Atomic layer deposition and magnetron sputter deposition were used to synthesize thin-film multilayers of W/Al2O3. With individual layers only a few nanometers thick, the high interface density produced a strong impediment to heat transfer, giving rise to a thermal conductivity of ∼0.6 watts per meter per kelvin. This result suggests that high densities of interfaces between dissimilar materials may provide a route for the production of thermal barriers with ultra-low thermal conductivity.

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