Ultra-Low Thermal Conductivity in W/Al ₂ O ₃ Nanolaminates

Abstract

Atomic layer deposition and magnetron sputter deposition were used to synthesize thin-film multilayers of W/Al(2)O(3). 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 approximately 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.

Atomic-Level Structural and Electronic Properties of Hybrid Inorganic–Organic ZnO:Hydroquinone Superlattices Fabricated by ALD/MLD

“…Superlattices are anticipated to show unusual properties when the thicknesses of individual layers fall below the length scale that characterizes the physical property concerned; for example thermal conductivity is expected to be reduced when the individual layer thickness is less than the mean free path of phonons. This has been shown for purely inorganic nanolaminates 10 and very recently also for ALD/MLD hybrid superlattices prepared at our laboratory. 11 Likewise, the motion of charge carriers in nanostructures is often different (i.e.…”

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

“…Phonon scattering can be significantly impacted by dimensions of fillers, the matrix, and their interfacial regions. Therefore, the interfacial zones predominantly affect the thermal conductivity of the composite [245,246]. As a result, anything that can affect the interfacial regions (e.g., geometry of particles [247][248][249][250][251][252][253], aggregation [254][255][256], interfacial pressure [257], roughness [258][259][260], and the strength of interactions at the interfaces [261][262][263][264][265]) in the composites would influence their thermal conductivity.…”

A robust platform cooled by superconducting electronic refrigerators

“…The outer cooler should aim at high power to shunt the heat leak, and the inner cooler should seek for high performance, either by reducing the size of the cooling junction or by increasing the tunnel barrier thickness for a weaker overheating of the superconducting electrode. 26 Additionally, other material choices, such as nano-perforated, 30,31 nano-laminated, 32,33 or corrugated membranes, 34,35 might also enhance thermal isolation between the cold and the hot regions. Finally, the cryostat used for the present measurement had a small power that was barely enough to support the high input current of the device (200 lA).…”