Pressure tuning of the thermal conductance of weak interfaces

Abstract

We use high pressure to reveal the dependence of interfacial heat transport on the stiffness of interfacial bonds. The combination of time-domain thermoreflectance and SiC anvil techniques is used to measure the pressure-dependent thermal conductance G(P ) of clean and modified Al/SiC interfaces at pressures as high as P = 12 GPa. We create low-stiffness, van der Waals-bonded interfaces by transferring a monolayer of graphene onto the SiC surface before depositing the Al film. For such weak interfaces, G(P ) initially increases approximately linearly with P . At high pressures, P > 8 GPa, the thermal conductance of these weak interfaces approaches the high values characteristic of strongly bonded, clean interfaces.

Thermal conductance of strongly bonded metal-oxide interfaces

“…High pressure measurements ensure stiff interfaces with strong atomic bonds. 21 Additionally, the reduction in lattice constant and stiffening of elastic constants with increasing pressure 22 allow us to systematically study how G compares to max G across a range Our standard thermal model for interpreting TDTR data assumes that the laser energy is deposited at the metal film surface and that the intensity fluctuations of the probe beam are proportional to the metal film's surface temperature. 26 Both of these assumptions are invalid for TDTR measurements that use the thin SrRuO 3 films as the optical transducer because the optical penetration depth of SrRuO 3 is 50 nm at the pump/probe wavelength of 785 nm, 23 which is larger than the film thickness.…”

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

“…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. In this section, we will review the parameters affecting the interfacial interactions and their subsequent impact on the thermal conductivity of the composites.…”

Effects of interfacial roughness on phonon transport in bilayer silicon thin films

“…[1][2][3][4][5] Recently, van der Waals (vdW) interaction mediated phonon transport at materials contacts has attracted significant attention because it is commonly encountered in nanocomposites, metrology, and nanoelectronic devices. [6][7][8][9] For example, in carbon nanotube (CNT) and graphene based nanoelectronic devices, they are usually laid on dielectric substrates via van der Waals contacts or interfaces. 10,11 Traditionally, vdW interactions are regarded as a kind of weak coupling mechanism compared to the much stronger bonding forces such as covalent or ionic bonding.…”