Multi‐contact hybrid thermal conductive filler Al₂O₃@AgNPs optimized three‐dimensional thermal network for flexible thermal interface materials

Abstract

In this work, a multi‐contact Al2O3@AgNPs hybrid thermal conductive filler was synthesized by in‐situ growth method to fill high thermal conductivity polydimethylsiloxane (PDMS)‐based composites to prepare TIMs. And the thermal conductivity, electrical conductivity, and mechanical properties of the composite materials were studied. During the synthesis process of the multi‐contact hybrid filler, different concentrations of silver ions were reduced to generate silver nanoparticles and attached to the surface of Al2O3. Al2O3@AgNPs/PDMS thermally conductive composites were prepared by changing the filler addition. Using SEM, XPS, and XRD is used to characterize the morphology and chemical composition of Al2O3@AgNPs hybrid filler. The thermal conductivity of PDMS‐based composites with different AgNPs content under 70 wt% filler loading was studied. The results show that the thermal conductivity of PDMS‐based composites filled with 7owt%Al2O3@3AgNPs/PDMS multi‐contact hybrid filler is 0.67 W/m·K, which is 3.72 times that of pure PDMS, and is higher than that of unmodified Al2O3 with the same addition amount. /PDMS composite material has a high thermal conductivity of 24%. This work provides a new idea for the design and manufacture of high thermal conductivity hybrid fillers for TIMs.

Constructing magnetic/dielectric dual loss and phonon/electron thermal carriers γ-Al2O3-based yolk–shell microspheres to collaboratively advance microwave absorption and heat conduction

“…It can thus be suggested that compared to other morphologies, such as particles, microspheres, and foams, the yolk–shell structure assembled from nanosheets has a decided advantage in thermally conductive fillers. 18,20,37–50…”

“…It can thus be suggested that compared to other morphologies, such as particles, microspheres, and foams, the yolk-shell structure assembled from nanosheets has a decided advantage in thermally conductive fillers. 18,20,[37][38][39][40][41][42][43][44][45][46][47][48][49][50] By contrast, g-Al 2 O 3 @C YSMSs have a slightly lower HC of 2.06 W m À1 K À1 (2.4% decrease), which is mainly caused by the phonon scattering at the interface between g-Al 2 O 3 and amorphous carbon, together with the intrinsic low heat/electrical conductance of amorphous carbon with low graphitization (Fig. 7c1).…”

A review: From the whole process of making thermal conductive polymer, the effective method of improving thermal conductivity

“…Therefore, it is necessary to select the appropriate reagent, dose, and method to modify the thermally conductive filler. Huang et al 135 synthesized a multi‐contact Al 2 O 3 @AgNPs hybrid thermal conductive filler by in‐situ growth method. Silver nanoparticles with different concentrations of silver ions were reduced to form and attached to the Al 2 O 3 surface.…”

Synchronously boosting microwave-absorbing and heat-conducting capabilities in CeO2/Ce(OH)3 core–shell nanorods/nanofibers via Fe-doping amount control

“…7a3). 2,[29][30][31]42,[49][50][51][52][53][54][55][56][57][58][59][60][61][62] Fig. 7b1-b3 illustrate the thermal conduction mechanism of Fe-doped CeO 2 /Ce(OH) 3 CSNFs.…”