Microporous vertically aligned CNT nanocomposites with tunable properties for use in flexible heat sinks

• DOI: 10.1016/j.jsamd.2022.100509
• Publication Date: 2022-09-23T08:59:22Z
• Authors: Ozkan Yildiz; Mostakima M. Lubna; Viswanath P. Ramesh; Mehmet Ozturk; Philip D. Bradford
• Keywords: Polydimethylsiloxane; Microelectronics

Effective thermal management of electronic systems depends on the heat transfer efficiency or dissipation capability and conductivity sink components, which has a critical impact performance devices. The rapidly growing field microelectronics creates an enormous need for next-generation flexible, lightweight sinks. In this work, microporous nanocomposites are fabricated utilizing unique yet easily tunable processing method, targeting heat-sink applications. highly porous low-density nanohybrid structures were in technique using conformally pyrolytic carbon (PyC) coated vertically aligned nanotube (VACNT) arrays polydimethylsiloxane (PDMS) infiltration. Simply by varying concentration PDMS VACNT structure, microporosity can be tuned from 50% to 93%, at same time, density structure varies 0.11 g/cm3 0.51 g/cm3. through-thickness – did not vary substantially with increasing concentration, highest samples exhibited 14.1 W/mK conductivity. flexible nanocomposite also showed excellent mechanical resiliency complete recovery 80% compressive strain. final fins was controlled laser etching technique. Analysis array significant ∼27% reduction resistance air velocity 1.5 m/s about ∼40% improvement output thermoelectric generator (TEG) it mounted. high VACNTs large surface area provided as well laser-etched fins, all together contributed better performance.