Chandrashekar, A.Hegde, M.SiyaKarthik Reddy, B.Jineesh, J.A.Ravichandran, V.Eswaraiah, E.Prabhu, T.N.2026-02-032025Applied Materials Today, 2025, 42, , pp. -23529407https://doi.org/10.1016/j.apmt.2025.102603https://idr.nitk.ac.in/handle/123456789/20430In this work, graphene (GP) and multiwalled carbon nanotubes (MWCNT) are covalently surface functionalized via a green method using clove extract. The clove–modified carbon hybrid silicone rubber (SR) nanocomposites are fabricated by incorporating clove –modified GP (CGP) and MWCNT (CMWCNT) in various weight ratios with a total filler loading of 10 wt%. Our study investigated the effect of green covalent surface modification and the use of hybrid filler on the thermal and electrical properties of the silicone rubber. The nanocomposite with 9:1 hybrid ratio showed the highest thermal conductivity of about 0.406 W m?1 K?1, 103 % enhancement and thermal effusivity of about 766.2 Ws1/2 m?2 K?1, 29.64 % enhancement with respect to pure SR. Thermal management performance was evaluated by applying thermal compounds as thermal interface material on a 1 W light emitting diode (LED) bulb for testing. It was found that during heating, the hybrid composite with 9:1 ratio showed 2.3 °C reduction in the surface temperature of the LED bulb (under ON condition) and reduced the surface temperature by 1.8 ? within 20 s and reached almost room temperature in 100 s (under OFF condition). In addition, nanocomposite with 9:1 hybrid ratio showed excellent thermal stability, enhanced electrical resistivity which presents a promising strategy for designing thermally conductive polymer nanocomposites based thermal interface materials in managing excess heat for thermal management applications. © 2025Hybrid compositesMultiwalled carbon nanotubes (MWCN)NanoclayNanocompositesRubber testingSurface temperatureThermal insulating materialsCarbon nanofillerGraphenesGreen covalent surface functionalizationMulti-walled-carbon-nanotubesSilicone rubberSilicone rubber nanocompositesSurface FunctionalizationThermalThermal and electrical propertiesSilicones