ABSTRACT To address the limitations of conventional low‐voltage electric heaters in achieving high saturation temperatures and rapid electrothermal response, this study presents a high‐performance composite film of graphene nanoplatelets (GNP)/multiwalled carbon nanotubes (MWCNT) with a three‐dimensional conductive network, fabricated via a layer‐by‐layer coating and hot‐pressing process, utilizing pretreated natural wood veneer with enhanced hydroxyl group exposure as a sustainable substrate. Thermochemical and microstructural analyses reveal that a 1:1 GNP/MWCNT mass ratio optimizes the synergistic effect, where MWCNT bridges GNP layers to establish a continuous conductive pathway, reducing interfacial resistance and enhancing thermal transport. The resultant composite film with four coating layers (thickness: ~120 μm) exhibits exceptional electrical conductivity (2000 S·m −1 ) and rapid Joule heating response (2 s), achieving a saturation temperature of 66.1°C–67.9°C under 4 V applied voltage. Cyclic stability tests confirm consistent performance over 3600 s at 4 V, with minimal temperature fluctuations. Furthermore, infrared thermography demonstrated uniform heat distribution (Δ T < 3°C across the surface) and superior heating rates (66°C in 40 s) compared to traditional resistance wire films. This scalable approach offers potential for eco‐friendly, high‐efficiency electrothermal materials in decorative applications.
Zhang et al. (Sat,) studied this question.
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