Thermal Radiation Emission From 3D Graphene Networks

ABSTRACT The emission of thermal radiation represents a fundamental mechanism of heat exchange between bodies at finite temperature. A deep understanding of this process is therefore essential across multiple scientific disciplines such as chemistry, biology, and physics, as it triggers the development of a wide range of advanced and unconventional applications. In this work, the thermal emissivity properties of three‐dimensional (3D) graphene network samples with different densities and pore sizes are investigated as a function of frequency and temperature. Thermal emission intensity spectra are acquired in the Infrared spectral range at six different temperatures (240°C–500°C), and compared with a silicon carbide (SiC) reference. 3D graphene materials exhibit an exceptionally high emissivity‐to‐density ratio ranging from 10 ³ to 10 ⁴ times greater than the reference SiC thermal emitter, combined with broadband and homogeneous spectral emission, remarkable mechanical flexibility, and robust temperature resistance. These unique properties make 3D graphene networks promising candidates for applications such as Infrared radiation sources.