Temperature-dependent thermoelectric behavior of metal-doped nanoporous carbon with tailored pore structures for multilevel temperature sensing

초록

Metal-doped nanoporous carbon (MDNC) derived from core-shell metal-organic frameworks (MOFs) exhibits temperature-dependent thermoelectric behavior that is highly sensitive to nanoporous structure and surface interactions. In this study, a pellet-based approach is employed to enable systematic investigation of the Seebeck coefficient and electrical conductivity of MDNC as a function of temperature. Differential scanning calorimetry (DSC) reveals a pronounced desorption process in the temperature range of 80-100 degrees C, which is closely correlated with significant changes in electrical transport properties. To further elucidate this behavior, MDNC samples with different particle sizes (similar to 200 nm and similar to 800 nm) are examined, demonstrating distinct temperature-dependent variations in both Seebeck coefficient and electrical conductivity. These results indicate that temperature-induced desorption plays a critical role in modulating carrier transport through changes in interfacial barriers, scattering mechanisms, and conductive pathway connectivity. The particle-size-dependent nanoporous structure further influences this behavior by altering adsorption/desorption characteristics. Overall, this study provides insight into the coupling between nanoporous structure and temperature-dependent transport behavior in MDNC, offering a framework for understanding and tuning thermoelectric responses in nanoporous carbon systems.

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