As a traditional carbon material, natural graphite has excellent electrical properties and huge reserves, making it a potential candidate for thermoelectric materials. By doping Fe, p-type graphite-based thermoelectric materials were prepared. By conjugating with polyethylenimine, the stable n-type graphite-based thermoelectric material was prepared. A thermoelectric device composed of four pairs of p-n graphite units was fabricated by casting process. Under indoor conditions at 305 K, the device was heated by a 333 K heating plate, generating a voltage of 6 mV and a current of 1 nA. The surface temperature of the device rises from room temperature to 333 K in just 1 min under natural light irradiation of 1500 W, producing an output voltage of 4 mV. Additionally, flexible devices can be drawn by using a graphite slurry, and a flexible device composed of four pairs of p-n units can generate a temperature difference of 1.3 K and a voltage of 0.67 mV when curled around a finger.

中文翻译：

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石墨基“光-热-电”转化材料的制备及性能


天然石墨作为一种传统的碳材料，具有优异的电性能和巨大的储量，使其成为热电材料的潜在候选者。通过掺杂 Fe，制备了 p 型石墨基热电材料。通过与聚乙烯亚胺共轭，制备了稳定的 n 型石墨基热电材料。采用铸造工艺制造了由四对 p-n 石墨单元组成的热电器件。在 305 K 的室内条件下，该器件由 333 K 加热板加热，产生 6 mV 的电压和 1 nA 的电流。在 1500 W 的自然光照射下，器件的表面温度在短短 1 分钟内从室温上升到 333 K，产生 4 mV 的输出电压。此外，可以使用石墨浆料拉制柔性器件，由四对 p-n 单元组成的柔性器件在卷曲在手指上时可产生 1.3 K 的温差和 0.67 mV 的电压。