The thermoelectric module can directly convert heat energy generated from natural heat sources and waste heat that is common in industrial production and daily life into valuable electrical energy. In order to meet the sustainable development strategy of energy, more efforts should be made to develop environmentally friendly and inexpensive thermoelectric materials. Carbon nanotubes have excellent electrical properties and unique advantages, causing great concern in flexible thermoelectric applications. At present, thermoelectric research on carbon nanotubes is mainly concentrated on carbon nanotube films and carbon nanotube/polymer composite films. These samples are almost all prepared based on dispersed carbon nanotube solutions, and the obtained thermoelectric films generally have low conductivity. Therefore, the overall thermoelectric power factor is not very high, which directly limits the maximum power that the material can output. Researchers generally have to obtain high-power-factor thermoelectric films through relatively complicated and complicated processes. In addition, due to the difficulty in measuring the in-plane thermal conductivity of thin films, especially thin films, most researchers use the thermal conductivity in the out-of-plane direction or the thermal conductivity values ​​of similar carbon nanotubes in other literature. To estimate the thermoelectric value. The film tends to have anisotropy, so the error in thermoelectric performance obtained by the evaluation is large.
Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics (CPC) Advanced Materials and Structure Analysis Laboratory “Nanomaterials and Mesoscopic Physics†research group has been working on the preparation, properties, and applications of carbon nanotubes for many years. On the basis of previous work, Dr. Zhou Wenbin, a doctoral student of the Chinese Academy of Sciences Academician Shi Sishen, and the group of doctoral students Fan Qingxia, Dr. Wang Yanchun, and researcher Zhou Wei, have developed a simple and convenient measurement method and device for thermoelectric properties (Chinese invention Patent application No.1) can measure the thermoelectric properties (thermal conductivity, conductivity, and Seebeck coefficient) of the same quasi-one-dimensional conductive sample in the same direction, and solves the difficulty of measuring the thermal conductivity of the carbon nanotube film in-plane. problem.
Using the self-designed quasi-one-dimensional thermoelectric property measuring device of the conductive material, the thermal conductivity can be measured in a high vacuum of 10-4 Pa, effectively eliminating the huge convection heat dissipation effect of the carbon nanotube film, and based on one-dimensional Steady-state heat transport equations take into account the effects of radiative heat dissipation in the establishment of the theoretical model. According to the theoretically deduced formula, the sample can be self-heated by direct current in a high-vacuum environment, and the dependence of the sample resistance on temperature is measured for temperature. Monitoring, the sample itself as a heater and resistance thermometer, without the need to introduce additional heating or temperature measuring device, the final measurement of the resistance of the suspension section of the sample, you can calculate the thermal conductivity of the material. In addition, the thermoelectric property measuring device can also be used to measure the conductivity and Seebeck coefficient of the same film strip or fiber using a four-electrode method and a steady-state method, and finally achieve an accurate evaluation of the thermoelectric performance. The systematic study on the thermoelectric properties of carbon nanotube films and fibers prepared by floating catalytic chemical vapor deposition shows that these continuous network carbon nanotube films and fibers have excellent p-type thermoelectric power factor (maximum value of 2482 μW m at room temperature) -1 K-2), is an ideal green, flexible thermoelectric material. The relevant research results were published in Small (2016, 12, 3407–3414).
This work was supported by the Ministry of Science and Technology, the National Natural Science Foundation of China, and the Chinese Academy of Sciences.
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