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将不同比例的多壁碳管(MWNTs)与聚偏二氟乙烯(PVDF)聚合物混合后,喷涂于n型ZnO半导体纳米线阵列上,制备了一种新型ZnO纳米线基MWNTs/PVDF热电复合材料.与以往采用价格昂贵的p型与n型单壁碳纳米管(SWNTs)与聚合物混合制备的复合热电材料特性相比,这种新型热电复合材料在降低制造成本的同时,利用分散于聚合物中MWNTs的一维电子传输特性及形成的大量界面势垒,加上ZnO半导体纳米线具有的较高载流子密度与迁移率,提高了复合热电材料中电子的输运特性,增加了材料对声子的散射强度.测试发现,在一定的温度梯度下,随着MWNTs添加质量百分比的增加,热电材料的温差电动势和电导率也随之增加,但其Seebeck系数变化量不大.研究表明,这种热电材料有望替代采用p型与n型SWNTs构建的SWNTs/PVDF复合热电材料.研究结果对开发超轻、无毒、廉价、可应用于各种微纳电子领域的新型电源具有重要的参考价值.
A new type of ZnO nanowire-based MWNTs / PVDF thermoelectric composite was prepared by mixing different proportions of MWNTs and polyvinylidene difluoride (PVDF) polymer and spraying on the n-type ZnO semiconductor nanowire arrays. Compared with the previous composite thermoelectric materials prepared by mixing expensive p-type and n-type single-walled carbon nanotubes (SWNTs) with polymers, this new type of thermoelectric composite can reduce the manufacturing cost and at the same time, The one-dimensional electron transport properties of MWNTs and the large number of interface barriers formed in the polymer, together with the higher carrier density and mobility of ZnO semiconductor nanowires, enhance the electron transport properties of the composite thermoelectric materials and increase the The scattering intensity of materials on phonons was tested.With the increase of mass percent of MWNTs, the temperature difference emf and the conductivity of the thermoelectric materials also increased with the increase of the mass fraction of the MWNTs, but the change of the Seebeck coefficient did not change much. It is indicated that this kind of thermoelectric material is expected to replace the SWNTs / PVDF composite thermoelectric material constructed by p-type and n-type SWNTs.The research results are very helpful for the development of ultra-light, non-toxic and cheap, which can be applied to various micro- Power has important reference value.