首页|碳纳米管纤维基热电器件的制备及其性能研究

碳纳米管纤维基热电器件的制备及其性能研究

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利用温差发电的柔性热电器件具有可持续、环保和可穿戴的优点,但是多数热电器件需要利用金属电极相互连接,这在一定程度上降低了热电器件的整体性能.本文利用 OA和 FeCl3 对碳纳米管纤维进行 N型和 P型掺杂,制备了无需金属电极连接的具有连续 P-N 结构的热电纤维,并且利用热电纤维制备了 3D 热电器件.结果显示,N型和 P型碳纳米管纤维基热电纤维分别具有-69.7、62.2 μV/K的高塞贝克系数和 552.9、431.4 μW/(m·K2)的高功率因数,3D热电器件能够利用人体与环境之间垂直方向上的温差产生开路电压,并可用作简单的温度传感器.这种 3D热电器件具有优异的热电性能,在柔性自供电领域有广泛的应用前景.
Preparation and performance research of carbon nanotube fiber-based thermoelectric devices
With the continuous development of flexible wearable electronic devices,thermoelectric(TE)devices,which can harvest energy from human body heat,are highly demanded as a potential wearable energy device.Wearable TE devices based on Seebeck effect,which can convert human body heat into electrical energy,are considered as one of the effective solutions to solve the energy problem of wearable electronic devices.TE devices can directly convert waste heat into electrical energy,which greatly improves energy utilization.And wearable TE devices have significant advantages in human body applications,such as flexibility,environmental protection,and sustainability.In the past few decades,people have been working on developing flexible TE devices.However,traditional inorganic thermoelectric materials have limitations such as heavy weight,high rigidity,and toxicity,which limit their application in flexible devices.In addition,conventional two-dimensional(2D)architecture thermoelectric devices can only harvest thermal energy on a flat surface,making it difficult to utilize the temperature difference in the vertical gradient formed between the human body and the environment.In order to improve the flexibility and TE performance of TE devices,and to better utilize the vertical temperature difference between the human body and the environment,carbon nanotube fibers with high conductivity,flexibility,and light texture are used as the matrix.Oleylamine(OA)and FeCl3 were selected as N-type and P-type dopants,and a simple impregnation method was used to perform N-type and P-type doping on the carbon nanotubes.By reasonably regulating the concentrations of OA solution and FeCl3 solution,the optimal concentration was selected for doping carbon nanotube fibers,resulting in the preparation of P-N structured carbon nanotube fibers.Due to the lack of metal electrode connections,carbon nanotube fibers exhibit excellent TE performance.Then,the carbon nanotube fibers with P-N structure were combined with a three-dimensional(3D)mold to prepare flexible TE devices with 3D structure.The successful doping of OA and FeCl3 was confirmed by SEM,EDS,and Raman characterization,and the impact of OA and FeCl3 on the structure of carbon nanotube fibers was analyzed.In addition,the study tested the effects of different concentrations of OA and FeCl3 solutions on the electrical conductivity,Seebeck coefficient,and power factor of carbon nanotube fibers,as well as the TE performance of TE devices on the human body.The study also investigated the potential of thermoelectric devices as flexible temperature sensors.The results indicate that when a 0.2 g/mL OA solution was used as the N-type dopant,the Seebeck coefficient of N-type carbon nanotube fibers was-69.7 μV/K,and the power factor was approximately 552.9 μW/(m·K2).On the other hand,when a 2.5 mmol/L FeCl3 solution was used for P-type doping of the carbon nanotube fibers,the Seebeck coefficient was 62.2 μV/K,and the power factor was around 431.4 μW/(m·K2).Furthermore,the N-row carbon nanotube fibers exhibited excellent air stability for over108 hours.Additionally,the flexible TE device was capable of generating an open-circuit voltage of 13 mV and an output power of approximately17.9 nW at ΔT =7℃,while also demonstrating favorable cycle stability.By utilizing OA and FeCl3 as dopants for N-type and P-type,respectively,a one-step doping process was employed to successfully fabricate carbon nanotube fibers with a P-N structure.These fibers were then integrated with a three-dimensional mold to create 3D TE devices.This approach enhanced the electrical conductivity and Seebeck coefficient of the carbon nanotube fibers,consequently improving the TE performance.Moreover,the TE devices based on carbon nanotube fibers exhibited superior flexibility and the ability to conform well to human skin,thereby offering valuable insights for the development of TE fibers and TE devices suitable for wearable applications.

carbon nanotube fibersP-N structurethermoelectric fibersthermoelectric devicestemperature sensor

余龙、邱华、顾鹏

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江南大学 纺织科学与工程学院,江苏 无锡 214122

碳纳米管纤维 P-N结构 热电纤维 热电器件 温度传感器

国家中医药管理局创新团队与人才培养计划项目

ZYYCXTD-D-202206

2024

丝绸
浙江理工大学 中国丝绸协会 中国纺织信息中心

丝绸

CSTPCD北大核心
影响因子:0.567
ISSN:1001-7003
年,卷(期):2024.61(2)
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