铜离子掺杂聚乙烯亚胺/碳纳米管热电薄膜的制备与表征
Preparation and characterization of copper ions-doped polyethyleneimine/carbon nanotubes thermoelectric thin films
李赞 1李怡 1蒋朵 1杜飞鹏 1张云飞1
作者信息
- 1. 武汉工程大学材料科学与工程学院,湖北 武汉 430205
- 折叠
摘要
以单壁碳纳米管(SWCNT)为基体,掺入适量的Cu2+或[Cu(NH3)4]2+和聚乙烯亚胺(PEI),通过溶液共混和真空抽滤方法制备得到Cu2+-PEI/SWCNT和[Cu(NH3)4]2+-PEI/SWCNT复合薄膜.通过扫描电子显微镜法、X射线能谱仪、红外光谱、拉曼光谱和热电仪器表征了复合薄膜的结构与性能.研究结果表明:适量Cu2+和PEI掺杂SWCNT时,优化了SWCNT的载流子浓度和迁移率,提升了体系的电导率,最大电导率为1 101.3 S·cm-1,功率因子最高达到93.4 μW·m-1·K-2.掺杂[Cu(NH3)4]2+和PEI时,提升了SWCNT的载流子迁移率,显著提升了体系的塞贝克系数,最大塞贝克系数为45.0 μV·K-1,功率因子最高达到72.3 μW·m-1·K-2.虽然Cu2+和[Cu(NH3)4]2+提升SWCNT热电性能的机理不同,但功率因子都高于PEI/SWCNT(55.7 μW·m-1·K-2).
Abstract
Using single-wall carbon nanotubes(SWCNTs)as matrix and an appropriate amount of Cu2+or[Cu(NH3)4]2+and polyethyleneimine(PEI)as dopants,Cu2+-PEI/SWCNT and[Cu(NH3)4]2+-PEI/SWCNT composite thin films were prepared through solution blending and vacuum filtration methods.The structures and properties of the composite films were characterized using scanning electron microscopy,energy-dispersive X-ray spectroscopy,infrared spectroscopy,Raman spectroscopy,and thermoelectric instrument.The results reveal that optimizing the SWCNT carrier concentration and mobility enhances the system conductivity when doping with an appropriate amount of Cu2+and PEI.The maximum conductivity achieved is 1 101.3 S·cm-1,with the highest power factor of 93.4 μW·m-1·K-2.Doping with[Cu(NH3)4]2+and PEI only increased the SWCNT carrier mobility,significantly enhancing the system's Seebeck coefficient,with a maximum value of 45.0 μV·K-1,and the highest power factor of 72.3 μW·m-1·K-2.The mechanisms through which Cu2+and[Cu(NH3)4]2+enhance the thermoelectric performance of SWCNT are different,but both power factors surpassing that of PEI/SWCNT(55.7 μW·m-1·K-2).
关键词
铜离子/铜氨离子/聚乙烯亚胺/单壁碳纳米管/复合薄膜/热电性能Key words
copper ions/copper ammonia ions/polyethyleneimine/single-wall carbon nanotubes/composite film/thermoelectric performance引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据