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

作　　者：李赞 李怡 蒋朵 杜飞鹏[1] 张云飞[1] LI Zan;LI Yi;JIANG Duo;DU Feipeng;ZHANG Yunfei(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan430205,China)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205

出　　处：《武汉工程大学学报》2024年第4期398-403,共6页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金(51803157)。

摘　　要：以单壁碳纳米管(SWCNT)为基体,掺入适量的Cu^(2+)或[Cu(NH_(3))_(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Cu^(2+)-PEI/SWCNT和[Cu(NH_(3))_(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Cu^(2+)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1101.3 S·cm-1,功率因子最高达到93.4μW·m^(-1)·K^(-2)。掺杂[Cu(NH_(3))_(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45.0μV·K^(-1),功率因子最高达到72.3μW·m^(-1)·K^(-2)。虽然Cu^(2+)和[Cu(NH_(3))_(4)]^(2+)提升SWCNT热电性能的机理不同,但功率因子都高于PEI/SWCNT(55.7μW·m^(-1)·K^(-2))。Using single-wall carbon nanotubes(SWCNTs)as matrix and an appropriate amount of Cu^(2+)or[Cu(NH_(3))_(4)]^(2+)and polyethyleneimine(PEI)as dopants,Cu^(2+)-PEI/SWCNT and[Cu(NH_(3))_(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 Cu^(2+)and PEI.The maximum conductivity achieved is 1101.3 S·cm^(-1),with the highest power factor of 93.4μW·m^(-1)·K^(-2).Doping with[Cu(NH_(3))_(4)]^(2+)and PEI only increased the SWCNT carrier mobility,significantly enhancing the system's Seebeck coefficient,with a maximum value of 45.0μV·K^(-1),and the highest power factor of 72.3μW·m^(-1)·K^(-2).The mechanisms through which Cu^(2+)and[Cu(NH_(3))_(4)]^(2+)enhance the thermoelectric performance of SWCNT are different,but both power factors surpassing that of PEI/SWCNT(55.7μW·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 

分 类 号：O631[理学—高分子化学] TB34[理学—化学]