Preparation and characterization of copper ions-doped polyethyleneimine/carbon nanotubes thermoelectric thin films
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).
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