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通过光刺激放电(PSD)技术研究了纳米粉末掺杂低密度聚乙烯(LDPE)中的陷阱能级.利用连续扫描法得到了不同掺杂比例的Al_2O_3,MgO纳米粉末掺杂试样以及相同掺杂比例的多种纳米粉末掺杂试样的PSD电流谱,定性地得出了试样陷阱能级的深浅变化.分步扫描法定量地描述了LDPE试样在Al_2O_3纳米掺杂前后陷阱能量分布的变化.结果表明,掺杂比例大于0.2%的Al_2O_3纳米粉末掺杂、大于0.5%的MgO纳米粉末掺杂能够显著地使得LDPE陷阱能级变深.结合纳米掺杂对LDPE空间电荷注入影响的相关报道,可推测纳米掺杂对空间电荷注入的抑制与试样中陷阱能级变深存在密切的关联.
The trap level of LDPE doped with nano-powder was studied by using photo-stimulated discharge (PSD) technique.The doped samples of Al 2 O 3 and MgO nano-powders with different doping ratios and the same doped The PSD current spectra of various nano-powder doping samples were qualitatively and quantitatively obtained.The variation of the trap energy distribution of LDPE sample before and after the nano-doping of Al 2 O 3 was described by the step-and-scan method The results show that the doping level of MgO nanopowders can notably decrease the energy level of LDPE trap when doped with more than 0.2% Al 2 O 3 nanopowder.Moreover, the effect of nanosize doping on the space charge injection of LDPE It is speculated that the inhibition of space charge injection by nano-doping is closely related to the change of the trap level in the sample.