以纸纤维作为基体,稀土掺杂碳纳米管作为导电剂,采用高速剪切分散工艺混合均匀,通过真空抽滤制备碳纳米管复合导电纸,并研究了其电磁屏蔽性能。采用扫描电子显微镜、四探针电阻仪和矢量网络分析仪对其进行表征。结果表明,分别采用CeO2、Pr6O11和Sm2O3掺杂碳纳米管作为导电添加剂。CeO2作为稀土添加剂时,电磁屏蔽性能最佳,导电纸的电磁屏蔽性能提高了约2dB。CeO2稀土氧化物在碳纳米管中掺杂量从15%(wt,质量分数,下同)增加到35%时,碳纳米管导电纸的电磁屏蔽性能先增强后减弱,在CeO2掺杂量为20%时达到最大值,在1000MHz时屏蔽效能达到-29.4dB。
The electromagnetic interference shielding effectiveness (EMI SE) of carbon nanotube conductive paper were studied.Pulp fibers were used as matrix and CNTs and rare earth oxide were doped as additives.The two parts were mixed by high-speed shearing in water,and made into composite paper by method of vacuum filtration.The flexible conductive paper showed good electrical conductivity and electromagnetic interference shielding effectiveness.The papers were characterized by scanning electron microscopy (SEM),four-point probes (4PP) and vector network analyzer.CeO2,Pr6O11 and Sm2O3 were used to doping CNTs.Different content of CeO2 (15wt%～35wt%) was doped into CNTs.The results showed that the papers which were doped with 20wt% CeO2 performed excellent EMI SE.The EMI SE of CNT paper increased about 2dB comparing with raw CNT papers in the frequency range of 200～1600MHz.The SE reached a maximum value of -29.4dB at the frequency of 1000MHz.
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基金资助
江西省科技厅科研项目(20142BBE50071);江西省教育厅(KJLD13006)
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