共轭离子液体剥离改性石墨烯的制备及其导电应用

摘要

A conjugated ionic liquid of 1-methyl-3-(9-anthracenylmethyl) imidazole hexafluorophosphate([MAIM]PF6) was synthesized and then was mixed with a common ionic liquid of 1-butyl-3-methylimidazolium hexafluorophosphate([BMIM]PF6) as well as multilayer graphite sheet to produce a few-layer graphene sheet modified with ionic liquid by microwave and ultrasonic treatment.And the few-layer graphene sheet was composed with polyetherimide(PEI) to prepare a grapheme/PEI composite film.The results showed that the synthetic product was proved to be[MAIM]PF6;the thickness of the few-layer graphene was a-bout 5 nm and the ionic liquid did not damage the structure of the graphene sheet;the dispersion of graphene was fairly good in PEI matrix;and the resistivity of the graphene/PEI composite film reached 2.14×105Ω·cm when the mass fraction of graphene was 5%,indicating that the addition of graphene could profoundly improve the conductivity of PEI.%合成了一种共轭离子液体1-甲基-3-(9-蒽甲基)咪唑六氟磷酸盐([MAIM]PF6),将其与常规离子液体1-丁基-3-甲基咪唑六氟磷酸盐([BMIM]PF6)以及多层石墨片混合后,通过微波及超声处理制备离子液体修饰的少层石墨烯;将少层石墨烯与聚醚酰亚胺(PEI)进行复合,制备石墨烯/PEI复合膜.结果表明:合成产物确定为[MAIM]PF6;少层石墨烯厚度约为5 nm,离子液体没有破坏石墨烯片层结构;石墨烯在 PEI基体中分散性好,当石墨烯质量分数为5%时,石墨烯/PEI复合膜的电阻率为2.14 ×105Ω· cm,加入石墨烯可以显著改善PEI的导电性.