Enhancement of conductivity by diameter control of polyimide-based electrospun carbon nanofibers.
Enhancement of conductivity by diameter control of polyimide-based electrospun carbon nanofibers.
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DOI：
10.1021/jp075541q
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发表时间：
2007-09
期刊：
影响因子：
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通讯作者：
N. T. Xuyen;E. Ra;Hong‐Zhang Geng;Ki Kang Kim;K. An;Y. H. Lee
中科院分区：
文献类型：
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作者：
N. T. Xuyen;E. Ra;Hong‐Zhang Geng;Ki Kang Kim;K. An;Y. H. Lee
以三乙胺为催化剂载体，聚合了均苯四甲酸二酸二酯聚酰胺(oda-Pmda)，以控制其相对分子质量。该聚合物用于电纺制备PAA纳米纤维，PAA纳米纤维是碳纳米纤维的先驱体。对催化剂用量和PAA溶液浓度进行了优化，制得直径约80 nm的聚酰亚胺基碳纳米纤维。研究了PAA的相对分子质量、偏压和纺丝速度对电纺PAA和聚酰亚胺纳米纤维形态的影响。结果表明，碳纳米纤维毡的电导率随着纳米纤维直径的增大而降低，其中聚酰亚胺基碳纳米纤维毡的电导率远高于其他类型的碳纳米纤维毡。研究发现，提高碳纳米纤维垫的导电性的关键因素是纳米纤维之间的交叉连接的数量。
Oxydianiline-pyromellitic dianhydride poly(amic acid) (ODA-PMDA PAA) was polymerized with a catalyst support of triethyl amine for controlling molecular weight. This polymer was used for electrospinning in the preparation of PAA nanofibers, a precursor of carbon nanofibers. Here the amount of catalyst and concentration of PAA solution were optimized to produce polyimide-based carbon nanofibers approximately 80 nm in diameter. The effects of molecular weight of PAA, bias voltage, and spinning rate on the morphology of electrospun PAA and polyimide nanofibers have been evaluated. We showed that the conductivity of the carbon nanofiber mat decreased with increasing nanofiber diameter, where the conductivity of polyimide-based carbon nanofiber mat was much higher than those of other types of carbon nanofiber mat. The key ingredient to increase conductivity in a carbon nanofiber mat was found to be the number of cross junctions between nanofibers.