School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
ACS Appl Mater Interfaces. 2016 Jun 15;8(23):14788-94. doi: 10.1021/acsami.6b01845. Epub 2016 Jun 2.
Nanoporous alumina membranes are filled with multiwalled carbon nanotubes (MWCNTs) and then poly(3-hexylthiophene-2,5-diyl) (P3HT) melt, resulting in nanofibers with nanoconfinement induced coalignment of both MWCNT and polymer chains. The simple sonication process proposed here can achieve vertically aligned arrays of P3HT/MWCNT composite nanofibers with 3 wt % to 55 wt % MWCNT content, measured using thermogravimetric methods. Electrical and thermal transport in the composite nanofibers improves drastically with increasing carbon nanotube content where nanofiber thermal conductivity peaks at 4.7 ± 1.1 Wm(-1)K(-1) for 24 wt % MWCNT and electrical percolation occurs once 20 wt % MWCNT content is surpassed. This is the first report of the thermal conductivity of template fabricated composite nanofibers and the first proposed processing technique to enable template fabrication of composite nanofibers with high filler content and long aspect ratio fillers, where enhanced properties can also be realized on the macroscale due to vertical alignment of the nanofibers. These materials are interesting for thermal management applications due to their high thermal conductivity and temperature stability.
纳米多孔氧化铝膜中填充有多壁碳纳米管 (MWCNTs)，然后填充聚(3-己基噻吩-2,5-二基) (P3HT) 熔体，导致纳米纤维具有纳米限制诱导的 MWCNT 和聚合物链的共取向。这里提出的简单超声处理方法可以实现垂直排列的 P3HT/MWCNT 复合纳米纤维阵列，MWCNT 含量为 3wt%至 55wt%，使用热重法测量。随着碳纳米管含量的增加，复合纳米纤维的电和热传输急剧改善，其中纳米纤维的热导率在 24wt%MWCNT 时达到峰值 4.7±1.1Wm(-1)K(-1)，而一旦超过 20wt%MWCNT 含量就会发生电渗流。这是模板制备复合纳米纤维热导率的首次报道，也是首次提出的用于制造具有高填充含量和长纵横比填充剂的复合纳米纤维的模板制造技术，由于纳米纤维的垂直排列，也可以在宏观尺度上实现增强的性能。由于这些材料具有高热导率和温度稳定性，因此它们对于热管理应用很有趣。
