Title

Sicn Ceramic Fibers With Aligned Carbon Nanotubes

Keywords

Align; Carbon nanotubes; Electrospun fibers; Polymer-derived ceramic

Abstract

Polymer-derived SiCN ceramic fibers with aligned multiwalled carbon nanotubes (MWCNTs) are fabricated through the electrospinning of polyaluminasilazane solutions with well-dispersed MWCNTs followed by pyrolysis. Poly(3-hexylthiophene)-b-poly (poly (ethylene glycol) methyl ether acrylate) (P3HT-b-PPEGA), a conjugated block copolymer compatible with polyaluminasilazane, is used to functionalize MWCNT surfaces with PPEGA, providing a non-invasive approach to disperse carbon nanotubes in polyaluminasilazane chloroform solutions. The electrospinning of the MWCNT/polyaluminasilazane solutions generates polymer fibers with aligned MWCNTs where MWCNTs are oriented along the electrospun jet by a sink flow. The subsequent pyrolysis of the obtained composite fibers produces ceramic fibers with aligned MWCNTs. The study of the effect of polymer and CNT concentration on the fiber structures shows that the fiber size increases with the increment of polymer concentration; while higher CNT content in the polymer solutions leads to thinner fibers owning to the increased conductivity. Both the SEM and TEM characterization of the polymer and ceramic fibers demonstrates the uniform orientation of CNTs along the fibers, suggesting the excellent dispersion of CNTs and efficient CNT alignment via the electrospinning. The electrical conductivity of a ceramic fibers with 1.2 % aligned MWCNTs is measured to be 1.58×10-6 S/cm that is more than 500 times higher than that of bulk ceramic (3.43×10-9 S/cm). Such approach provides a versatile method to disperse CNTs in preceramic polymer solutions and offers a new approach to integrate aligned CNTs in ceramics.

Publication Date

12-2-2010

Publication Title

International SAMPE Symposium and Exhibition (Proceedings)

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

78649483096 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/78649483096

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