Effects of polymer matrices to the formation of silicon carbide (SiC) nanoporous fibers and nanowires under carbothermal reduction

Ping Lu, Qing Huang, Amiya Mukherjee, You Lo Hsieh

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

SiC fibers with varied nano-scale morphologies (i.e., nanowires, nanoparticles, etc) were successfully fabricated by the electrospinning of preceramic polyureasilazane (PUS) with either poly(methyl methacrylate) (PMMA) or polystyrene (PS) into composite fibers that were subsequently carbothermally reduced to ceramics via pyrolysis in argon at 1560 °C. While SiC fibers from either composite fibers contained polycrystalline cubic SiC (β-SiC) structure, their fiber morphologies and atomic compositions differed due to the distinct thermal behaviors and decomposition pathways of PMMA and PS. Pyrolysis at 1000 °C produced fibrous mats of amorphous SiCO from PUS/PMMA with high O (32.5%) content or from PUS/PS with high C (74.7%) content. These differences led to distinct SiC fiber morphologies from further pyrolysis at 1560 °C, i.e., an interconnected fibrous mat of nanoparticle-filled porous core and wrinkled sheath fibers from PUS/PS and fragmented nanoparticle-filled porous fibers intermixed with abundant 100 nm diameter nanowires with straight, beaded and bamboo-like morphologies from PUS/PMMA.

Original languageEnglish (US)
Pages (from-to)1005-1012
Number of pages8
JournalJournal of Materials Chemistry
Volume21
Issue number4
DOIs
StatePublished - Jan 28 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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