Polyaniline nanofiber-silica composite aerogels

Dylan J. Boday, Beatrice Muriithi, Robert J. Stover, Douglas A Loy

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Strong, electrically conducting aerogels were prepared by introducing polyaniline nanofibers to a silica sol just prior to gelation and drying through supercritical carbon dioxide processing. The addition of a few milligrams of polyaniline per cm 3 increased the flexural strength of the cylindrical monoliths by 200%. Using preformed polymeric nanofibers avoided filling of microporosity often observed with polymer reinforcement of aerogels and allowed preparation of polyaniline-silica composite aerogels with surface areas over 900 m 2/g. Despite the small amount of polyaniline nanofibers (1.3-16.5 wt.%), the composite aerogels were electrically conducting (8.0 × 10 - 8-1.83 × 10 - 5 S/cm) and it was possible to prepare chemiresistor sensors for detection of acidic (HCl) and basic (ammonia) gaseous molecules with response times similar to thin film sensors containing orders of magnitude more polyaniline.

Original languageEnglish (US)
Pages (from-to)1575-1580
Number of pages6
JournalJournal of Non-Crystalline Solids
Volume358
Issue number12-13
DOIs
StatePublished - Jul 1 2012

Fingerprint

Aerogels
aerogels
Polyaniline
Nanofibers
Silicon Dioxide
Silica
silicon dioxide
composite materials
Composite materials
conduction
microporosity
flexural strength
sensors
gelation
reinforcement
Microporosity
drying
Sensors
carbon dioxide
ammonia

Keywords

  • Aerogel
  • Composite
  • Polyaniline fibers
  • Strength

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Polyaniline nanofiber-silica composite aerogels. / Boday, Dylan J.; Muriithi, Beatrice; Stover, Robert J.; Loy, Douglas A.

In: Journal of Non-Crystalline Solids, Vol. 358, No. 12-13, 01.07.2012, p. 1575-1580.

Research output: Contribution to journalArticle

Boday, Dylan J. ; Muriithi, Beatrice ; Stover, Robert J. ; Loy, Douglas A. / Polyaniline nanofiber-silica composite aerogels. In: Journal of Non-Crystalline Solids. 2012 ; Vol. 358, No. 12-13. pp. 1575-1580.
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