DWCNT-doped silica gel exhibiting both ionic and electronic conductivities

Benjamin Le Ouay, Stéphanie Lau-Truong, Emmanuel Flahaut, Roberta Brayner, Jean Aubard, Thibaud Coradin, Christel Laberty-Robert

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Silica gels doped with double-walled carbon nanotubes (DWCNTs) were prepared using an aqueous sol-gel route in mild conditions (neutral pH, room temperature). The wet gels exhibited both ionic and electronic conduction. Electrochemical impedance spectroscopy was used to study these two different conduction pathways that prevail at different characteristic time scales. The ionic conduction in the silica network was found to be independent of the DWCNT-doping rate. The electronic conduction through the DWCNT network was found to occur above a critical concentration (0.175 wt %) corresponding to nanotube percolation threshold. The highest content in DWCNTs (0.8 wt %) exhibited a conductivity of 0.05 S/m. Furthermore, the DWCNTs network was found to evolve even after the macroscopic solidification of the gel, suggesting a reorganization of the DWCNTs at the molecular level. This phenomenon could be attributed to the polarization effect of the electrode and was confirmed by Raman spectroscopy studies. Such materials can be useful for the design of sensors incorporating electroactive chemical or biological species.

Original languageEnglish
Pages (from-to)11306-11314
Number of pages9
JournalJournal of Physical Chemistry C
Volume116
Issue number20
DOIs
Publication statusPublished - May 24 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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