Flexible and conductive graphene-poly (diallyldimethylammoniumchloride) buckypaper

Xueqiu You, James Jungho Pak

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper describes the fabrication and characterization of flexible, conductive reduced graphene oxide (rGO)-poly(diallyldimethylammoniumchloride) (PDDA) buckypaper (BP). PDDA acts as a reducing agent to prepare an rGO-PDDA nanosheet dispersion from graphite oxide. The incorporation of PDDA as a "glue" molecule successfully binds rGO nanosheets into BPs with strong interlayer binding. The resulting BPs were characterized by scanning electronic microscopy (SEM), Raman, energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and resistivity measurements. The sp2 structure was greatly restored by the PDDA-induced reduction. Moreover, rGO was chemically doped from the adsorbed PDDA, which causes the Raman G band to shift from ∼1585 to ∼1610 cm-1. This chemical doping substantially increased the density of the free charge carriers in rGO and thereby further enhanced the electrical conductivity of the rGO-BP. Good interlayer connection in the rGO percolating network was obtained after thermal annealing at higher than ∼250 °C. The resulting rGO-PDDA-BPs exhibited an isotropic sheet resistance as low as ∼100 ω;/sq, which indicates a reduction by six orders of magnitude compared to the GO-BPs resistance before annealing. This PDDA-induced reduction with a low-temperature annealing process preserved the BPs' structural integrity and mechanical flexibility, thus overcoming the fragility problems with high-temperature annealing.

Original languageEnglish
Pages (from-to)2001-2008
Number of pages8
JournalJournal of Nanoscience and Nanotechnology
Volume15
Issue number3
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Conductive
  • Flexible
  • Graphene-PDDA buckypaper
  • Low-temperature annealing

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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