Jump to main content
Jump to site search

Issue 10, 2010
Previous Article Next Article

Single-layer graphene nanosheets with controlled grafting of polymer chains

Author affiliations

Abstract

Single-layer graphene nanosheets (SLGNs) are prepared by reduction of well-exfoliated graphite oxide aided by a surfactant (sodium dodecylbenzene sulfonate, SDBS). Grafting density and polystyrene (PS) chain lengths are controlled by modulating the concentrations of diazonium compound and monomer during the grafting reaction of the initiator and the succeeding atomic transfer radical polymerization (ATRP). Atomic force microscopy (AFM), X-ray diffraction (XRD), Raman spectra and transmission electron microscopy (TEM) are used to confirm the single-layer structure of graphene sheets, covalent bonding at the interface, and distribution uniformity of grafting PS chains at the SLGN surface. Thermogravimetric analysis (TGA) is performed to assess the control of grafting density and chain length. PS chains grafted on the SLGN surface exhibited remarkably confined relaxation behavior. An increase in the glass transition temperature (Tg) of up to 18 °C is observed for high grafting density, low molecular weight polymer-grafted graphene samples. The low grafting density, high molecular weight sample shows an increase in Tg of ∼9 °C, which is attributed to superior heat conduction efficiency. The measured thermal conductivity for the PS composite film with 2.0 wt% SLGNs increase by a factor of 2.6 compared to that of the pure PS.

Graphical abstract: Single-layer graphene nanosheets with controlled grafting of polymer chains

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Sep 2009, accepted on 19 Nov 2009 and first published on 21 Jan 2010


Article type: Paper
DOI: 10.1039/B919078C
Citation: J. Mater. Chem., 2010,20, 1982-1992
  •   Request permissions

    Single-layer graphene nanosheets with controlled grafting of polymer chains

    M. Fang, K. Wang, H. Lu, Y. Yang and S. Nutt, J. Mater. Chem., 2010, 20, 1982
    DOI: 10.1039/B919078C

Search articles by author

Spotlight

Advertisements