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Synthesis, characterization, and multilayer assembly of pH sensitive graphene−polymer nanocomposites
journal contribution
posted on 2010-04-17, 00:00 authored by J Liu, L Tao, Wenrong YangWenrong Yang, D Li, C Boyer, R Wuhrer, F Braet, T DavispH sensitive graphene−polymer composites have been prepared by the modification of graphene basal planes with pyrene-terminated poly(2-N,N′-(dimethyl amino ethyl acrylate) (PDMAEA) and poly(acrylic acid) (PAA) via π−π stacking. The pyrene-terminal PDMAEA and PAA were synthesized using reversible addition−fragmentation chain transfer (RAFT) polymerization with a pyrene-functional RAFT agent. The graphene−polymer composites were found to demonstrate phase transfer behavior between aqueous and organic media at different pH values. Atomic force microscopy (AFM) analysis revealed that the thicknesses of the graphene−polymer sheets were approximately 3.0 nm when prepared using PDMAEA (Mn: 6800 and PDI: 1.12). The surface coverage of polymer chains on the graphene basal plane was calculated to be 5.3 × 10−11 mol cm−2 for PDMAEA and 1.3 × 10−10 mol cm−2 for PAA. The graphene−polymer composites were successfully characterized using X-ray photoelectron spectroscopy (XPS), attenuated total reflection infrared (ATR-IR) spectroscopy, and thermogravimetric analysis (TGA). Self-assembly of the two oppositely charged graphene−polymer composites afforded layer-by-layer (LbL) structures as evidenced by high-resolution scanning electron microscopy (SEM) and quartz crystal microbalance (QCM) measurements.
History
Journal
LangmuirVolume
26Issue
12Pagination
10068 - 10075Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
ISSN
0743-7463eISSN
1520-5827Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2010, American Chemical SocietyUsage metrics
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