Abstract
The feasibility and effectiveness of the electrostatic self-assembly technique are demonstrated for the fabrication of thermoplastically conducting multilayer films. The layer-by-layer self-assembly process is based on the alternating adsorption of low molecular weight (M n) poly(acrylic acid) (PAA) and cetyltrimethyl-ammonium bromide-modified graphene oxide (GO) with three carbon layers. A unique conductivity percolation effect is observed at a percolation threshold (percolation bilayer number) because the carbon–carbon interlayer can be expanded by the diffusion of PAA molecular chains. The resultant multilayer films show typical positive/negative temperature coefficient effects because of the thermoplasticity of the PAA with low M n. After being reduced from GO to graphene (G), the electrical conductivity of the resulting (PAA/G)n multilayer film is dramatically enhanced, and the percolation threshold occurs at a high bilayer number. The reasonable conductivities and the percolation effect make these films inherently interesting and potentially useful as components of advanced electronic devices.
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The authors gratefully acknowledge the Ocean University of China for providing Seed Fund to this project.
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Tang, Q., Cai, H., Yuan, S. et al. Percolation effect and thermoplasticity of conducting [poly(acrylic acid)/C16TAB-modified graphene oxide]n multilayer films. J Mater Sci 48, 1843–1851 (2013). https://doi.org/10.1007/s10853-012-6950-9
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DOI: https://doi.org/10.1007/s10853-012-6950-9