Electro-conductive cellulosic paper has attracted great attention as a promising alternative material in the emerging field of flexible and portable electronic devices. However, the environmentally friendly fabrication of electro-conductive cellulosic paper still remains challenging. Herein, green multiwalled carbon nanotube (MWCNT)/graphene oxide (GO) nanocomposites towards the sustainable development strategy were developed and subsequently used to impart electro-conductivity to cellulosic paper via surface coating process. GO exfoliated from graphite powder was used as a dispersant to improve the dispersion of MWCNTs in water media, and nanocrystalline cellulose (NCC) derived from cotton fibers was employed as a binder for the MWCNT/GO nanocomposites. Effect of NCC amount on the rheological behavior, particle size distribution, sedimentation stability and zeta potential of MWCNT/GO nanocomposites as well as the electro-conductivity and mechanical properties of coated paper was investigated. Results demonstrated that NCC enhanced the dispersion of MWCNT/GO nanocomposites in addition to serving as a binder. Surface coating application of MWCNT/GO nanocomposites was found to impart high electro-conductivity of up to 892 S m -1 to the cellulosic paper while improving its mechanical properties.
Cellulosic
paper, when imparted with strong conductivity, may have
important applications. In the present work, graphite-based coatings
were fabricated and directly applied onto the surface of a low-grade
paper made of recycled fibers to produce conductive paper. Sodium
dodecyl sulfate (SDS)-graphite aqueous dispersion was developed, in
order to attain the graphite suspensions with high solid content and
good dispersion. A coating formula consisting of graphite suspensions,
styrene butadiene (SB) latex, and other ingredients was investigated
to impart high conductivity to cellulosic paper. Effects of graphite
dispersion on the coating viscosity and conductivity of surface coated
paper were studied, and the microstructure of surface coated paper
was characterized. Results showed that the optimum SDS addition promoted
the graphite dispersion, decreased the coating viscosity, and facilitated
the formation of uniform and compact coating network structures, all
of which contributed to the increased coating layer density, decreased
air permeability, and enhanced conductivity.
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