Abstract
The development of next generation of flexible electronic devices requires new materials to replace the glass as transparent windows. Here, flexible, transparent, and very strong cross-linked celluloses have been prepared by cross-linking free cellulose chains with epichlorohydrin (ECH) in its aqueous solution. Atomic force microscopy (AFM), light transmittance, differential thermogravimetric (DTG) thermal analyses, and tensile tests revealed that the as-prepared films are a thickness of about 10 μm with highly optical transparency and mechanical strength. The film also showed a low coefficient of thermal expansion (CTE) of about 6.9 ppm/K, which is superior to that of glass. Then the as-prepared cellulose film was combined with a dried foam ultrathin film of reduced graphene oxide to prepare a new, flexible, transparent, very strong, and electrically conductive thin film.
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