Constructing flexible cellulose-Cu nanocomposite film through in situ coating with highly single-side conductive performance

In this work, regenerated cellulose (RC)-Cu nanocomposite films with interesting single-side conductive properties were prepared using in situ coating. The structure and morphology of the films were investigated with XRD, ATR-FTIR, XPS, TG, SEM, TEM and AFM analysis. The mechanical properties and conductive performance of the films were also examined. The copper of a cellulose-cuprammonium solution was employed as the coating source as opposed to the addition of other conductive substances. The single-side coating of Cu nanocomposite film was achieved by one-step reduction based on the asymmetric surface structure of RC film. A layer of Cu nanoparticles with the thickness of similar to 1 mu m was coated on the coagulant-contacting surface. The RC-Cu nanocomposite films displayed high single-sided conductivity (105.6 +/- 63.9 S cm (1)). It was found that the resistance could be tuned by changing the bending curvature. This study provides potential applications in areas such as electronic substrates, wearable electronics and sensors.