Nanocellulose is a promising material for producing biocomposites due to its mechanical properties. By decorating nanocellulose surface with conducting polymers a new generation of materials with a wide range of applications can be obtained. Among those polymers, Polypyrrole (PPy) is especially promising for commercial applications due to its facile synthesis, high conductivity, and biodegradability. In this work, we show how conductive cellulose-based nanopapers can be obtained. Three different kinds of highly oxidized cellulose nanofibers (CNF) are involved in the chemical polymerization induced adsorption process of PPy on the surfaces of oxidized CNFs in aqueous media. Resulting CFN/PPy nanocomposite was evaluated by X-ray photoelectron spectroscopy (XPS), Fourier transformed infrared (FTIR) spectroscopy, scanning and transmission electron microscopy (SEM and TEM respectively), thermogravimetric analysis (TGA), Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy.  Morphological characterization clearly shows the formation of core-shell structures in which PPy nanoparticles are covering the CNF’s surface. The resulting CNF/PPy nanocomposites presented diameter sizes in the range of 70 – 90 nm, which are relatively higher in comparison to the initial CNF’s diameters.  XPS analysis shows a centered N1s peak at 399.1 eV indicating a successful integration of PPy in the CNF structure. FTIR spectra show signals around 3350 cm<sup>-1</sup> and 1600 cm<sup>-1</sup> which indicate that CNF has changed into CNF/PPy nanocomposite. Moreover, electrochemical characterization indicates that the composite fabricated exhibits excellent electrical conductivity in comparison to uncoated CNF or pure PPy. The resulted CNF/PPy nanocomposite synergistically combines the electronic characteristics of conducting polymers with the structural advantages of bio-based cellulose polymers. This nanocomposite is being explored as a matrix for the chemical and electrochemical deposition of metal nanoparticles. Finally, in this work, we show that these nanocomposites are useful for developing biosensing devices.

Conducting cellulose nanopapers as platform for sensing applications

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.