Nanocomposite Polymeric Materials Based on Eucalyptus Lignoboost((R)) Kraft Lignin for Liquid Sensing Applications


This study reports the synthesis of polyurethane-lignin copolymer blended with carbon multilayer nanotubes to be used in all-solid-state potentiometric chemical sensors. Known applicability of lignin-based polyurethanes doped with carbon nanotubes for chemical sensing was extended to eucalyptus LignoBoost((R)) kraft lignin containing increased amounts of polyphenolic groups from concomitant tannins that were expected to impart specificity and sensitivity to the sensing material. Synthesized polymers were characterized using FT-MIR spectroscopy, electrical impedance spectroscopy, scanning electron microscopy, thermogravimetric analysis, and differential scanning calorimetry and are used for manufacturing of all solid-state potentiometric sensors. Potentiometric sensor with LignoBoost((R)) kraft lignin-based polyurethane membrane displayed theoretical response and high selectivity to Cu (II) ions, as well as long-term stability.



subject category

Materials Science


Goncalves, SSL; Rudnitskaya, A; Sales, AJM; Costa, LMC; Evtuguin, DV

our authors


The funding by FEDER through the COMPETE 2020 Program and National Funds through FCT/MCTES under the projects UID/CTM/50011/2019, UID/AMB/50017/2019, and UID/CTM/50025/2019 is acknowledged. The funding by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of COMPETE 2020 n 246/AXIS II/2017, under the Project Inpactus-innovative products and technologies from eucalyptus, project no. 21874 is acknowledged. AR wishes to acknowledge funding by FCT through CEEC-IND program (CEECIND/01873/2017).

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