Nanoscale electromechanical properties of template-assisted hierarchical self-assembled cellulose nanofibers.
Royal Society of Chemistry (RSC)
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Calahorra, Y., Datta, A., Famelton, J., Kam, D., Shoseyov, O., & Kar-Narayan, S. (2018). Nanoscale electromechanical properties of template-assisted hierarchical self-assembled cellulose nanofibers.. Nanoscale, 10 (35), 16812-16821. https://doi.org/10.1039/c8nr04967j
Cellulose, a major constituent of our natural environment and a structured biodegradable biopolymer, has been shown to exhibit shear piezoelectricity with potential applications in energy harvesters, biomedical sensors, electro-active displays and actuators. In this regard, a high-aspect ratio nanofiber geometry is particularly attractive as flexing or bending will likely produce a larger piezoelectric response as compared to axial deformation in this material. Here we report self-assembled cellulose nanofibers (SA-CNFs) fabricated using a template-wetting process, whereby parent cellulose nanocrystals (CNCs) introduced into a nanoporous template assemble to form rod-like cellulose clusters, which then assemble into SA-CNFs. Annealed SA-CNFs were found to exhibit an anisotropic shear piezoelectric response as directly measured using non-destructive piezo-response force microscopy (ND-PFM). We interpret these results in light of the distinct hierarchical structure in our template-grown SA-CNFs as revealed by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (TEM).
Is supplemented by: https://doi.org/10.17863/CAM.25763
European Research Council (639526)
External DOI: https://doi.org/10.1039/c8nr04967j
This record's URL: https://www.repository.cam.ac.uk/handle/1810/282967
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/