Nanocellulose for conductive ink preparation

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Fanny Hoeng defended her University Grenoble Alpes doctoral thesis (specialty : Materials, Mechanical, Civil Engineering, Electrochemistry) prepared under the supervision of Julien Bras, Associate Professor, and the co-supervision of Aurore Denneulin, Associate Professor (LGP2, Grenoble INP-Pagora). She presented the results of her research work entitled Potential of nanocellulose for conductive ink preparation.

This thesis CIFRE, realized in association with the company Poly-Ink, aims at developing new conductive inks based on nanocellulose and silver nanowires for transparent and conductive applications. Nanocellulose are nanoparticles extracted from the cellulose and two kinds currently exist : the cellulose nanocrystals (CNC) and the cellulose nanofibrils (CNF).

This project have evaluated on one hand the ability of using tubular rigid CNC as template for producing silver nanorods, prior their formulation into conductive inks. On the other hand, the ability of using flexible and entangled CNF to stabilize commercial silver nanowires, usually unstable in suspension, was investigated.

The results of this project lead to the patented formulation and commercialization of one low silver content conductive ink based on silver and CNC and two conductive transparent ink based on CNF and silver nanowires. Physico-chemical interactions and colloidal stability of such hybrid suspension have been scientifically studied meanwhile printing process adapted formulation have been successfully designed and tested at laboratory scale but also industrial scale.

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