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Cellulose Nanopaper with Monolithically Integrated Conductive Micropatterns
Author(s) -
Hajian Alireza,
Wang Zhen,
Berglund Lars A.,
Hamedi Mahiar M.
Publication year - 2019
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201800924
Subject(s) - materials science , nanocellulose , electrical conductor , substrate (aquarium) , nanotechnology , carbon nanotube , cellulose , conductive ink , composite material , chemical engineering , layer (electronics) , sheet resistance , oceanography , engineering , geology
This work presents a route to fabricate micropatterned conductive structures where the conductors are monolithically integrated with nanocellulose‐based paper. To fabricate conductive features, microstructures are patterned on filter papers using wax‐printing, followed by vacuum filtration of carbon nanotubes (CNTs) or silver nanowires (AgNWs) dispersed in aqueous cellulose nanofibrils (CNFs). These patterns are then laminated onto a pure CNF substrate (both in gel‐state) and dried to form cellulose nanopapers with integrated conductive micropatterns. Resolutions of the conductive features are shown down to 400 µm wide, 250 nm thick, and with conductivity values of 115 ± 5 S cm −1 for the CNF–CNT and 3770 ± 230 S cm −1 for the CNF–AgNW micropatterns. The nanopaper and the conductive patterns both constitute random fibrous networks, and they display similar ductility and swelling behavior in water. Thus, the integrated conductive micropatterns can withstand folding, as well as wetting cycles. This stability of the micropatterns makes them useful in various devices based on nanocellulose substrates. As an example, an electroanalytical nanopaper device that operates in wet conditions is demonstrated.