Cellulose Nanopaper with Monolithically Integrated Conductive Micropatterns. (18th January 2019)

• Record Type: Journal Article
• Authors: Hajian, Alireza; Wang, Zhen; Berglund, Lars A.; Hamedi, Mahiar M.
• Is Part Of: Advanced Electronic Materials. Volume 5:Number 3(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-01-18
• Subjects: carbon nanotubes -- nanocelluloses -- nanopapers -- nanowires -- printed electronics; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.201800924
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: 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. Abstract : This work shows a route to fabricate functional patterns that are integrated and embedded in the bulk of the cellulose nanopaper (substrate) having a flat surface irrespective of the pattern thickness. The patterns and the substrate are cofabricated using the same process and in the gel state. The patterned structures can withstand folding cycles and operate in wet conditions.