Abstract
Optically transparent nanofiber paper containing silver nanowires showed high electrical conductivity and maintained the high transparency, and low weight of the original transparent nanofiber paper. We demonstrated some procedures of optically transparent and electrically conductive cellulose nanofiber paper for lightweight and portable electronic devices. The nanofiber paper enhanced high conductivity without any post treatments such as heating or mechanical pressing, when cellulose nanofiber dispersions were dropped on a silver nanowire thin layer. The transparent conductive nanofiber paper showed high electrical durability in repeated folding tests, due to dual advantages of the hydrophilic affinity between cellulose and silver nanowires, and the entanglement between cellulose nanofibers and silver nanowires. Their optical transparency and electrical conductivity were as high as those of ITO glass. Therefore, using this conductive transparent paper, organic solar cells were produced that achieved a power conversion of 3.2%, which was as high as that of ITO-based solar cells.
Highlights
Transparent nanofiber paper containing silver nanowires showed high electrical conductivity and maintained the high transparency, and low weight of the original transparent nanofiber paper
We demonstrated some procedures of optically transparent and electrically conductive cellulose nanofiber paper for lightweight and portable electronic devices
Experimental Cellulose nanofibers and silver nanowires. 15-nm-wide cellulose nanofibers were mechanically nanofibrillated from wood pulps of Sitka spruce (Picea sitchensis), using a high-pressure water jet system (Star Burst, HJP-25005E, Sugino Machine Co., Ltd.)5,18. 0.7 wt.% cellulose nanofiber/water dispersions were used as starting materials for the optically transparent nanofiber sheets
Summary
Present electronic devices are heavy, and cannot be folded, because of the heavy and brittle nature of ITO glasses To overcome these disadvantages, transparent conductive plastic substrates have been developed using carbon nanotubes, silver nanowires, or graphene instead of doped metallic oxides[1,2,3,4]. Transparent and electrically conductive nanofiber paper was fabricated using the three methods of heating, mechanical pressing, and deposition via dropping (Fig. 1d). (2) Mechanical pressing method (Fig. 1d): A 0.3 wt.% silver nanowire/ethanol suspension was bar-coated onto the transparent nanofiber papers, and was air-dried for 3–5 min. Transparent and electrically conductive nanofiber papers were fabricated with silver nanowires using a pressing method. The sheet resistance was measured using the four-point probe method (MCP-T610 Loresta type, Mitsubishi Chemical Analytech Co., Ltd.)
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