Anisotropic flexible transparent films from remaining wood microstructures for screen protection and AgNW conductive substrate

Abstract

Flexible transparent conductive films or substrates prepared from plastics or cellulose are widely used in optoelectronic devices. However, all of these films or substrates are fabricated by complex and expensive methods, which consume much energy and time. In this work, we report for the first time a remarkably facile and effective approach for fabricating flexible transparent films directly from wood. The resulting films exhibit an array of exceptional optical and mechanical properties. The well-aligned cell structures in natural wood are maintained during delignification, leading to anisotropic films with high transparency (≈90% transmittance). These anisotropic films with well-aligned cell structures show mechanical tensile strengths higher than those of the original wood, and can be used as screen protection films for cellphones. Furthermore, ultrathin, highly transparent, and outstandingly conductive films have been prepared from such films and silver nanowires (AgNWs) using the Meyer technique. A conductive film with an optimal area density (341 mg m) of AgNWs showed outstanding synergistic properties, with a transmittance of 80% and a sheet resistance of 11 Ω sq, equal to the conductivity of ITO. Of importance here is that the low-cost anisotropic transparent wood film shows promising potential for electronics applications in solar cells, flexible displays, and other products.

Eco-friendly transparent poplar-based composites that are stable and flexible at high temperature

“…The interface is critical for optical transmittance of TWC. 29,30 The interfacial space of TPC could be increased in a reasonable range by removing lignin, improving the limited swelling of cellulose ber network and inltrating with PU. Between the cellulose ber network of the poplar-polymer composite, the interfacial space linking lumen is also the light pathway for optical transmittance.…”

2D double aeolotropic conductive Janus pellicle with multi-functionality then derived 3D dual-wall Janus-type tube

“…There have been several types of ACFs reported. The films that conduct electricity along the thickness direction of the film are known as type I ACFs [24], and films that conduct in two perpendicular directions on the surface are defined as type II ACFs [25]. Based on the reports, the type II aeolotropic conductive materials are still in the stage of laboratory exploration.…”

Cellulose transparent conductive film and its feasible use in perovskite solar cells

“…17,21,22 There is little done in the area of transparent conductive regenerated cellulose lm; to the best of our knowledge, the thin lm prepared from bacterial cellulose/AgNWs composite exhibited an acceptable transparency $80% and a good conductivity 7.46 U , À1 ; 23 while the transparent lms from remaining wood microstructures and AgNW showed a slight lower transparency $75% and a good conductivity 11 U , À1 . 24 In this work, regenerated cellulose lm was prepared from cellulose dissolution in ionic liquid and regeneration from a water bath. A modied polyol synthesis method was adopted to grow AgNW on the AgCl core with a controlled size.…”