Transparent Electrode and Magnetic Permalloy Made from Novel Nanopaper

Abstract

We report a novel partial dissolution strategy to liberate uniform cellulose nanofibers with diameter of 5-10 nm from macroscopic cellulose fibers and promote separation of nanofibers in an aqueous environment by forming water-soluble sodium carboxymethylcellulose (CMC) through heterogeneous sodium acetoxylation of cellulose. With the obtained cellulose nanofibers, we fabricated nanopapers which exhibit high optical transparency of 90.5% (@550 nm) with promising mechanical properties and high thermal stability. By directly depositing Ag nanowires on a wet nanofiber sheet, we fabricated a flexible transparent electrode with 86.5% (@550 nm) transparency and 26.2 Ω/sq sheet resistance (R). Meanwhile, we studied the magnetic properties of sputter deposited thin film of permalloy on nanopaper which exhibited a similar magnetic coercivity and a close saturation magnetization to conventional silicon dioxide-based permalloy.

Recent Strategies in Preparation of Cellulose Nanocrystals and Cellulose Nanofibrils Derived from Raw Cellulose Materials

“…The resultant CNFs had acylindrical cross section with the width of 5-15 nm and the length of ca. 1 m. Chen et al reported the preparation of CNFs by high pressure homogenization of carboxymethylated cellulose raw fibers [88]. In this work, the carboxymethylation pretreatment included two steps: (1) basification of raw oven-dried cellulose fibers by using anhydrous NaOH/dimethyl sulfoxide; (2) further sodium acetoxylation of cellulose raw fibers by using sodium chloroacetate.…”

Rapid ILs-polishing Processes Toward Flexible Nanostructured Paper with Dually High Transparency and Haze

“…4c ). The optical transparency of the nanostructured nanopaper is much higher than those surface partly dissolved paper with the highest transparency of ~76% (800 nm), and maintains the equivalent level compared to the nanopaper 5 , 24 , 25 made of the chemically separated cellulose nanofibers. More importantly, the nanostructured paper also has the outstanding optical property of high haze because the partly dissolved cellulose binds individual sheets together while maintains the larger fibrous profiles.…”

Recent Advances on Renewable and Biodegradable Cellulose Nanopaper Substrates for Transparent Light-Harvesting Devices: Interaction with Humid Environment

“…TEMPO-mediated oxidation, a method for producing nanofibres, is the chemical treatment that oxidizes the C 6 carbon of the surface glucopyranosidic groups to -COOH functionalities. Thermogravimetric analyses have been performed on nanopaper and have shown a dramatic decrease of thermal stability in nanopaper prepared from carboxylated nanofibres [25]. This may negatively impact the implementation of nanopaper into device technology, because it can limit the application of annealing processes.…”