Hive‐Inspired Multifunctional Wood‐Nanotechnology‐Derived Membranes with a Double‐Layer Conductive Network Structure for Flexible Electronics

Abstract

nology has made great progress. Lai and his co-workers prepared transparent films for optoelectronic devices and energy storage devices by screen printing technology. [2][3][4] Chen et al. prepared a flexible micro supercapacitor by the combination of electrochemical deposition and inkjet printing. [5] Liu et al. proposed a new type of polyol process for the synthesis of ultralong silver nanowires (Ag NWs). The prepared flexible all solid state supercapacitor based on the obtained Ag NW transparent film shows excellent electrochemical properties. [6] Chen et al. used the improved p o l y ( 3 , 4 -e t h y l e n e d i o x y t h i o p h e n e )poly(styrenesulfonate) (PEDOT:PSS) inkjet to print on the exquisite silver (Ag) grid. The prepared PEDOT:PSS/Ag grids hybrid electrodes exhibited excellent optoelectronic performance. [7] Portability, flexibility, and mechanical durability are the most focused and most popular research directions of flexible electronics, which are also relatively easy to implement. [8] Some special functions, such as recyclability, self-healing, and versatility, have been gradually added or integrated to improve the comprehensive performance of flexible electronics. [9] Although these aspects have been continuously optimized and improved, the comfort, safety, and health of flexible electronics are always neglected, which hinders their practical applications to a great extent. [10] Therefore, next generation flexible electronics must achieve multifunctionality, degradability, and antibacterial activity, while reducing cost and environmental impact. Electronic products may become electronic waste and pollute the environment at the end of their service life. [11] Traditional polymer substrates have excellent mechanical strength, but most of them come from petroleum resources. [12] Typical plastic materials, such as polyethylene naphthalate, poly imide, and polyethylene terephthalate, have been widely used as matrix materials. However, they are non-renewable and non-biodegradable, which hinders their application in the biological field and causes environmental pollution. [13] Therefore, the development of environment-friendly flexible device substrate materials is a very promising but challenging topic. Next-generation flexible electronics must achieve multifunctionality, environmental friendliness and antibacterial activity. Accordingly, organisms in nature are interconnected. Inspired by the honeycomb multilayer porous structure, a wood-nanotechnology-derived flexible membrane circuit is created to meet the abovementioned requirements. The flexible wood (FW) matrix is made of natural balsa wood that underwent a simple top-down chemical treatment. The multiwalled carbon nanotube (MWCNT) acts as a "bridge" between the FW matrix with a porous array structure and the active material (silver nanoparticles (Ag NPs) and poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOT:PSS). Due to the three-dimensional porous microstructure and highly conductive surface inherited by the wood-nanotechnolog...

Recent progress in the development of smart supercapacitors

“…(F) FW/MWCNT/Ag/PEDOT: Schematic diagram of the electrochemical properties of PSS electrodes. Reproduced with permission: Copyright 2022, Wiley‐VCH 123 …”

“…On the whole, this work brings forward a new view of functional MSCs with EMI shielding for special applications on chips in microelectronics, which is of great significance to the stability of integrated circuits and microsystems. Furthermore, extending the synergistic properties of MXene nanosheets to microporous aerogels requires effective 123 strategies to overcome the restacking of nanosheets without damaging the excellent performance of MXenes. The traditional assembly method of 3D MXene aeroneneneba gel usually involves an external adhesive/ template and/or additional functionalization, which sacrifices the conductivity and electrochemical activity of MXene aeroneneneba gel.…”

“…Inspired by the honeycomb multilayer porous structure, a flexible membrane circuit derived from wood nanotechnology was created to meet the above requirements. Zhang et al 123 prepared flexible wood (FW)/MWCNT/ Ag/PEDOT:PSS composites with porous structures by soaking deligized wood (Figure 13E). As shown in Figure 13F, owing to the porous structure and synergy of multi-component active materials, the FW/MWCNT/ Ag/PEDOT:PSS electrode enables rapid transport of electrolyte ions inside it, achieving an area capacitance of 266.7 mF/cm 2 (20 mV/s).…”

Polyvinyl alcohol/propylene glycol facilitates reversible thermochromism of passive energy-saving flexible wood films at low (brightness) to high (depth) temperatures

“…20 With the development needs of flexible electronic devices, wearable devices and smart homes, flexible PCMs with excellent mechanical properties have become a research hotspot. 21–26…”

“…20 With the development needs of exible electronic devices, wearable devices and smart homes, exible PCMs with excellent mechanical properties have become a research hotspot. [21][22][23][24][25][26] Reversible thermochromic materials label surface temperature changes and temperature distribution through color memory, and are generally composed of couplers, developers, and co-solvents (fatty alcohols, fatty acids, etc). [27][28][29] PCMs can not only contribute to phase change energy storage, but also participate in thermochromic processes as co-solvents.…”