![]() ![]() Natural materials have advantages of rich content and good biocompatibility, so their assisted dispersed inks have great potential in fabricating wearable electronic devices. Therefore, natural macromolecules have great potential in the field of CNT dispersions. The aforementioned natural materials can increase the dispersion ability of CNTs in water due to the interactions of π– π interactions and/or hydrophobic interactions. prepared a single-walled carbon nanotube ink highly dispersed by sulfated nanocellulose, and the dispersion limit reached 80 wt%. designed a green way to prepare highly stable and biocompatible CNT conductive ink mediated by sericin, which also has excellent conductivity. developed MWCNT-based conductive ink with highly dispersed mediated by carboxymethyl xylan hydrate crystals, which have excellent conductivity. prepared a water-based composite ink with excellent stability by using carboxylated nanocellulose as a dispersant of MWCNT, which significantly improved the thermoelectric conversion efficiency of the coating. To improve the biocompatibility of CNT, many natural biological polysaccharides and proteins have been used to disperse CNT via noncovalent interactions. What's more, these methods harm the biocompatibility of the obtained CNT-based ink. However, the surface structure of CNT may be damaged by these treatments, and the conductivity becomes deterioration. Chemical modification and surfactant have been widely used to change the surface characteristics of CNT, thus improving the dispersibility of CNT in water. Many methods have been developed to solve the aggregation problem of CNT dispersion in water. Unfortunately, the intrinsic strong π– π interaction among the tubes makes it easy to self-aggregate in water, which greatly affects the uniformity, shelf-life, and processability of CNT-based conductive ink. However, MWCNT is cheaper, more convenient to produce, more flexible, and better controlled in shape, which makes it easier to realize mass production. It is due to the single-walled CNT having higher uniformity and conductivity. A majority of the researches on conductive ink were focused on single-walled carbon nanotubes, while there are few reports on multiwall CNT (MWCNT). Among them, CNT is considered an ideal candidate material for high-quality conductive ink, which has unique electrical and thermal characteristics, high stability, and low density. The conductive solid particles in ink mainly include metal materials (metal nanoparticles and nanowires) and carbon-based materials (conductive carbon black, carbon nanotube (CNT), graphene, and carbon quantum dots). With the rapid development of wearable electronics and bioelectronics, and the enhancement of environmental protection concepts, water-based conductive “green” ink with proper rheology and good biocompatibility has gradually become the research focus. Generally, the conductive ink should meet the requirements of good conductivity, processability, stability, printability, adhesion, and bending resistance of the printed coating. The selection of conductive ink is the key part of flexible electronics' product characteristics. This work puts forward a strategy of green preparation of MWCNT-based ink by adding renewable chitin, which opens up a new way to apply MWCNT-based ink in self-powering wearable multifunctional sensors.Ĭonductive inks can conveniently fabricate multifunctional electronic devices by the printing process, such as printing sensors, generators, energy storage devices, and various flexible wearable electronic products. Moreover, CCNT coated paper has no cytotoxicity by CCK-8 and live/dead staining. The CCNT coated paper-based TEG can convert thermal voltage signals into musical notes, monitor the changes in human behavior and respiratory rate, and monitor joint movements. With good thermoelectric and strain sensing properties, CCNT coated paper can stably collect human energy at room temperature to realize self-powering. Using CCNT ink, a paper-based thermoelectric generator (TEG) is manufactured by screen-printing technology. ChNCs/MWCNT (CCNT) ink does not aggregate even after standing for 3 months with a maximum MWCNT concentration of 33 mg mL −1 and dispersion efficiency of 91.1%. ChNCs can interact with MWCNT in noncovalent ways, including π– π and hydrophobic interactions. Herein, chitin nanocrystals (ChNCs) are used as a dispersant for the preparation of multiwalled carbon nanotube (MWCNT) ink with high viscosity and uniformity by ultrasound treatment. The screen-printing process of conductive ink can realize simple and large-scale manufacture of micro/nano patterns for producing wearable electronic products. ![]()
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