Recently, researchers at the University of Manchester have proposed a low-cost method for producing graphene printed electronic products, which can greatly improve the production efficiency and reduce the cost of conductive graphene inks.
Graphene inks are dispersions of graphene flakes in a solvent that can be easily patterned by spray coating, screen printing, ink jet printing, and knife coating techniques. In the field of printed antennas, spraying is a less reported method due to the lack of flatness of the film. The inkjet printing method is complementary to the blade coating method, the former having higher precision and higher cost, and the latter being the opposite. In addition, inkjet printing requires multiple printings to achieve low sheet resistance, which takes more time and is not feasible for mass production. Screen printing technology is the best choice for industrial scale production of conductive inks, taking into account factors such as cost, printing accuracy and surface conductivity. However, it has rarely been reported that antennas for the production of graphene by screen printing have been reported, since most of the current methods for preparing graphene inks must use organic solvents such as N-methyl-2-pyrrolidone (NMP) and dimethyl. Carboxamide (DMF). They are toxic and produce low ink concentrations that are unsustainable and cannot be used for industrial scale production.
To this end, the team used a cellulose-derived solvent, Cirene, as a solvent in liquid-phase stripped graphene preparation inks, which is not only non-toxic, environmentally friendly and sustainable, but also provides more High concentration of graphene inks, which significantly reduces the cost of large-scale production. In this work, a low-cost, environmentally-friendly and sustainable high-conductivity graphene ink (10 mg mL -1 ) was developed and further concentrated to 70 mg mL -1 for screen printing.
As a key application demonstration, this paper describes a printed graphene-free wireless battery-free body temperature sensor, RFID tag, and RF energy harvesting system for powering battery-free devices capable of sensing resistive and capacitive sensors, illustrating low cost, screen The potential of printed graphene wearables in IoT applications, such as healthcare and health monitoring, also reflects sustainability and disposition, all of which are key factors in entering the mass production market.
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