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New adhesive tape picks up and sticks down 2D supplies as simply as kid’s play

New adhesive tape picks up and sticks down 2D supplies as simply as kid’s play

2024-02-10 15:26:23

New adhesive tape picks up and sticks down 2D materials as easily as child's play
The newly designed UV tape is ready to switch 2D supplies, together with graphene and transition metallic dichalcogenides, onto a spread of various substrates, together with silicon, ceramic, glass and plastic. Credit score: In the past Lab, Kyushu College

Supplies simply atoms in thickness, generally known as two-dimensional (2D) supplies, are set to revolutionize future expertise, together with within the electronics trade. Nevertheless, commercialization of units that include 2D supplies has confronted challenges as a result of issue in transferring these extraordinarily skinny supplies from the place they’re made onto the machine.

Now, a analysis workforce from Kyushu College, in collaboration with Japanese firm Nitto Denko, have developed a tape that can be utilized to stay 2D materials to many various surfaces, in a straightforward and user-friendly method. The findings had been published in Nature Electronics on Feb. 9, 2024.

“Transferring 2D supplies is usually a really technical and complicated course of; the fabric can simply tear, or turn into contaminated, which considerably degrades its unique properties,” says lead writer, Professor Hiroki In the past of Kyushu College’s World Innovation Middle. “Our tape affords a fast and easy different, and reduces harm.”

The researchers started by specializing in graphene. Constituted of a skinny sheet of carbon atoms, graphene is hard, versatile, and lightweight, with excessive thermal and electrical conductivity. Dubbed a “marvel materials” upon discovery, it has potential functions in biosensing, anti-cancer drug supply, aeronautics and digital units.

Researchers from Kyushu College and Nitto Denko have to date succeeded in transferring wafers of graphene as much as 10 cm in diameter utilizing UV tape. With smaller items of UV tape, the sticking and peeling might be finished by hand. Nevertheless, machines are helpful when scaling up for mass manufacturing. Credit score: Nakatani et al. Nature Electronics

“One of many fundamental strategies of constructing graphene is thru chemical vapor deposition, the place graphene is grown on copper movie. However to carry out correctly, the graphene have to be separated from the copper and transferred onto an insulating substrate, like silicon,” Professor In the past explains.

“To do that, a protecting polymer is positioned over the graphene, and the copper is then eliminated utilizing etching answer, similar to acid. As soon as hooked up to the brand new substrate, the protecting polymer layer is then dissolved with a solvent. This course of is dear, time-consuming and may trigger defects to the graphene’s floor or go away traces of the polymer behind.”

Professor In the past and his colleagues subsequently aimed to offer an alternate method of transferring graphene. They used AI to develop a specialised polymer tape, dubbed “UV tape,” which adjustments its attraction to graphene when irradiated with UV mild.

New adhesive tape picks up and sticks down 2D materials as easily as child's play
Researchers from Kyushu College and Nitto Denko have developed tape that adjustments its ‘stickiness’ to 2D supplies resulting from UV mild. Credit score: In the past Lab, Kyushu College

Earlier than publicity to UV mild, the tape has a robust adhesion to graphene, permitting it to “stick.” However after UV publicity, the atom bonding adjustments, which decreases the extent of adhesion to graphene by about 10%. The UV tape additionally turns into barely stiffer and simpler to peel off. Taken collectively, these adjustments permit the tape to be peeled off the machine substrate whereas leaving the graphene behind.

The researchers additionally developed tapes that may switch two different 2D supplies: white graphene (hBN), an insulator that may act as a protective layer when stacking 2D supplies, and transition metal dichalcogenides (TMDs), a promising materials for the subsequent era of semiconductors.

Importantly, when the researchers regarded intently on the floor of the 2D supplies after switch, they noticed a smoother floor with fewer defects than when transferred utilizing the present standard method. Upon testing the supplies’ properties, in addition they discovered that they had been extra environment friendly.

Switch utilizing UV tape additionally affords quite a few different benefits over present switch methods. As a result of the UV tape is flexible, and the switch course of does not require the usage of plastic-dissolving solvents, versatile plastics can be utilized because the substrate of the machine, increasing potential functions.

“For instance, we made a plastic machine that makes use of graphene as a terahertz sensor. Like X-rays, terahertz radiation can go by means of objects that mild cannot, however does not harm the physique,” Professor In the past says. “It’s extremely promising for medical imaging or airport safety.”

New adhesive tape picks up and sticks down 2D materials as easily as child's play
Researchers from Kyushu College confirmed that utilizing UV tape to switch graphene as an alternative of polymer higher maintained the fabric’s integrity and lowered defects. Credit score: In the past Lab, Kyushu College

What’s extra, the UV tape might be lower to dimension in order that solely the precise quantity of 2D materials wanted is transferred, minimizing waste and lowering value. 2D layers of various supplies may also be simply laid on high of one another in several orientations, permitting researchers to discover new rising properties from the stacked supplies.

For his or her subsequent steps, the researchers are aiming to broaden the dimensions of the UV tape to the dimensions wanted for producers. At present, the most important wafer of graphene that may be transferred is 10 cm in diameter. Professor In the past and his colleagues are additionally attempting to resolve the issue of wrinkles and bubbles that kind on tape, inflicting small defects.

The analysis workforce additionally hopes to enhance stability, in order that 2D supplies might be hooked up to UV tapes for an extended time period, and distributed to finish customers, similar to different scientists.

“The tip customers can then switch the fabric onto their desired substrate by making use of and eradicating the UV tape like a toddler’s sticker, with no coaching wanted,” says Professor In the past. “Such a straightforward methodology might essentially change the model of analysis and speed up the industrial improvement of 2D supplies.”

See Also

Extra info:
Prepared-to-transfer two-dimensional supplies utilizing tunable adhesive power tapes, Nature Electronics (2024). DOI: 10.1038/s41928-024-01121-3

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Kyushu University

New adhesive tape picks up and sticks down 2D supplies as simply as kid’s play (2024, February 9)
retrieved 10 February 2024

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