Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Graphene crystals grow better under copper cover

A schematic illustration of the single-crystal graphene sheets grown on an insulating substrate. The method could enhance next-generation nanomaterial-based devices.

© Springer Nature; Reproduced with permission from Junzhu Li et al (2022).
A schematic illustration of the single-crystal graphene sheets grown on an insulating substrate. The method could enhance next-generation nanomaterial-based devices. © Springer Nature; Reproduced with permission from Junzhu Li et al (2022).

Abstract:
An approach that produces single-crystal graphene sheets on large-scale electrically insulating supports could help with the development of next-generation nanomaterial-based devices, such as very light and thin touchscreens, wearable electronics and solar cells.

Graphene crystals grow better under copper cover

Thuwal, Saudi Arabia | Posted on April 1st, 2022

Most graphene-based electronic devices require insulating supports. Yet, high-quality graphene films destined for industrial use typically are grown on a metal substrate, such as copper foil, before being transferred to an insulating support for device fabrication. This transfer step can introduce impurities that affect how well the device performs. Efforts to grow graphene on insulating supports have not been able to produce the required high-quality single crystals.



“If graphene can be grown on an insulating substrate with a clean interface, certain devices might function better,” says Ph.D. student Bo Tian, who co-led the study under Xixiang Zhang’s supervision. “This also opens the door to new types of graphene-based nanodevices,” he explains.



Zhang, Tian and coworkers from Asia and Europe tweaked the chemical vapor deposition method, which relies on the copper-catalyzed decomposition of methane into carbon precursors, to generate smooth single-crystal graphene monolayers on wafer-scale single-crystal substrates called c-plane sapphire.

The researchers converted polycrystalline copper foil into its single-crystal counterpart Cu(111) on the sapphire surface and introduced active carbon atoms from the metal substrate-catalyzed decomposition of methane on the resulting film. The carbon atoms diffused through the metallic film toward the copper–sapphire interface, which acted as a template, and formed well-oriented graphene islands that, after several growth cycles, merged to yield a sheet.



In addition to weak surface interactions, the copper film and sapphire displayed similar crystal lattice symmetry to that of graphene, Tian says, which explains the high crystallinity of the graphene monolayer.



The researchers etched away any graphene that had accumulated on top of the copper film using a hydrogen–argon plasma to facilitate carbon diffusion. They immersed the samples in liquid nitrogen before heating them rapidly to 500 degrees Celsius, making the copper film easy to peel off while keeping the graphene monolayer intact.



Field-effect transistors manufactured on the sapphire-grown single-crystal graphene monolayer exhibited excellent performance with higher carrier mobilities. The superior electronic performance of the graphene grown on sapphire results from its higher crystallinity and fewer folds on the surface, Tian explains.



“Our team is now trying to grow other two-dimensional materials on the insulator-supported graphene to build functionalized large-scale heterostructures,” Tian says. These heterostructures held together by van der Waals interactions are expected to be useful in future nanodevices.

####

For more information, please click here

Contacts:
Michael Cusack
King Abdullah University of Science & Technology (KAUST)

Office: 009660128083040
Expert Contact

Xixiang Zhang
King Abdullah University of Science and Technology (KAUST)

Copyright © King Abdullah University of Science & Technology (KAUST)

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

ARTICLE TITLE

Related News Press

2 Dimensional Materials

A 2D device for quantum cooling:EPFL engineers have created a device that can efficiently convert heat into electrical voltage at temperatures lower than that of outer space. The innovation could help overcome a significant obstacle to the advancement of quantum computing technol July 5th, 2024

Graphene/ Graphite

A 2D device for quantum cooling:EPFL engineers have created a device that can efficiently convert heat into electrical voltage at temperatures lower than that of outer space. The innovation could help overcome a significant obstacle to the advancement of quantum computing technol July 5th, 2024

Display technology/LEDs/SS Lighting/OLEDs

Efficient and stable hybrid perovskite-organic light-emitting diodes with external quantum efficiency exceeding 40 per cent July 5th, 2024

New organic molecule shatters phosphorescence efficiency records and paves way for rare metal-free applications July 5th, 2024

News and information

New organic molecule shatters phosphorescence efficiency records and paves way for rare metal-free applications July 5th, 2024

Single atoms show their true color July 5th, 2024

New method cracked for high-capacity, secure quantum communication July 5th, 2024

Wearable electronics

CityU awarded invention: Soft, ultrathin photonic material cools down wearable electronic devices June 30th, 2023

Liquid metal sticks to surfaces without a binding agent June 9th, 2023

Breaking through the limits of stretchable semiconductors with molecular brakes that harness light June 9th, 2023

Vertical electrochemical transistor pushes wearable electronics forward: Biomedical sensing is one application of efficient, low-cost transistors January 20th, 2023

Possible Futures

A 2D device for quantum cooling:EPFL engineers have created a device that can efficiently convert heat into electrical voltage at temperatures lower than that of outer space. The innovation could help overcome a significant obstacle to the advancement of quantum computing technol July 5th, 2024

New method cracked for high-capacity, secure quantum communication July 5th, 2024

Searching for dark matter with the coldest quantum detectors in the world July 5th, 2024

Atomic force microscopy in 3D July 5th, 2024

Discoveries

Efficient and stable hybrid perovskite-organic light-emitting diodes with external quantum efficiency exceeding 40 per cent July 5th, 2024

A New Blue: Mysterious origin of the ribbontail ray’s electric blue spots revealed July 5th, 2024

New organic molecule shatters phosphorescence efficiency records and paves way for rare metal-free applications July 5th, 2024

Single atoms show their true color July 5th, 2024

Announcements

New organic molecule shatters phosphorescence efficiency records and paves way for rare metal-free applications July 5th, 2024

Single atoms show their true color July 5th, 2024

New method cracked for high-capacity, secure quantum communication July 5th, 2024

Searching for dark matter with the coldest quantum detectors in the world July 5th, 2024

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Single atoms show their true color July 5th, 2024

New method cracked for high-capacity, secure quantum communication July 5th, 2024

Searching for dark matter with the coldest quantum detectors in the world July 5th, 2024

Atomic force microscopy in 3D July 5th, 2024

Solar/Photovoltaic

Development of zinc oxide nanopagoda array photoelectrode: photoelectrochemical water-splitting hydrogen production January 12th, 2024

Shedding light on unique conduction mechanisms in a new type of perovskite oxide November 17th, 2023

Inverted perovskite solar cell breaks 25% efficiency record: Researchers improve cell efficiency using a combination of molecules to address different November 17th, 2023

Charged “molecular beasts” the basis for new compounds: Researchers at Leipzig University use “aggressive” fragments of molecular ions for chemical synthesis November 3rd, 2023

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project