Top Page | English | 简体中文 | 繁體中文 | 한국어 | 日本語
Friday, 6 May 2022, 22:00 HKT/SGT
Share:
    

Source: Science and Technology of Advanced Materials
A new age of 2.5D materials
2.5-dimensional materials promise new applications for artificial intelligence, electronics, automobiles and the energy sector.

TSUKUBA, Japan, May 6, 2022 - (ACN Newswire) - Scientists are exploring new ways to artificially stack two-dimensional (2D) materials, introducing so-called 2.5D materials with unique physical properties. Researchers in Japan reviewed the latest advances and applications of 2.5D materials in the journal Science and Technology of Advanced Materials.

By stacking layers of different 2D materials, it is now possible to create 2.5D materials with unique physical properties that can be used in solar cells, quantum devices and devices with very low energy consumption. (Credit: STAM)

"The 0.5D concept symbolizes freedom from the composition, materials, angles and space typically used in 2D materials research," explains nanomaterials scientist and lead author Hiroki Ago of Kyushu University in Japan.

2D materials, like graphene, consist of a single layer of atoms and are used in applications like flexible touch panels, integrated circuits and sensors.

Recently, new methods have been introduced to make it possible to artificially stack 2D materials vertically, in-plane or at twisted angles regardless of their compositions and structures. This is thanks to the ability to control the van der Waals forces: weak electric interactions between atoms and molecules, similar to a microfiber cloth's attraction of dust. It is also now possible to integrate 2D materials with other dimensional materials, such as ions, nanotubes and bulk crystals.

A common method for fabricating 2.5D materials is chemical vapour deposition (CVD), which deposits a layer, one atom or molecule at a time, onto a solid surface. Commonly used building blocks for 2.5D materials include graphene, hexagonal boron nitride (hBN) (a compound used in cosmetics and aeronautics), and transition metal dichalcogenides (TMDCs) (a nanosheet semiconductor).

Using the CVD method, researchers selectively synthesized a bilayer of graphene, the simplest form of a 2.5D material, using a copper-nickel foil with relatively high nickel concentration as a catalyst. Nickel makes carbon highly soluble, giving researchers more control over the number of graphene layers. When an electrical field was applied vertically across the bilayer of graphene, it opened a band gap, meaning that its conductivity can be turned on and off. This is a phenomenon that is not observed in monolayer graphene because it has no band gap and stays on all the time. By tilting the stacking angle one degree, scientists found that the material became superconducting.

Similarly, another group in the UK and the US found that a layer of graphene and hBN results in the quantum Hall effect, a conduction phenomenon involving a magnetic field that produces a difference of potential. Others showed that stacking TMDCs traps excitons (electrons paired with their associated holes in a bound state) in the overlapping lattice patterns. This can lead to applications in information storage devices. New robotic assembly techniques have also made it possible to build more complex vertical structures, including a stacked heterostructure consisting of 29 alternating layers of graphene and hBN, for example.

Other research has used the nanospaces that form between the layers of a 2.5D material to insert molecules and ions in order to improve the electrical, magnetic and optical properties of the host material.

So far, for example, researchers have found that graphene stabilises iron chloride when it is inserted between its stacked layers, while inserting lithium ions leads to a faster diffusion rate (how quickly molecules spread in an area) than that of graphite, an electrical conductor used in batteries. This implies the material could be used in high-performance rechargeable batteries.

Additionally, researchers found that inserting aluminium chloride molecules between two graphene sheets leads to the formation of new crystalline structures that are completely different from the bulk aluminium chloride crystal. More research is needed to understand why this happens and what applications it might have.

"There are many opportunities to explore with this new 2.5D concept," Ago says.

Future applications of 2.5D materials include solar cells, batteries, flexible devices, quantum devices, and devices with very low energy consumption.

The next steps should incorporate machine learning, deep learning and materials informatics in order to further advance the design and synthesis of 2.5D materials.

Japan's Ministry of Education, Culture, Sports, Science and Technology is now supporting this new concept to develop new materials under the collaborative project "Science of 2.5 Dimensional Materials: Paradigm Shift of Materials Science Toward Future Social Innovation", which involves 40 researchers in Japan, including Ago's team.

Further information
Hiroki Ago
Kyushu University
Email: ago.hiroki.974@m.kyushu-u.ac.jp

Research paper: https://www.tandfonline.com/doi/full/10.1080/14686996.2022.2062576

About Science and Technology of Advanced Materials (STAM)

Open access journal STAM publishes outstanding research articles across all aspects of materials science, including functional and structural materials, theoretical analyses, and properties of materials. https://www.tandfonline.com/STAM

Dr. Masanobu Naito
STAM Publishing Director
Email: NAITO.Masanobu@nims.go.jp

Press release distributed by Asia Research News for Science and Technology of Advanced Materials.


Topic: Press release summary
Source: Science and Technology of Advanced Materials

Sectors: Electronics, Science & Nanotech, Science & Research
http://www.acnnewswire.com
From the Asia Corporate News Network


Copyright © 2022 ACN Newswire. All rights reserved. A division of Asia Corporate News Network.



Science and Technology of Advanced Materials
Dec 2, 2022 20:00 HKT/SGT
Revealing crystal structures robotically
Nov 7, 2022 23:00 HKT/SGT
New data extracted from old for materials databases
Sept 1, 2022 00:00 HKT/SGT
Windows gain competitive edge over global warming
June 27, 2022 17:00 HKT/SGT
Novel patching material for bone defects
May 25, 2022 17:00 HKT/SGT
Machine learning speeds up search for new sustainable materials
Feb 18, 2022 19:00 HKT/SGT
Portable generator powers small safety devices
Jan 18, 2022 22:00 HKT/SGT
Tiny electric generators could accelerate wound healing
Sept 30, 2021 06:00 HKT/SGT
Improving machine learning for materials design
Aug 18, 2021 14:30 HKT/SGT
Submerged sensors to control wearable electronics
Aug 6, 2021 23:00 HKT/SGT
Hydrogel holds life-giving cells longer
More news >>
 News Alerts
Copyright © 2022 ACN Newswire - Asia Corporate News Network
Home | About us | Services | Partners | Events | Login | Contact us | Privacy Policy | Terms of Use | RSS
US: +1 214 890 4418 | Beijing: +86 400 879 3881 | Hong Kong: +852 8192 4922 | Singapore: +65 6549 7068 | Tokyo: +81 3 6859 8575

Connect With us: