Dozens of new 2-D materials similar to graphene are now available, thanks to research from Univ. of Manchester scientists. These 2-D crystals are capable of delivering designer materials with revolutionary new properties. The problem has been that the vast majority of these atomically thin 2-D crystals are unstable in air, so react and decompose before their properties can be determined and their potential applications investigated.
Writing in NanoLetters, the Univ. of Manchester team demonstrate how tailored fabrication methods can make these previously inaccessible materials useful.
By protecting the new reactive crystals with more stable 2-D materials, such as graphene, via computer control in a specially designed inert gas chamber environments, these materials can be successfully isolated to a single atomic layer for the first time.
Combining a range of 2-D materials in thin stacks give scientists the opportunity to control the properties of the materials, which can allow “materials-to-order” to meet the demands of industry.
High-frequency electronics for satellite communications, and lightweight batteries for mobile energy storage are just two of the application areas that could benefit from this research. The breakthrough could allow for many more atomically thin materials to be studied separately as well as serve as building blocks for multilayer devices with such tailored properties.
The team, led by Dr. Roman Gorbachev, used their unique fabrication method on two particular 2-D crystals that have generated intense scientific interest in the past 12 months but are unstable in air: black phosphorus and niobium diselenide.
The technique the team have pioneered allows the unique characteristics and excellent electronic properties of these air-sensitive 2-D crystals to be revealed for the first time.Read more