| Could 23, 2024 |
|
(Nanowerk Information) Two-dimensional transition metallic dichalcogenides (2D TMDs) exhibit numerous polymorphic constructions, together with 2H (trigonal prismatic), 1T (octahedral), 1T′ and Td phases. These phases confer a spread of properties equivalent to superconductivity, ferroelectricity and ferromagnetism.
|
|
By manipulating these structural phases, the wealthy bodily properties of TMDs could be tuned, enabling exact management over their traits by way of what is named section engineering.
|
|
On this work, a analysis staff led by Professor Andrew Wee from the Division of Physics underneath the Nationwide College of Singapore (NUS) School of Science, in collaboration with worldwide companions, utilised molecular beam epitaxy (MBE) to develop molybdenum diselenide (MoSe2) nanoribbons as an in-plane heteroepitaxial template to seed the expansion of H-phase chromium diselenide (CrSe2).
|
|
| Determine exhibits (a) a schematic illustration of the epitaxial progress of T-phase and H-phase CrSe2. The H-phase CrSe2 is grown by utilizing a seed layer. (b) Scanning tunneling microscopy (STM) picture of the MoSe2-CrSe2 lateral heterostructures displaying CrSe2 segments seamlessly related with the MoSe2 nanoribbons. (Picture: Nature Communications)
|
|
MBE is a method for creating very skinny layers of supplies on a floor by depositing molecules one after the other. This enables for the exact management of the composition, thickness and construction of the deposited layers on the atomic degree.
|
|
Utilizing ultra-high vacuum scanning tunneling microscopy (STM) and non-contact atomic power microscopy (nc-AFM) methods, the researchers noticed atomically sharp heterostructure interfaces with type-I band alignments and the attribute defects of mirror twin boundaries within the H-phase CrSe2 monolayers. These mirror twin boundaries exhibited distinctive behaviour inside the confined one-dimensional digital system.
|
|
The analysis findings have been revealed within the scientific journal Nature Communications (“Phase-selective in-plane heteroepitaxial growth of H-phase CrSe2“).
|
|
This analysis represents a continuation of the staff’s ongoing exploration into section construction management and bodily property research of 2D supplies.
|
|
Dr LIU Meizhuang, the primary writer of the analysis paper, stated, “We have also realised the phase-selective growth of H-phase vanadium diselenide using this in-plane heteroepitaxial template. This phase-selective in-plane heteroepitaxial method has the potential to become a general and controllable way for expanding the library of 2D-TMD phase structures, thereby advancing fundamental research and device applications of specific 2D phases.”
|
|
Prof Wee added, “The ability to control the phase of 2D lateral heterostructures opens many new opportunities in device applications.”
|
