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Two-dimensional alloys (or surface alloys) are a single atomic layer of alloy that is incommensurate with the underlying substrate. One example is the 2D ordered alloys of Pb with Sn and with Bi. [ 62 ] [ 63 ] Surface alloys have been found to scaffold two-dimensional layers, as in the case of silicene .
Two dimensional hexagonal boron nitride (2D h-BN) is a material of comparable structure to graphene with potential applications in e.g. photonics., [1] fuel cells [2] and as a substrate for two-dimensional heterostructures. [3] 2D h-BN is isostructural to graphene, but where graphene is conductive, 2D h-BN is a wide-gap insulator. [3]
A nanofoam has a liquid or solid matrix, filled with a gaseous phase, where one of the two phases has dimensions on the nanoscale. A nanoporous material is a solid material containing nanopores, voids in the form of open or closed pores of sub-micron lengthscales. A nanocrystalline material has a significant fraction of crystal grains in the ...
The layer-dependent optoelectronic properties of MoS 2 have promoted much research in 2-dimensional MoS 2-based devices. 2D MoS 2 can be produced by exfoliating bulk crystals to produce single-layer to few-layer flakes either through a dry, micromechanical process or through solution processing.
Ruddlesden-Popper (RP) phases are a type of perovskite structure that consists of two-dimensional perovskite-like slabs interleaved with cations.The general formula of an RP phase is A n+1 B n X 3n+1, where A and B are cations, X is an anion (e.g., oxygen), and n is the number of octahedral layers in the perovskite-like stack. [1]
(a) Structure of a hexagonal TMD monolayer. M atoms are in black and X atoms are in yellow. (b) A hexagonal TMD monolayer seen from above. Transition-metal dichalcogenide (TMD or TMDC) monolayers are atomically thin semiconductors of the type MX 2, with M a transition-metal atom (Mo, W, etc.) and X a chalcogen atom (S, Se, or Te).
Structure of a two-dimensional Wigner crystal in a parabolic potential trap with 600 electrons. Triangles and squares mark positions of the topological defects. A Wigner crystal is the solid (crystalline) phase of electrons first predicted by Eugene Wigner in 1934.
MXenes adopt three structures with one metal on the M site, as inherited from the parent MAX phases: M 2 C, M 3 C 2, and M 4 C 3.They are produced by selectively etching out the A element from a MAX phase or other layered precursor (e.g., Mo 2 Ga 2 C), which has the general formula M n+1 AX n, where M is an early transition metal, A is an element from group 13 or 14 of the periodic table, X is ...