Intrinsically patterned two-dimensional materials for selective adsorption of molecules and nanoclusters

Abstract

Two-dimensional (2D) materials have been studied extensively as monolayers, vertical or lateral heterostructures. To achieve functionalization, monolayers are often patterned using soft lithography and selectively decorated with molecules. Here we demonstrate the growth of a family of 2D materials that are intrinsically patterned. We demonstrate that a monolayer of PtSe can be grown on a Pt substrate in the form of a triangular pattern of alternating 1T and 1H phases. Moreover, we show that, in a monolayer of CuSe grown on a Cu substrate, strain relaxation leads to periodic patterns of triangular nanopores with uniform size. Adsorption of different species at preferred pattern sites is also achieved, demonstrating that these materials can serve as templates for selective self-assembly of molecules or nanoclusters, as well as for the functionalization of the same substrate with two different species.

Epitaxially grown monolayer VSe 2 : an air-stable magnetic two-dimensional material with low work function at edges

“…In short, comparison of XPS signals from both selenium and vanadium elements shows an accordance between bulk VSe 2 and as-grown monolayer VSe 2 . This accordance in peaks suggests that the as-grown monolayer VSe 2 has the same 1T configuration with bulk VSe 2 , since the 2H or 1T configuration of the TMDC materials can be distinguished by the element's characteristic peaks in XPS spectra [22,34,35], and the bulk VSe 2 exists naturally in 1T phase [24].…”

“…Transition metal dichalcogenides (TMDC) are an emerging class of 2D materials with naturally layered structure. While applications of their electronic and optical functional properties have been very successful [20][21][22][23], investigation of their magnetic properties materials is still in its infancy, and hindered by a lack of both high-quality 2D samples and measurement techniques for magnetism in very thin samples. Vanadium diselenide (VSe 2 ) is a typical TMDC material with an MX 2 formula and a sandwiched layer structure.…”

Recent Progress on 2D Noble‐Transition‐Metal Dichalcogenides

“…As mentioned before, the thermodynamically favored structure of 2D NTMDs is octahedral (PtTe 2 , PdTe 2 , PtSe 2 , and PtS 2 ) or orthorhombic pentagonal structure (PdS 2 and PdSe 2 ), but the stable lattice structure of the 2D NTMDs is largely depend on varying external parameters due to their strong interlayer interaction and relatively weaker covalent bond strength . Especially for PdS 2 and PdSe 2 , which exhibits puckered pentagonal network with a tilted Se–Se dumbbell passing through the Pd layer, leading to the lack of rotational symmetry and potential sensitivity to defects .…”

Ultrafast and sensitive photodetector based on a PtSe2/silicon nanowire array heterojunction with a multiband spectral response from 200 to 1550 nm

“…The current approaches for fabricating PtSe 2 layers are limited to mechanical exfoliation 19 and chemical vapor deposition 20 , which usually yield PtSe 2 nanosheets with uncontrollable sizes. Another approach to obtaining single-crystalline PtSe 2 and a large film of layered PtSe 2 is molecular beam epitaxy, but this method suffers from a high cost and slow growth rate 18,21 . Recently, scalable and horizontal 2D layered PtSe 2 films prepared by either an aqueous-phase reaction 22 or thermally assisted conversion 23,24 are considered as prerequisites for electronic and optoelectronic device applications.…”