Controllable Synthesis of 2D and 1D MoS₂ Nanostructures on Au Surface

Abstract

A bottom‐up growth approach based on the assembly of binary atomic constituents delivers precise control over the edge termination and dimensions of nanostructures. Here, the dimensional crossover of MoS2 from 1D nanoribbons to 2D islands synthesized by the assembly of Mo and S atoms on Au(100) surface is studied. Low‐temperature scanning tunneling microscopy and in situ Q‐plus non‐contact atomic force microscopy are employed to elucidate the edge structure of MoS2 nanoribbons at the atomic scale, where three types of zigzag Mo‐edges with different sulfur terminations are observed. It is found that the thermodynamic instability of the armchair edges causes the 1D system to develop faceted zigzag edges which manifests in the morphological evolution from 1D ribbons to 2D triangles as the system size increases.

Large Area Synthesis of 1D‐MoSe2 Using Molecular Beam Epitaxy

“…Such a method however suffers from poor scalability. [8] However, this method requires the use of gold metallic substrate which is not ratio and growth duration), drastic changes in the morphology are observed (Figure 1f-h), As shown in Figure 1f, MoSe 2 nanoribbons with an average width of ≈15 nm and aspect ratio ranging from 4 to 30 are observed. [6,7] and it is not only until recently that TMDC nanoribbons of the MX 2 type have been synthesized by a template-assisted method.…”

“…[6,7] X-ray photoemission spectroscopy (XPS) was performed to determine the elemental composition and bonding states of the MBE-grown nanoribbons (Figure 2b). [8,15] In view of the high density of edge atoms which can have catalytic activities, we tested the hydrogen evolution reaction (HER) on the nanoribbons and 2D-film MoSe 2 samples. [14] The measured Mo 3d and Se 3d core level peaks are similar to that of the bulk single crystal.…”

“…The growth of 2D-MoSe 2 was performed using a substrate temperature of 500 °C (Figure 1c-e) and a high Se:Mo flux ratio consistent with previous growth approaches. [8] However, this method requires the use of gold metallic substrate which is not The domains were characterized by atomic force microscopy (AFM) to have a height of ≈0.8 nm (inset of Figure 1c), which is consistent with monolayer MoSe 2 [11] .…”

“…Such a method however suffers from poor scalability. [8] However, this method requires the use of gold metallic substrate which is not [6,7] and it is not only until recently that TMDC nanoribbons of the MX 2 type have been synthesized by a template-assisted method.…”

“…[6,7] and it is not only until recently that TMDC nanoribbons of the MX 2 type have been synthesized by a template-assisted method. [8] However, this method requires the use of gold metallic substrate which is not…”