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<p>Nanocrystalline substitutional solid solutions of molybdenum dichalcogenides, 2D MoS<sub>2–x</sub>Se<sub>x</sub> (0 ≤ x ≤ 2), were synthesized by chemical vapor deposition. X-ray diffraction studies established that they had homogeneous chemical composition and a uniform layered structure (2H-MoS<sub>2</sub>), consisted of nanostructures (2D, few-layer nanosheets), and did not contain impurities of foreign phases, including X-ray amorphous ones, and other nanostructures or microsized particles. The average sizes of anisotropic 2D MoS<sub>2–x</sub>Se<sub>x</sub> (x = 0, 0.25, 0.5, 1, 1.5, 1.75, and 2) nanoparticles were determined in the crystallographic [013] and [110] directions: d<sub>[013]</sub> = 2.9(2)–60.5(4) nm and d<sub>[110]</sub> = 10.4(6)–126(8) nm, respectively. Data on the averaged 2D MoS<sub>2–x</sub>Se<sub>x</sub> (0 ≤ x ≤ 2) atomic structure indicated that homogeneity existed over the entire composition range. The average sizes of 2D MoS<sub>2–x</sub>Se<sub>x</sub> (0 ≤ x ≤ 2) nanoparticles, lattice parameters a and c, and unit cell volumes V correlated with the chemical composition of the solid solutions with a statistical distribution of S and Se atoms. The parameters a, c, and V increased linearly with the Se content in 2D MoS<sub>2–x</sub>Se<sub>x</sub> (0 ≤ x ≤ 2) nanostructures according to Vegard’s rule. The electron microscopy results indicated that 2D MoS<sub>2–x</sub>Se<sub>x</sub> (0 ≤ x ≤ 2) nanoparticles had well-defined outlines (as triangles or hexagons). Their morphology qualitatively depended on the composition and, consequently, on the state of S–Se solution–melt and pressures of chalcogens in the vapor phase in chemical vapor deposition. The research findings can serve as a basis for developing competitive laboratory nanotechnologies for producing nanocrystalline (few-layer nanosheets) 2D MoS<sub>2–x</sub>Se<sub>x</sub> (0 ≤ x ≤ 2) substitutional solid solutions and studying their structural properties as components of interdisciplinary studies aimed at developing new multifunctional 2D nanomaterials.</p>

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2D MoS2–xSex (0 ≤ x ≤ 2) Solid Solutions: Structural Properties

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • L. M. Kulikov,
  • N. B. Konih-Ettel,
  • L. G. Akselrud

摘要

Nanocrystalline substitutional solid solutions of molybdenum dichalcogenides, 2D MoS2–xSex (0 ≤ x ≤ 2), were synthesized by chemical vapor deposition. X-ray diffraction studies established that they had homogeneous chemical composition and a uniform layered structure (2H-MoS2), consisted of nanostructures (2D, few-layer nanosheets), and did not contain impurities of foreign phases, including X-ray amorphous ones, and other nanostructures or microsized particles. The average sizes of anisotropic 2D MoS2–xSex (x = 0, 0.25, 0.5, 1, 1.5, 1.75, and 2) nanoparticles were determined in the crystallographic [013] and [110] directions: d[013] = 2.9(2)–60.5(4) nm and d[110] = 10.4(6)–126(8) nm, respectively. Data on the averaged 2D MoS2–xSex (0 ≤ x ≤ 2) atomic structure indicated that homogeneity existed over the entire composition range. The average sizes of 2D MoS2–xSex (0 ≤ x ≤ 2) nanoparticles, lattice parameters a and c, and unit cell volumes V correlated with the chemical composition of the solid solutions with a statistical distribution of S and Se atoms. The parameters a, c, and V increased linearly with the Se content in 2D MoS2–xSex (0 ≤ x ≤ 2) nanostructures according to Vegard’s rule. The electron microscopy results indicated that 2D MoS2–xSex (0 ≤ x ≤ 2) nanoparticles had well-defined outlines (as triangles or hexagons). Their morphology qualitatively depended on the composition and, consequently, on the state of S–Se solution–melt and pressures of chalcogens in the vapor phase in chemical vapor deposition. The research findings can serve as a basis for developing competitive laboratory nanotechnologies for producing nanocrystalline (few-layer nanosheets) 2D MoS2–xSex (0 ≤ x ≤ 2) substitutional solid solutions and studying their structural properties as components of interdisciplinary studies aimed at developing new multifunctional 2D nanomaterials.