Mo-Terminated Edge Reconstructions in Nanoporous Molybdenum Disulfide Film.

Title	Mo-Terminated Edge Reconstructions in Nanoporous Molybdenum Disulfide Film.
Authors	X. Zhao; D. Fu; Z. Ding; Y.Y. Zhang; D. Wan; S.J.R. Tan; Z. Chen; K. Leng; J. Dan; W. Fu; D. Geng; P. Song; Y. Du; T. Venkatesan; S.T. Pantelides; S.J. Pennycook; W. Zhou; K.Ping Loh
Journal	Nano Lett
DOI	10.1021/acs.nanolett.7b04426
Abstract	The catalytic and magnetic properties of molybdenum disulfide (MoS2) are significantly enhanced by the presence of edge sites. One way to obtain a high density of edge sites in a two-dimensional (2D) film is by introducing porosity. However, the large-scale bottom-up synthesis of a porous 2D MoS2 film remains challenging and the correlation of growth conditions to the atomic structures of the edges is not well understood. Here, using molecular beam epitaxy, we prepare wafer-scale nanoporous MoS2 films under conditions of high Mo flux and study their catalytic and magnetic properties. Atomic-resolution electron microscopy imaging of the pores reveals two new types of reconstructed Mo-terminated edges, namely, a distorted 1T (DT) edge and the Mo-Klein edge. Nanoporous MoS2 films are magnetic up to 400 K, which is attributed to the presence of Mo-terminated edges with unpaired electrons, as confirmed by density functional theory calculation. The small hydrogen adsorption free energy at these Mo-terminated edges leads to excellent activity for the hydrogen evolution reaction.
Citation	X. Zhao; D. Fu; Z. Ding; Y.Y. Zhang; D. Wan; S.J.R. Tan; Z. Chen; K. Leng; J. Dan; W. Fu; D. Geng; P. Song; Y. Du; T. Venkatesan; S.T. Pantelides; S.J. Pennycook; W. Zhou; K.Ping Loh.Mo-Terminated Edge Reconstructions in Nanoporous Molybdenum Disulfide Film.. Nano Lett. 2018;18(1):482490. doi:10.1021/acs.nanolett.7b04426

Related Elements

Molybdenum

42 Mo 95.960000000 Molybdenum

See more Molybdenum products. Molybdenum (atomic symbol: Mo, atomic number: 42) is a Block D, Group 6, Period 5 element with an atomic weight of 95.96. Molybdenum Bohr Model The number of electrons in each of molybdenum's shells is [2, 8, 18, 13, 1] and its electron configuration is [Kr] 4d⁵ 5s¹. The molybdenum atom has a radius of 139 pm and a Van der Waals radius of 209 pm. In its elemental form, molybdenum has a gray metallic appearance. Molybdenum was discovered by Carl Wilhelm in 1778 and first isolated by Peter Jacob Hjelm in 1781. Molybdenum is the 54th most abundant element in the earth's crust. Elemental Molybdenum It has the third highest melting point of any element, exceeded only by tungsten and tantalum. Molybdenum does not occur naturally as a free metal, it is found in various oxidation states in minerals. The primary commercial source of molybdenum is molybdenite, although it is also recovered as a byproduct of copper and tungsten mining. The origin of the name Molybdenum comes from the Greek word molubdos meaning lead.

Sulfur

16 S 32.065000000 Sulfur

See more Sulfur products. Sulfur (or Sulphur) (atomic symbol: S, atomic number: 16) is a Block P, Group 16, Period 3 element with an atomic radius of 32.066. Sulfur Bohr Model The number of electrons in each of Sulfur's shells is 2, 8, 6 and its electron configuration is [Ne] 3s² 3p⁴. In its elemental form, sulfur has a light yellow appearance. The sulfur atom has a covalent radius of 105 pm and a Van der Waals radius of 180 pm. In nature, sulfur can be found in hot springs, meteorites, volcanoes, and as galena, gypsum, and epsom salts. Sulfur has been known since ancient times but was not accepted as an element until 1777, when Antoine Lavoisier helped to convince the scientific community that it was an element and not a compound.