SIMS study of Cs/MoS2(0001)

Karolewski, M.A.; Cavell, Ronald G.

doi:10.1016/0039-6028(89)90211-2

Cited by 13 publications

(1 citation statement)

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“…Despite the importance of the MoS 2 -based catalysts, only a limited number of studies have been published of these catalysts on the interpretation of reaction mechanisms − as well as on characterization of the alkali-doped MoS 2 surface. − In an effort to understand the fundamental chemistry involved in the MoS 2 -based catalysts, we investigated the surface atomic structures of a clean and Cs-covered MoS 2 (0002). The study was carried out using high-resolution X-ray photoemission spectroscopy (HRXPS), where HRXPS routinely achieves an energy resolution better than 0.3 eV and at the same time permits an angle-resolved X-ray photoemission spectroscopy (ARXPS) examination of the system with the purpose of determining surface structure and location of the electrons that are subject to photoemission.…”

Section: Introductionmentioning

confidence: 99%

Surface Structure of Single-Crystal MoS₂(0002) and Cs/MoS₂(0002) by X-ray Photoelectron Diffraction

et al. 1996

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The surface structure of a clean MoS 2 (0002) and an in situ Cs surface-doped MoS 2 (0002) has been studied using high-resolution X-ray photoemission spectroscopy. The X-ray photoelectron diffraction (XPD) patterns of the Mo 3d 5/2 and S 2p core levels from a clean, well-ordered MoS 2 (0002) show forward focusing intensity maxima along the directions of nearest neighbors in MoS 2 in both the polar and azimuthal angle scans. The XPD patterns in the azimuthal angle scan exhibit a pronounced photoelectron intensity maximum at every 60°, reflecting the 6-fold rotational symmetry of the basal plane. In addition, because of the finite electron escape depth and the short-range order of the scattered photoelectrons, the azimuthal scans of both the Mo 3d 5/2 and the S 2p core levels further display the 3-fold rotational symmetry of the trigonal prismatic local structure, which MoS 2 (0002) possesses. The deposition of Cs onto the MoS 2 (0002) surface at room temperature did not introduce any significant changes either in the low-energy electron diffraction or in the XPD patterns, indicating the absence of Cs-induced surface relaxation, but a new photoemission was observed 1.6 eV above the valence band edge of MoS 2 , which corresponds to the Cs 6s photoelectron shared with the MoS 2 lattice. Thus Cs/MoS 2 represents an electron donor-acceptor (EDA) surface complex.

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Section: Introductionmentioning

confidence: 99%

Surface Structure of Single-Crystal MoS₂(0002) and Cs/MoS₂(0002) by X-ray Photoelectron Diffraction

et al. 1996

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Surface Studies of Layered Materials in Relation to Energy Converting Interfaces

Jaegermann

1992

Physics and Chemistry of Materials With Low-Dimensional Structures

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