Atomic force microscope observation of MoS2 particles    synthesized on mica, MoS2, and graphite

Uetsuka, Hiroshi; Ōnishi, Hiroshi; Ikeda, Satoshi; Harada, Yoshihisa; Sakama, Hiroshi; Sakashita, Yukio

doi:10.1380/ejssnt.2003.80

Cited by 6 publications

(6 citation statements)

References 27 publications

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“…In industrially relevant systems such as a HDS catalyst, however, MoS 2 is typically grown at much lower temperatures, between 573 and 673 K, using wet chemical procedures [15][16][17]. Transmission electron microscopy (TEM) studies of MoS 2 grown at low temperatures on various facets of rutile and anatase TiO 2 have shown the presence of "edge-on" supported MoS 2 slabs [18,19]. X-ray absorption fine structure (XAFS) studies of the Mo K-edge of MoS 2 slabs grown on TiO 2 (110) at lower temperature have indicated the presence of MoS 2 clusters with Mo being in five-fold coordination or less [20,21].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis Strategy for MoS2 Slabs Supported on TiO2(110)

Prabhu

Groot

2020

Surfaces

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MoS2 supported on oxides like TiO2 has a broad range of applications. The atomic structure of this system is therefore very useful to study. Previous research work in this area has made use of high-temperature synthesis methods, while the preparation of an MoS2/TiO2 in very important applications, such as catalysis, makes use of a low-temperature synthesis method. In this work, we investigate a low-temperature synthesis strategy for MoS2 slabs supported on rutile TiO2(110). Using scanning tunneling microscopy and X-ray photoelectron spectroscopy, we demonstrate that not only flat MoS2 slabs with irregular shapes but also MoSx stripes with a large number of coordinatively unsaturated Mo atoms are formed. In particular, it becomes evident that, for atomic structural characterization of MoS2/TiO2 and similar oxide-supported systems grown by low-temperature synthesis methods, the surface structure of the support becomes highly relevant.

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Section: Introductionmentioning

confidence: 99%

Low-Temperature Synthesis Strategy for MoS2 Slabs Supported on TiO2(110)

Prabhu

Groot

2020

Surfaces

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“…Atomic force microscope (AFM) is one of discoverable tools for elucidation of the microscopic description of the crystal growth mechanism. In fact, over the past few decades, a considerable number of AFM studies have been conducted on several particles such as polystyrene, − polyelectrolyte, molybdenum oxide, and aluminum . Particularly, growth processes of calcium carbonate in many systems have been studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

AFM Investigation for the Initial Growth Processes of Calcium Carbonate on Hydrophilic and Hydrophobic Substrate

Yamanaka

Ito

Shimosaka

et al. 2009

Crystal Growth & Design

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Heterogeneous nucleation and crystal growth of calcium carbonate on the mica and the highly oriented pyrolytic graphite (HOPG) substrate have been investigated by means of an atomic force microscope (AFM) with a contact mode procedure. AFM observation could lead to initial crystallization processes that were amorphous and crystalline, with an intermediate state between them. Amorphous calcium carbonate deposited on surfaces could be observed as a transient precursor phase of crystal. The shape of the amorphous calcium carbonate on the substrates is indicative of final crystal shape. Classical heterogeneous nucleation theory has been considered in order to describe the surface crystallization on the mica and the HOPG. We then measured the contact angle between the amorphous calcium carbonate and the substrates. The formation energy required for the heterogeneous nucleation on the HOPG surface was 40 times higher than that on the mica surface. To explain the difference in the mica and the HOPG surface, we have discussed a possible model for the interfacial structure between the solution and the substrate.

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“…Molybdenum oxides have been studied in the past on supports such as Au(111), [28][29][30][31][32] highly-oriented pyrolytic graphite (HOPG), 33 NiAl 34 and TiO 2 (110). 35 The typical preparation methods used in these studies involve direct sublimation of MoO 3 powder, oxidation of Mo clusters, or CVD-like processes involving carbonyl complexes of Mo with NO 2 as the oxidizing agent.…”

Section: Introductionmentioning

confidence: 99%