Origin of the R(15 × 3) surface reconstruction of carburized W(110) - revisited

Kim, Jihyun; Shin, Eun-Ha; Seo, Jae M.; Kim, H.; Rojas, Geoffrey; Chen, X.; Enders, Axel; Kim, Hanchul; Kim, J.-S.

doi:10.1016/j.susc.2018.10.023

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…In the following we therefore label the R(15×12) structure as the carbon‐poor tungsten carbide layer (noted as WC p ) and the R(15×3) structure as the carbon‐rich tungsten carbide layer (noted as WC r ). The C coverage (C/W ratio) of the R(15×3) structure has previously been determined by AES to be 0.64±0.07 and from STM as 4/15, 2/5 (see SI Figure b) and 13/15 . The interpretation of STM data of complex surfaces such as the WC x superstructures strongly relies on theory simulations .…”

Section: Resultsmentioning

confidence: 99%

“…The laterally averaging LEED and AES studies have given some insights into the periodicity and thermal stability of the two structures. C/W ratio of the R(15×3)‐C/W(110) structure was determined by AES to be 0.64±0.07, while the laterally resolved STM studies gave three different values . The R(15×3)‐C/W(110) structure was found to be stable up to 1100 °C.…”

Section: Introductionmentioning

confidence: 97%

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Visualizing Formation of Tungsten Carbide Model Catalyst and its Interaction with Oxygen

Meng

Ning

et al. 2020

ChemCatChem

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Construction of model metal carbide surfaces is essential for surface catalysis studies over carbide‐based catalysts. Here, well‐controlled growth of tungsten carbide (WCx) layers on W(110) including carbon‐rich R(15×3)‐C/W(110) and carbon‐poor R(15×12)‐C/W(110) structures has been clearly demonstrated using chemical vapor deposition (CVD) on a clean W(110) surface or carbon segregation from the bulk. Low‐energy electron microscopy (LEEM) and micro‐region LEED (μ‐LEED) characterizations confirm that the R(15×12) structure forms first and then transforms to the R(15×3) structure by incorporating more carbon atoms in the CVD or surface segregation processes. Oxidation of the WCx/W(110) surfaces in O2 atmosphere removes surface carbon atoms, driving the structural transformation from R(15×3) to R(15×12) first and then to a two‐dimensional oxide surface. Our work provides a clear guide for well‐controlled growth of model WCx catalysts and the structural transformation between them.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Visualizing Formation of Tungsten Carbide Model Catalyst and its Interaction with Oxygen

Meng

Ning

et al. 2020

ChemCatChem

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Atomic Structures and Electronic Properties of Carbide Surfaces Unraveled by Scanning Tunneling Microscopy

Guo,

Li,

Chen

et al. 2024

Adv Materials Inter

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Carbides, especially transition metal carbides (TMCs) and non‐metallic silicon carbides (SiCs), have registered wide applications in catalysis, superconductivity, semiconductor, and the like. Systematic studies have demonstrated the essential role of carbon in finetuning the atomic structures and electronic properties of carbides to improve their catalytic performance, superconducting transition temperature, and semiconductor bandgap. These advancements have positioned carbides as efficient substitutes for noble metals and crucial components in technological innovations. Scanning tunneling microscopy (STM) has emerged as a powerful technique in these studies, providing high‐resolution visualization and mapping of the surface geometric and electronic structures of these functionalized carbides. This review mainly focuses on the key aspects like the structures and properties of the aforementioned TMC and SiC surfaces unraveled by STM, aiming at understanding the fundamentals behind the state‐of‐the‐art technologies and advanced applications of the carbide‐involved functional systems. A very brief perspective on this topic is also provided at the end.

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Instability and transformation kinetics of the reconstructions in carburized W(1 1 0)

Kim

Seo

Rojas

et al. 2021

Applied Surface Science

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Origin of the R(15 × 3) surface reconstruction of carburized W(110) - revisited

Cited by 4 publications

References 21 publications

Visualizing Formation of Tungsten Carbide Model Catalyst and its Interaction with Oxygen

Visualizing Formation of Tungsten Carbide Model Catalyst and its Interaction with Oxygen

Atomic Structures and Electronic Properties of Carbide Surfaces Unraveled by Scanning Tunneling Microscopy

Instability and transformation kinetics of the reconstructions in carburized W(1 1 0)

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Origin of the R(15 × 3) surface reconstruction of carburized W(110) - revisited

Cited by 4 publications

References 21 publications

Visualizing Formation of Tungsten Carbide Model Catalyst and its Interaction with Oxygen

Visualizing Formation of Tungsten Carbide Model Catalyst and its Interaction with Oxygen

Atomic Structures and Electronic Properties of Carbide Surfaces Unraveled by Scanning Tunneling Microscopy

Instability and transformation kinetics of the reconstructions in carburized W(1 1 0)

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Product

Resources

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Origin of the R(15 × 3) surface reconstruction of carburized W(110) - revisited