Thermal expansion measurements of nano-graphite using high-temperature X-ray diffraction

Akikubo, Kazuma; Kurahashi, Tyler; Kawaguchi, Shuto; Tachibana, Masaru

doi:10.1016/j.carbon.2020.07.027

Cited by 18 publications

(10 citation statements)

References 35 publications

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“…The TECs of 2D materials are difficult to directly measure since 2D materials are atomically thin and optically transparent. Previous works have used various metrologies to characterize TECs of 2D materials, such as scanning electron microscopy (18), transmission electron microscopy (19), X-ray diffraction (20), atomic force microscopy (21), and Raman spectroscopy (16,(22)(23)(24)(25)(26). Despite tremendous efforts, only the TECs of a small portion of 2D materials have been studied in the past decade, and there exists a large discrepancy by more than two orders of magnitude for the same 2D material among the existing experimental characterizations (24,(26)(27)(28), from ~10 −4 K −1 (thermally expanding like liquids or polymers) to ~10 −7 K −1 (as rigid as fused silica).…”

Section: Introductionmentioning

confidence: 99%

A unified approach and descriptor for the thermal expansion of two-dimensional transition metal dichalcogenide monolayers

et al. 2022

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Two-dimensional (2D) materials have enabled promising applications in modern miniaturized devices. However, device operation may lead to substantial temperature rise and thermal stress, resulting in device failure. To address such thermal challenges, the thermal expansion coefficient (TEC) needs to be well understood. Here, we characterize the in-plane TECs of transition metal dichalcogenide (TMD) monolayers and demonstrate superior accuracy using a three-substrate approach. Our measurements confirm the physical range of 2D monolayer TECs and, hence, address the more than two orders of magnitude discrepancy in literature. Moreover, we identify the thermochemical electronegativity difference of compositional elements as a descriptor, enabling the fast estimation of TECs for various TMD monolayers. Our work presents a unified approach and descriptor for the thermal expansion of TMD monolayers, which can serve as a guideline toward the rational design of reliable 2D devices.

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Section: Introductionmentioning

confidence: 99%

A unified approach and descriptor for the thermal expansion of two-dimensional transition metal dichalcogenide monolayers

et al. 2022

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“…CNW in the MoS2 crystal plane, it could also be due to van der Waals forces between surface of MoS2 and graphene sheets [9].…”

Section: Introductionmentioning

confidence: 99%

Innovative Variation in Morphological Characteristics of Carbon Nanowall Grown on Molybdenum Disulfide Interlayer

Kim¹,

Kim²,

Kwon³

et al. 2022

Preprint

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Carbon, which exists in large quantities on Earth, is a material with interesting properties, and many studies have been conducted since the past. In particular, nano-sized carbon allotropes are called carbon nanomaterials, and many studies are currently underway. Among them, carbon nanowall (CNW) is a structure in which graphene of sp2 bond is grown vertically, CNW have outstanding strength, can be highly electrically conducting or semiconducting, have a large specific surface area per unit mass. Electrical, chemical, physical properties of these CNW is modified by parameter such as surface density, height and thickness of it. Those have great effect on CNW and can be adjusted as growth interlayer. It was confirmed that the molybdenum disulfide (MoS2) interlayer synthesized by radio frequency (RF) magnetron sputtering altered the morphological characteristics such as the shaped edge of the CNW, the pores diameter and density. Through these studies, we confirmed the effect of MoS2 on the morphological characteristics of CNW. This opens the door to improving the performance of electrodes and devices.

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“…CNWs grown on the MoS 2 interlayer showed interesting morphological characteristics. These results are attributed to the initial growth of CNWs in the MoS 2 crystal plane, and could also be due to van der Waals forces between the surface of MoS 2 and graphene sheets [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Innovative Variation in the Morphological Characteristics of Carbon Nanowalls Grown on a Molybdenum Disulfide Interlayer

Kim

Kwon

et al. 2022

Nanomaterials

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Carbon is a material with interesting properties which exists in large quantities on Earth, so many studies involving carbon have been conducted. In particular, nano-sized carbon allotropes, referred to as carbon nanomaterials, comprise the subject of various studies currently underway. The electrical, chemical, physical properties of carbon nanowalls (CNWs) are modified by parameters such as surface density, height and thickness. These characteristics have significant effects on CNWs and can be adjusted as a growth interlayer. It was confirmed that the molybdenum disulfide (MoS2) interlayer synthesized in this paper by radio frequency (RF) magnetron sputtering altered the morphological characteristics of the CNWs, including its shaped edge, pores diameter and density. We provide interesting results through FE-SEM, EDS and Raman analysis in this paper. Based on the Raman analysis, both the D-peak of carbon and the ID/IG ratio decreased. Through this study, the effect of MoS2 on the morphological characteristics of CNWs was confirmed.

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Thermal expansion measurements of nano-graphite using high-temperature X-ray diffraction

Cited by 18 publications

References 35 publications

A unified approach and descriptor for the thermal expansion of two-dimensional transition metal dichalcogenide monolayers

A unified approach and descriptor for the thermal expansion of two-dimensional transition metal dichalcogenide monolayers

Innovative Variation in Morphological Characteristics of Carbon Nanowall Grown on Molybdenum Disulfide Interlayer

Innovative Variation in the Morphological Characteristics of Carbon Nanowalls Grown on a Molybdenum Disulfide Interlayer

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