Molybdenum Disulfid: Differentiating Polymorphs in Molybdenum Disulfide via Electron Microscopy (Adv. Mater. 47/2018)

Zhao, Xiuxi; Ning, Shoucong; Fu, Wei; Pennycook, Stephen J.; Loh, Kian Ping

doi:10.1002/adma.201870360

Cited by 5 publications

(7 citation statements)

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“…The contrast of HAADF‐STEM images mainly depends on the atomic number ( Z ) and atom quantity. [ 40,41 ] The crystal structure of Mn 3 O 4 is illustrated in Figure a. Top views of projected planes along the [001] and [111] zone axes show the tetragonal and hexagonal arrangements of the atoms, while the side view reveals the nonlayered nature.…”

Section: Resultsmentioning

confidence: 99%

Phase Engineering of 2D Spinel‐Type Manganese Oxides

et al. 2023

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Two‐dimensional (2D) magnetic materials have been of interest due to their unique long‐range magnetic ordering in the low‐dimensional regime and potential applications in spintronics. Currently, most of the studies are focused on strippable van der Waals magnetic materials with layered structures, which typically suffer from a poor stability and scarce species. Spinel oxides have a good environmental stability and rich magnetic properties. However, the isotropic bonding and close‐packed nonlayered crystal structure make their 2D growth challenging, let alone the phase engineering. Herein, we report a phase‐controllable synthesis of 2D single‐crystalline spinel‐type oxides for the first time. Using the van der Waals epitaxy strategy, the thicknesses of the obtained tetragonal and hexagonal manganese oxide (Mn3O4) nanosheets can be tuned down to 7.1 nm and one unit cell (0.7 nm), respectively. The magnetic properties of these two phases are evaluated using vibrating‐sample magnetometry and first‐principle calculations. Both structures exhibit a Curie temperature of 48 K. Owing to its ultrathin geometry, the Mn3O4 nanosheet exhibits a superior ultraviolet detection performance with an ultralow noise power density of 0.126 pA/Hz1/2. This study broadens the range of 2D magnetic semiconductors and highlights their potential applications in future information devices.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Phase Engineering of 2D Spinel‐Type Manganese Oxides

et al. 2023

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“…[ 138–144 ] Furthermore, the improved resolution of HAADF combined with STEM renders it a popular tool for imaging vdW materials at the atomic scale. Zhao et al [ 145 ] identified various polymorphs and stacking polytypes of MoS 2 formed under different growth environments using HAADF‐STEM analysis with an appropriate image processing method. The authors reported that the microscopy images are consistent with the previously predicted simulations, indicating the reliability of TEM in studying the structures of vdW materials ( Figure a).…”

Section: Characterization Methods For Detecting Phase Transitions In ...mentioning

confidence: 99%

“…a) Atomic‐resolution ADF‐STEM images of a single layer of 1H, 1T, 1T′, bilayer 2H (AA′), bilayer 3R (AB)‐stacked, and trilayer 3R (ABC)‐stacked MoS 2 (from left to right). [ 145 ] Reproduced under the terms of the CC BY license. [ 145 ] Copyright 2016, The Authors, published by Wiley‐VCH.…”

Section: Characterization Methods For Detecting Phase Transitions In ...mentioning

confidence: 99%

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Phase Engineering of Two‐Dimensional Transition Metal Dichalcogenides

Kim,

Sung,

Lee

2023

Small Science

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Since the successful isolation of single‐layer graphene with an atomic thickness, various van der Waals (vdW) materials have been intensively studied owing to their unique properties. Among the families of vdW materials, transition metal dichalcogenides (TMDs) have served as representatives because of their diverse band structures and intriguing quantum states, unlike those observed in their bulk counterparts. Particularly, unconventional polymorphic phases of TMDs increase the degrees of freedom in device fabrication and property modulation. As variations in structural phases significantly change the electrical, physical, and chemical properties of materials, phase engineering is essential for the new paradigm of TMD‐based devices. In this review, diverse strategies that can induce and control structural phases in TMDs are explored. After introducing the polymorphic phase changes and the resulting electronic band structures, the various empirical approaches used for manipulating phases in vdW materials, including phase‐selective synthesis and post‐synthesis treatments, are summarized. The group‐VI TMDs are considered as reference, and the analysis is extended to other TMDs across various groups in the periodic table. In addition to providing a comprehensive survey of the recent progress in TMD applications, the challenges for TMD applications and potential opportunities in emerging fields are discussed.

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“…The layer‐by‐layer stacking sequence determines not only phases but also the band structures of MoS 2 , leading to a distinct electromagnetic property. [ 35,36 ]…”

Section: Revealing Atomic Structures Of 2d Materialsmentioning

confidence: 99%

Atomic‐Scale Insights into the 2D Materials from Aberration‐Corrected Scanning Transmission Electron Microscopy: Progress and Future

Sohn,

Kim,

Jang

2023

Small Science

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2D crystals are attractive due to their unique atomic, electronic structures, and physiochemical properties, which strongly rely on the synthesis conditions. The atomic structure and presence of defects in the crystal lattice, such as vacancies, dopants, grain boundaries, and edge terminations, significantly influence the properties of 2D materials. Due to its high spatial resolution, aberration‐corrected scanning transmission electron microscopy (AC‐STEM) has become a powerful tool to provide atomic‐scale insights into the crystal structure, defects, heterointerfaces, ferroelectricity, and in situ observations of 2D materials. This review will cover the status of atomic‐scale studies on various 2D materials, including graphene, boron nitride, transition metal dichaogenides, MXenes, and phosphorene using AC‐STEM. The future perspective of AC‐STEM for new findings in 2D materials using machine learning is further discussed.

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Molybdenum Disulfid: Differentiating Polymorphs in Molybdenum Disulfide via Electron Microscopy (Adv. Mater. 47/2018)

Cited by 5 publications

References 0 publications

Phase Engineering of 2D Spinel‐Type Manganese Oxides

Phase Engineering of 2D Spinel‐Type Manganese Oxides

Phase Engineering of Two‐Dimensional Transition Metal Dichalcogenides

Atomic‐Scale Insights into the 2D Materials from Aberration‐Corrected Scanning Transmission Electron Microscopy: Progress and Future

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