3D Imaging and Manipulation of Subsurface Selenium Vacancies in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>PdSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Nguyen, Giang D.; Liang, Liangbo; Zou, Qiang; Fu, Mingming; Oyedele, Akinola D.; Sumpter, Bobby G.; Liu, Zheng; Gai, Zheng; Xiao, Kai; Li, An‐Ping

doi:10.1103/physrevlett.121.086101

Cited by 75 publications

(97 citation statements)

References 44 publications

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“…According to the large‐scale STM image in Figure a, the 2L PdSe 2 on Au exhibits a perfect square lattice, which coincides well with its orthorhombic structure. Further atom‐resolved STM image (Figure b) presents two square‐shape sublattices (marked by red and blue squares in Figure b), which possesses a mirror symmetry with lattice constants ≈0.59 and ≈0.60 nm along the

\overset{a}{true}

and

\overset{b}{true}

directions, respectively, the same as those of bulk PdSe 2 . Meanwhile, the presence of zigzag chain along the

\overset{b}{true}

direction (consisting of Se atoms on the top surface) indicates the anisotropy structure feature of PdSe 2 , as highlighted in Figure b.…”

Section: Resultssupporting

confidence: 79%

Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe₂ Ribbons

Jiang

Xie

et al. 2019

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Palladium diselenide (PdSe2) is an emerging 2D layered material with anisotropic optical/electrical properties, extra‐high carrier mobility, excellent air stability, etc. So far, ultrathin PdSe2 is mainly achieved via mechanical exfoliation from its bulk counterpart, and the direct synthesis is still challenging. Herein, the synthesis of ultrathin 2D PdSe2 on conductive Au foil substrates via a facile chemical vapor deposition route is reported. Intriguingly, an anisotropic growth behavior is detected from the evolution of ribboned flakes with large length/width ratios, which is well explained from the orthorhombic symmetry of PdSe2. A unique even‐layered growth mode from 2 to 20 layers is also confirmed by the perfect combination of onsite scanning tunneling microscopy characterizations, through deliberately scratching the flake edge to expose both even and odd layers. This even‐layered, ribboned 2D material is expected to serve as a perfect platform for exploring unique physical properties, and for developing high‐performance electronic and optoelectronic devices.

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\overset{a}{true}

and

\overset{b}{true}

directions, respectively, the same as those of bulk PdSe 2 . Meanwhile, the presence of zigzag chain along the

\overset{b}{true}

direction (consisting of Se atoms on the top surface) indicates the anisotropy structure feature of PdSe 2 , as highlighted in Figure b.…”

Section: Resultssupporting

confidence: 79%

Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe₂ Ribbons

Jiang

Xie

et al. 2019

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“…As mentioned before, the thermodynamically favored structure of 2D NTMDs is octahedral (PtTe 2 , PdTe 2 , PtSe 2 , and PtS 2 ) or orthorhombic pentagonal structure (PdS 2 and PdSe 2 ), but the stable lattice structure of the 2D NTMDs is largely depend on varying external parameters due to their strong interlayer interaction and relatively weaker covalent bond strength . Especially for PdS 2 and PdSe 2 , which exhibits puckered pentagonal network with a tilted Se–Se dumbbell passing through the Pd layer, leading to the lack of rotational symmetry and potential sensitivity to defects .…”

Section: Structure Of 2d Ntmdsmentioning

confidence: 99%

Recent Progress on 2D Noble‐Transition‐Metal Dichalcogenides

Liu

et al. 2019

Adv Funct Materials

225

166

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Emerging classes of 2D noble-transition-metal dichalcogenides (NTMDs) stand out for their unique structure and novel physical properties in recent years. With the nearly full occupation of the d orbitals, 2D NTMDs are expected to be more attractive due to the unique interlayer vibrational behaviors and largely tunable electronic structures compared to most transition metal dichalcogenide semiconductors. The novel properties of 2D NTMDs have stimulated various applications in electronics, optoelectronics, catalysis, and sensors. Here, the latest development of 2D NTMDs are reviewed from the perspective of structure characterization, preparation, and application. Based on the recent research, the conclusions and outlook for these rising 2D NTMDs are presented.Very recently, group-10 noble TMDs (NTMDs) have been reintroduced as new 2D materials, displaying many fascinating properties including widely tunable bandgap, moderate carrier mobility, anisotropy, and ultrahigh air stability. [34][35][36][37] Unlike most common TMDs with less d-electrons, the d orbitals of NTMDs are nearly fully occupied, and the corresponding p z orbital of interlayer chalcogen atoms are highly hybridized, leading to strong layer-dependent properties and interlayer interactions. [36,38] For example, it has been predicted that PtS 2 holds a layerdependent bandgap from 0.25 to 1.6 eV, [36] bridging the gap between graphene and most TMDs that with large gap. Besides, the calculated mobility based on PtS 2 , PtSe 2 , and PdSe 2 field effect transistors (FETs) is as high as ≈200 cm 2 V −1 s −1 , [36,37,39] larger than most other TMDs. Moreover, NTMDs possess high air stability, and the performance of the PtSe 2 FET remains nearly unchanged after 5 months air exposure. [37] Specially, PdS 2 and PdSe 2 hold novel puckered pentagonal structure and thus exhibit very interesting anisotropic properties, [39,40] which may bring even more physics and applications. Additionally, PtTe 2 and PdTe 2 are type-II Dirac fermions, making them great platform for investigating novel transport related to topological phase transition and chiral anomaly. [41,42] Nowadays, the 2D NTMDs is becoming increasingly fascinating in the 2D materials research.In this review, we highlight a comprehensive report of the recent research progress in 2D NTMDs such as PtS 2 , PtSe 2 , PdS 2 , PdSe 2 , PtTe 2 , and PdTe 2 . In order to understand the internal relation between structural characteristics and physical properties, this review begins with a brief summary of the structure of 2D NTMDs and their transitions. Then, some recent progress on their preparation methods, including mechanical exfoliation of the bulk materials, chemical vapor deposition (CVD), molecular beam epitaxy (MBE), is reviewed along with the performance of the resulting 2D NTMDs as high-performance candidate for field effect transistors, photodetectors, catalysis, and sensors. Finally, this review is concluded with the existing challenges and a future perspective for these rising 2D NTMDs. Structure of 2D NTM...

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“…Lastly, introducing chalcogen vacancies in PdSe 2 is interesting for phase transformations and resistive‐switching memory devices, because such defects have low diffusion barriers . Many selenium vacancies can lead to an “interlayer fusion”, as shown by Lin et al .…”

Section: Structures Of Layered Nm(d/p)csmentioning

confidence: 99%

Two‐Dimensional Noble‐Metal Chalcogenides and Phosphochalcogenides

2020

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Noble‐metal chalcogenides, dichalcogenides, and phosphochalcogenides are an emerging class of two‐dimensional materials. Quantum confinement (number of layers) and defect engineering enables their properties to be tuned over a broad range, including metal‐to‐semiconductor transitions, magnetic ordering, and topological surface states. They possess various polytypes, often of similar formation energy, which can be accessed by selective synthesis approaches. They excel in mechanical, optical, and chemical sensing applications, and feature long‐term air and moisture stability. In this Minireview, we summarize the recent progress in the field of noble‐metal chalcogenides and phosphochalcogenides and highlight the structural complexity and its impact on applications.

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3D Imaging and Manipulation of Subsurface Selenium Vacancies in PdSe2

Cited by 75 publications

References 44 publications

Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe₂ Ribbons

Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe₂ Ribbons

Recent Progress on 2D Noble‐Transition‐Metal Dichalcogenides

Two‐Dimensional Noble‐Metal Chalcogenides and Phosphochalcogenides

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3D Imaging and Manipulation of Subsurface Selenium Vacancies in PdSe2

Cited by 75 publications

References 44 publications

Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe2 Ribbons

Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe2 Ribbons

Recent Progress on 2D Noble‐Transition‐Metal Dichalcogenides

Two‐Dimensional Noble‐Metal Chalcogenides and Phosphochalcogenides

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Product

Resources

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Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe₂ Ribbons

Anisotropic Growth and Scanning Tunneling Microscopy Identification of Ultrathin Even‐Layered PdSe₂ Ribbons