High Temperature X-Ray Study of the Thermal Expansion of PtS2, PtSe2, PtTe2 and PdTe2.

Kjekshus, Arne; Grønvold, Fredrik; Jørgensen, Peer Møller; Refn, Susanne

doi:10.3891/acta.chem.scand.13-1767

Cited by 57 publications

(38 citation statements)

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“…Noble‐metal chalcogenides (NMCs) have been known since the 19th Century . In contrast, their dichalcogenide forms (NMDCs: MX 2 , M=Pd, Pt, X=S, Se, Te) were well‐characterized only in the 20th Century by the groups of Grønvold and Hulliger . Many NMDCs, for example, PtSe 2 and PdTe 2 , and also some of the less‐well‐known noble‐metal phosphochalcogenides (NMPCs), are layered materials.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

Two‐Dimensional Noble‐Metal Chalcogenides and Phosphochalcogenides

2020

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“…The pioneering work by Grønvold et al indicates that the noble metals Pt and Pd can form layered structures with S atoms. [14][15][16] These monolayer noble-transition-metal disuldes MS 2 (M ¼ Pt and Pd) are typical semiconductors with indirect band gaps of 1.75 eV for PtS 2 and 1.11 eV for PdS 2 . 17 The PtS 2 crystal has a layer-dependent indirect bandgap from 1.6 eV (monolayer) to 0.25 eV (bulk).…”

Section: Introductionmentioning

confidence: 99%

Robust quasi-ohmic contact against angle rotation in noble transition-metal-dichalcogenide/graphene heterobilayers

Hou

Han

et al. 2017

RSC Adv.

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Stacked 2D crystals provide great possibilities to achieve desired functionalities with varying thickness and composition properties. In this work, the electronic properties of heterobilayers of noble transition-metaldichalcogenide (PdS 2 , PtS 2 )/graphene with interlayer rotation angles are systematically investigated by density functional theory calculations. The two layers are combined by weak van der Waals interactions. Each component preserves its band structure in the hybrid system. A charge transference occurs at the interface of the bilayers leading to p-type doping for graphene and n-type doping for PdS 2 (PtS 2 ).Schottky barriers ranging from 0 eV to 0.057 eV appear in both heterobilayers with different orientations between the two monolayers. These results suggest that PdS 2 (PtS 2 )/graphene heterobilayers have quasi-ohmic contact against interface angle rotation.

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“…[15,17,35] Isoelectronic 2H-WSe 2 shows similar effects as 2H-MoS 2 , but more pronounced spin-orbit splitting of ≈450 meV. [15,35] Finally, 1T-PtSe 2 [36,37] shows extreme quantum confinement with metal-semiconductor transition when going from bulk to the monolayer. [38,39] We restrict our calculations to one intercalate, methylamine (MeNH 2 ), which is the shortest possible surfactant with an amine group.…”

Section: Doi: 101002/smll201803910mentioning

confidence: 99%

2D Crystals in Three Dimensions: Electronic Decoupling of Single‐Layered Platelets in Colloidal Nanoparticles

Kempt

Kuc

Han

et al. 2018

Small

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2D crystals, single sheets of layered materials, often show distinct properties desired for optoelectronic applications, such as larger and direct band gaps, valley‐ and spin‐orbit effects. Being atomically thin, the low amount of material is a bottleneck in photophysical and photochemical applications. Here, the formation of stacks of 2D crystals intercalated with small surfactant molecules is proposed. It is shown, using first principles calculations, that the very short surfactant methyl amine electronically decouples the layers. The indirect–direct band gap transition characteristic for Group 6 transition metal dichalcogenides is demonstrated experimentally by observing the emergence of a strong photoluminescence signal for ethoxide‐intercalated WSe2 and MoSe2 multilayered nanoparticles with lateral size of about 10 nm and beyond. The proposed hybrid materials offer the highest possible density of the 2D crystals with electronic properties typical of monolayers. Variation of the surfactant's chemical potential allows fine‐tuning of electronic properties and potentially elimination of trap states caused by defects.

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High Temperature X-Ray Study of the Thermal Expansion of PtS2, PtSe2, PtTe2 and PdTe2.

Cited by 57 publications

References 0 publications

Two‐Dimensional Noble‐Metal Chalcogenides and Phosphochalcogenides

Two‐Dimensional Noble‐Metal Chalcogenides and Phosphochalcogenides

Robust quasi-ohmic contact against angle rotation in noble transition-metal-dichalcogenide/graphene heterobilayers

2D Crystals in Three Dimensions: Electronic Decoupling of Single‐Layered Platelets in Colloidal Nanoparticles

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