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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.1K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.1K
SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

10.2K
An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
10.2K
Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.7K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
6.7K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

2.0K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.0K
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

8.8K
Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
8.8K
Halogenation of Alkenes02:46

Halogenation of Alkenes

16.5K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
16.5K

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Updated: Sep 18, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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A Strategy for Transition Metal Chalcogenide Synthesis Using Sequential Selenium Substitution.

Jun Wang1, Yunxia Hu1,2, Hongwei Liu1

  • 1Department of Chemical and Biological Engineering, Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology, William Mong Institute of Nano Science and Technology and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, P. R. China.

Nano Letters
|June 25, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized diverse transition metal dichalcogenides (TMDs) and heterostructures using single-crystal molybdenum ditelluride (MoTe₂) as a template. This novel method yields high-performance molybdenum diselenide (MoSe₂) for semiconductor applications.

Keywords:
chalcogen substitutionheterostructuresnear infrared photodetectionsingle crystalvan der Waals materials

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Direct synthesis of wafer-scale single-crystal transition metal dichalcogenides (TMDs) is challenging.
  • TMDs have significant potential applications in semiconductors.

Purpose of the Study:

  • To demonstrate a novel method for synthesizing various TMDs and heterostructures.
  • To explore the synthesis of molybdenum ditelluride/molybdenum diselenide (MoTe₂/MoSe₂) lateral heterostructures.
  • To investigate the mechanism of selenium substitution in MoTe₂.

Main Methods:

  • Utilized single-crystal 2H-MoTe₂ films as templates.
  • Employed a sequential selenium substitution reaction.
  • Performed computational modeling to understand the substitution mechanism.
  • Synthesized MoTe₂/MoSe₂ lateral heterostructures at varying temperatures.

Main Results:

  • Successfully synthesized various TMDs and heterostructures.
  • Demonstrated the synthesis of MoTe₂/MoSe₂ lateral heterostructures with controlled substitution.
  • Computational results indicated a chain reaction mechanism for selenium substitution initiated at Te vacancy sites.
  • Achieved high hole mobility (32 cm² V⁻¹ s⁻¹) in synthesized MoSe₂.
  • Developed a MoSe₂-based photodetector with comparable responsivity (41 mA W⁻¹) under near-infrared illumination.

Conclusions:

  • Single-crystal MoTe₂ templates enable versatile synthesis of TMDs and heterostructures.
  • The selenium substitution process is governed by a strain-mediated chain reaction.
  • The synthesized MoSe₂ exhibits excellent electronic and optoelectronic properties, suitable for semiconductor devices.