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Related Concept Videos

Electrophilic Addition to Alkynes: Hydrohalogenation02:35

Electrophilic Addition to Alkynes: Hydrohalogenation

Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
Inductive Effects on Chemical Shift: Overview01:27

Inductive Effects on Chemical Shift: Overview

The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

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Engineering Hydrogen Halide Leak Sensing on Metal-Modified InSe Monolayers: Distinct Roles of Mo and W.

Feng Yang1, Yongfa Peng1, Yingang Gui1

  • 1College of Engineering and Technology, Southwest University, Chongqing 400715, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

Metal-decorated Indium Selenide (InSe) monolayers show promise as sensors for detecting corrosive hydrogen halides (HCl, HBr, HI). Modified InSe offers tunable adsorption-desorption for efficient gas sensing applications.

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Corrosive hydrogen halides (HCl, HBr, HI) present significant industrial risks.
  • Effective sensors require materials with balanced gas adsorption and desorption properties.

Purpose of the Study:

  • To investigate the hydrogen halide sensing capabilities of pristine and transition metal-decorated Indium Selenide (InSe) monolayers.
  • To evaluate the impact of Iridium (Ir), Molybdenum (Mo), and Tungsten (W) decoration on InSe's sensing performance.

Main Methods:

  • Utilized first-principles calculations to systematically study InSe monolayer interactions with hydrogen halides.
  • Analyzed binding energies, adsorption distances, and electronic responses upon gas adsorption.
  • Calculated recovery times for sensor reusability at room temperature and under moderate heating.

Main Results:

  • Transition metal decoration significantly enhanced hydrogen halide adsorption on InSe.
  • Molybdenum-decorated InSe (Mo-InSe) demonstrated optimal performance for HBr and HI detection with fast room-temperature recovery.
  • Tungsten-decorated InSe (W-InSe) exhibited strong adsorption for all three gases and suitable heat-assisted recovery.

Conclusions:

  • Metal-modified InSe monolayers provide a tunable platform for hydrogen halide gas sensing.
  • The developed materials support both reusable room-temperature and heat-assisted recovery sensing applications.