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Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Ionization Energy03:12

Ionization Energy

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The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
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Discovery of Type II Interlayer Trions.

Linglong Zhang1, Fei Zhou2, Xiaowei Zhang3

  • 1College of Physics, Nanjing University of Aeronautics and Astronautics, Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT, Nanjing, 211106, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 14, 2022
PubMed
Summary
This summary is machine-generated.

Researchers report the first observation of elusive Type II interlayer trions in atomically thin organic-inorganic van der Waals heterostructures. These findings advance the development of novel excitonic devices and all-optical circuits.

Keywords:
Coulomb interactionsanisotropic emissionatomically thin organic-inorganic heterostructurespositive and negative trionstype II interlayer trions

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Electronic excitations in van der Waals heterostructures (vdWHs) include Type I and Type II interlayer trions.
  • Type I interlayer trions are well-studied, but Type II remain elusive due to challenges like poor interface quality and unsuitable band alignment.

Purpose of the Study:

  • To report the first observation of Type II interlayer trions in vdWHs.
  • To explore the electrical tunability and optical properties of Type II interlayer trions.
  • To investigate the potential of organic-inorganic bilayers for excitonic devices.

Main Methods:

  • Utilized a monolayer WSe2/bilayer pentacene heterostructure (1L + 2L HS) with specific band alignments.
  • Employed photoluminescence (PL) spectroscopy to observe and analyze trions.
  • Investigated electrical tuning of positive and negative Type II interlayer trions.

Main Results:

  • Achieved the first observation of both positive and negative Type II interlayer trions.
  • Demonstrated electrical tunability of these trions via PL spectroscopy.
  • Observed in-plane anisotropic emission from Type II interlayer trions, linked to pentacene's transition dipole moment.

Conclusions:

  • The study successfully observed and characterized Type II interlayer trions in an organic-inorganic vdWH system.
  • The anisotropic emission properties offer insights into charge interactions and spatial structure.
  • These findings open avenues for developing advanced excitonic devices and all-optical circuits.