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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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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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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Related Experiment Video

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Measurement of Ion Concentration in the Unstirred Boundary Layer with Open Patch-Clamp Pipette: Implications in Control of Ion Channels by Fluid Flow
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Defect Engineering in Single-Layer MoS2 Using Heavy Ion Irradiation.

Zuyun He1, Ran Zhao2, Xiaofei Chen3

  • 1Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy , South China University of Technology , Guangzhou 510006 , China.

ACS Applied Materials & Interfaces
|November 15, 2018
PubMed
Summary
This summary is machine-generated.

Controlled sulfur vacancies were introduced into molybdenum disulfide (MoS2) using ion irradiation. These defects significantly altered MoS2

Keywords:
MoS2PLRamandefect engineeringion beam

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Transition metal dichalcogenides (TMDs) exhibit remarkable optical, electronic, magnetic, and catalytic properties.
  • Defect engineering in TMDs is crucial for developing advanced functionalities and enhancing device performance.
  • Controllable defect creation and understanding their structure-property relationships remain significant challenges.

Purpose of the Study:

  • To investigate the impact of controlled defect densities on the properties of single-layer molybdenum disulfide (MoS2).
  • To establish a correlation between defect nature and the resulting functionalities in MoS2.
  • To explore the potential of defect engineering for improving MoS2-based applications.

Main Methods:

  • Generation of controlled defect densities in single-layer MoS2 using 500 keV Au irradiation at various ion fluences.
  • Characterization of introduced defects, primarily sulfur vacancies.
  • Analysis of changes in photoluminescence characteristics and electrocatalytic behavior of MoS2 with varying defect densities.

Main Results:

  • Ion irradiation successfully introduced sulfur vacancies in MoS2 with controllable densities.
  • Photoluminescence spectra of MoS2 showed a blueshift followed by a redshift with increasing defect density, attributed to electron transfer with adsorbed oxygen.
  • Hydrogen evolution reaction activity of MoS2 was significantly enhanced due to defect-induced modifications in atomic hydrogen adsorption.

Conclusions:

  • Controlled introduction of sulfur vacancies via ion irradiation is an effective strategy for tuning MoS2 properties.
  • Defect engineering in MoS2 can lead to significant improvements in photoluminescence and electrocatalytic performance.
  • The study provides insights into defect-property correlations, paving the way for tailored MoS2-based devices.