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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Production and Targeting of Monovalent Quantum Dots
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Conduction Band Fine Structure in Colloidal HgTe Quantum Dots.

Margaret H Hudson, Menglu Chen, Vladislav Kamysbayev

  • 1University of Lille, CNRS, Centrale Lille, ISEN, University of Valenciennes , UMR 8520 - IEMN, F-59000 Lille , France.

ACS Nano
|August 21, 2018
PubMed
Summary

Highly monodisperse mercury telluride (HgTe) colloidal quantum dots (QDs) were synthesized and doped. Electron-doped HgTe QDs exhibit unique intraband transitions, revealing insights into spin-orbit coupling effects.

Keywords:
colloidal quantum dotsdopingelectronic structureinfraredspectroelectrochemistry

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Nanotechnology

Background:

  • Mercury telluride (HgTe) colloidal quantum dots (QDs) offer tunable infrared bandgaps due to quantum confinement.
  • Controlling the doping of HgTe QDs is crucial for their optoelectronic applications.

Purpose of the Study:

  • To synthesize highly monodisperse HgTe QDs.
  • To tune the doping of HgTe QDs chemically and electrochemically.
  • To investigate the electronic transitions and fine structure in electron-doped HgTe QDs.

Main Methods:

  • Synthesis of highly monodisperse HgTe QDs.
  • Small-angle X-ray scattering (SAXS) for monodispersity evaluation.
  • Chemical and electrochemical doping.
  • Spectroelectrochemical studies.
  • Theoretical modeling.

Main Results:

  • Monodisperse HgTe QDs with ~10% diameter distribution were synthesized.
  • Electron-doped HgTe QDs showed intraband absorbance and bleaching of excitonic features.
  • Splitting of intraband peaks was observed, corresponding to transitions from 1Se to 1Pe states.
  • The splitting and intensity remained constant up to two electrons per QD.
  • Theoretical modeling attributed peak splitting to spin-orbit coupling and reduced QD symmetry.

Conclusions:

  • The size uniformity and strong spin-orbit coupling in HgTe QDs enable observation of fine intraband transition structures.
  • Understanding these transitions is key for developing novel infrared optoelectronic devices.