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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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Measuring how one directional quantity affects another along a specific path involves comparing their orientation and strength. When two such quantities are represented using direction and amount, a numerical result is computed to show how much one acts along the path of the other. This result comes from a rule combining both inputs' horizontal and vertical parts and adding the results.This calculation gives a single value that grows larger when both inputs point in similar directions and...
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Silicon quantum dots with heavily boron and phosphorus codoped shell.

Minoru Fujii1, Hiroshi Sugimoto, Shinya Kano

  • 1Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan. fujii@eedept.kobe-u.ac.jp.

Chemical Communications (Cambridge, England)
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Summary

Ligand-free silicon quantum dots (QDs) codoped with boron and phosphorus demonstrate water dispersibility and near-infrared luminescence. These novel QDs are utilized to form various nanocomposites.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Chemistry

Background:

  • Silicon quantum dots (QDs) are promising nanomaterials.
  • Organic ligands are typically required for QD water dispersibility.
  • Near-infrared (NIR) luminescence is valuable for various applications.

Purpose of the Study:

  • To synthesize and characterize heavily boron and phosphorus codoped silicon QDs.
  • To investigate their water dispersibility without organic ligands.
  • To explore their NIR luminescence properties and nanocomposite formation.

Main Methods:

  • Synthesis of boron and phosphorus codoped silicon QDs.
  • Characterization of QD properties (e.g., size, composition, optical).
  • Demonstration of nanocomposite formation using the QDs.

Main Results:

  • Successfully synthesized ligand-free silicon QDs codoped with boron and phosphorus.
  • Achieved stable aqueous dispersibility of the silicon QDs.
  • Observed near-infrared luminescence from the QDs.
  • Demonstrated the formation of diverse nanocomposites incorporating these QDs.

Conclusions:

  • Heavily boron and phosphorus codoped silicon QDs offer a route to ligand-free, water-dispersible nanomaterials.
  • These QDs exhibit useful near-infrared luminescence.
  • The developed QDs are versatile building blocks for creating novel nanocomposites.