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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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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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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Transiciones Intrabanda de Infrarrojo Medio en Puntos Cuánticos Coloidales de InAs

Shraman Kumar Saha1, Philippe Guyot-Sionnest1

  • 1Department of Chemistry, and the James Franck Institute, The University of Chicago, 929 E 57th Street, 60637, Chicago, Illinois 60653, United States.

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Resumen
Este resumen es generado por máquina.

Los puntos cuánticos coloidales (CQD) III-V muestran potencial para aplicaciones de infrarrojo medio. El dopaje n estable de CQDs de InAs/InP permite transiciones intrabanda para detectores y emisores.

Palabras clave:
III-VInAsInPpuntos cuánticos coloidalesnúcleo/cubiertafotoluminiscencia intrabandaespectroelectroquímica

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Área de la Ciencia:

  • Ciencia de Materiales
  • Tecnología de Puntos Cuánticos
  • Espectroscopía Infrarroja

Sus antecedentes:

  • Los puntos cuánticos coloidales (CQDs) se exploran para aplicaciones de infrarrojo visible a infrarrojo de onda corta.
  • Lograr un dopaje n estable en CQDs es crucial para las transiciones intrabanda de infrarrojo medio.

Objetivo del estudio:

  • Investigar las transiciones intrabanda de infrarrojo medio en CQDs de InAs, InAs/InP e InAs/ZnSe.
  • Explorar el potencial de los CQDs para la detección y emisión de infrarrojo medio.

Principales métodos:

  • Se utilizó electroquímica para estudiar películas de puntos cuánticos.
  • Se analizó la movilidad resuelta por estado, el llenado de electrones y la absorción intrabanda.
  • Se caracterizaron CQDs de InAs, InAs/InP e InAs/ZnSe con un espacio de energía de 1,4 μm.

Principales resultados:

  • Movilidad resuelta por estado, llenado de electrones y absorción intrabanda (3-8 μm) observados en películas de CQD.
  • Potenciales electroquímicos específicos determinados para dopaje n de InAs/ZnSe e InAs/InP.
  • Dopaje n estable del estado 1Se en CQDs de InAs/InP logrado, mostrando absorción intrabanda (3-5 μm) y luminiscencia (5 μm).

Conclusiones:

  • Los CQDs de InAs/InP exhiben dopaje n estable y transiciones intrabanda de infrarrojo medio.
  • Estos CQDs ofrecen baja toxicidad, alta estabilidad térmica y son prometedores para aplicaciones de infrarrojo medio.