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Related Concept Videos

Redox Reactions01:24

Redox Reactions

59.3K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
59.3K
Redox Equilibria: Overview01:23

Redox Equilibria: Overview

1.7K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Related Experiment Video

Updated: Mar 16, 2026

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Selenium Redox Reactivity on Colloidal CdSe Quantum Dot Surfaces.

Emily Y Tsui1, Kimberly H Hartstein1, Daniel R Gamelin1

  • 1Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.

Journal of the American Chemical Society
|August 13, 2016
PubMed
Summary
This summary is machine-generated.

Researchers explored chemical reduction methods for cadmium selenide (CdSe) quantum dots (QDs). They found that a dark surface prereduction step, occurring at oxidized selenium sites, is crucial before photoexcitation for controlling QD properties.

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Area of Science:

  • Nanoscience
  • Materials Chemistry
  • Photochemistry

Background:

  • Midgap states in semiconductor nanocrystals are poorly understood.
  • Controlling the properties of colloidal quantum dots (QDs) is essential for their applications.

Purpose of the Study:

  • To investigate the origins of midgap states in CdSe QDs.
  • To explore chemical methods for controlling QD properties.

Main Methods:

  • Photochemical reduction of colloidal CdSe QDs using various reagents.
  • Mechanistic studies to elucidate the reaction pathway.

Main Results:

  • Identified a variety of reagents for QD reduction.
  • Established a dark surface prereduction step prior to photoexcitation.
  • Proposed that prereduction occurs at oxidized surface selenium sites.

Conclusions:

  • Small-molecule inorganic chemistries can control QD physical properties.
  • Provided microscopic insights into surface species and their reactivity.