Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Colloidal precipitates01:09

Colloidal precipitates

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...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Emergent neuro-mimetic oscillations in engineered granular assemblies.

Materials horizons·2026
Same author

Correlated Incorporation and Structural Variability in Au-CdSe/CdS Plasmon-Exciton Hybrid Microspheres.

Chemphyschem : a European journal of chemical physics and physical chemistry·2026
Same author

Mid-infrared Intraband Transitions in InAs Colloidal Quantum Dots.

ACS nano·2026
Same author

Emergent Rashba spin-orbit coupling in bulk gold with buried network of nanoscale interfaces.

Science advances·2025
Same author

Interplay of Charge and Energy Transfer in Layered Quantum Dot Assemblies.

The journal of physical chemistry letters·2025
Same author

Characterization of Mid-Infrared HgTe Colloidal Quantum Dot Photodiodes.

ACS applied materials & interfaces·2025
Same journal

Erratum for the Research Article "Detecting supramolecular organic nanoparticles during heat wave".

Science (New York, N.Y.)·2026
Same journal

Local signals, systemic decline.

Science (New York, N.Y.)·2026
Same journal

The mechanics of liver regeneration.

Science (New York, N.Y.)·2026
Same journal

Computing in a memory with physics.

Science (New York, N.Y.)·2026
Same journal

Retraction.

Science (New York, N.Y.)·2026
Same journal

Making time.

Science (New York, N.Y.)·2026
See all related articles

Related Experiment Video

Updated: Jun 28, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Slow electron cooling in colloidal quantum dots.

Anshu Pandey1, Philippe Guyot-Sionnest

  • 1James Franck Institute, University of Chicago, 929 East 57th Street, Chicago, IL 60637, USA.

Science (New York, N.Y.)
|November 8, 2008
PubMed
Summary
This summary is machine-generated.

Researchers slowed hot electron energy loss in colloidal quantum dots to over one nanosecond. This breakthrough in quantum dot materials could enhance future infrared and photovoltaic devices.

More Related Videos

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Related Experiment Videos

Last Updated: Jun 28, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Mechanics

Background:

  • Hot electrons in semiconductors rapidly lose energy to lattice vibrations within picoseconds.
  • This rapid energy loss limits efficiency in optoelectronic devices like solar cells.
  • Quantum dots offer potential for slower energy relaxation due to their discrete electronic states, but this has been challenging to achieve.

Purpose of the Study:

  • To investigate and achieve slow intraband relaxation in colloidal quantum dots.
  • To explore the potential of quantum dots for improved energy dissipation control.
  • To identify methods for extending electron energy retention in quantum dot systems.

Main Methods:

  • Synthesized cadmium selenide (CdSe) quantum dots with a specific intraband energy separation (~0.25 eV).
  • Encapsulated the CdSe dots with an epitaxial zinc selenide (ZnSe) shell, passivated with a CdSe layer to eliminate electron traps.
  • Functionalized the surface with low-infrared-absorbance alkane thiol ligands.
  • Systematically varied the thickness of the ZnSe shell.

Main Results:

  • Achieved intraband relaxation times exceeding 1 nanosecond in the engineered colloidal quantum dots.
  • Observed a significant slowing of electron relaxation with increasing ZnSe shell thickness.
  • Demonstrated that a well-designed shell structure and passivation effectively minimizes competing energy loss mechanisms.

Conclusions:

  • Successfully demonstrated slow intraband relaxation in colloidal quantum dots by optimizing shell structure and passivation.
  • The findings suggest a viable pathway for controlling hot electron dynamics in quantum dots.
  • This work paves the way for developing next-generation photovoltaic and infrared devices with enhanced efficiency.