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Related Experiment Video

Updated: Feb 12, 2026

Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals

Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals

Published on: December 11, 2013

Heterostructure-Controlled Charge Transfer Dynamics in CdSe/CdS Dot-in-Rods and Tetrapods.

Samantha M Harvey¹, Florence Y Dou¹, Elise Skytte¹

¹Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States.

|February 11, 2026

Summary

Branched tetrapod quantum dots show slower hole transfer but significantly longer charge separation, making them promising for efficient photocatalysis.

Keywords:

carrier dynamics charge transfer dot-in-rod heterostructure tetrapod transient absorption

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Area of Science:

Materials Science
Photocatalysis
Quantum Dot Research

Background:

Heterostructured quantum dots (QDs) are crucial for photocatalysis.
Understanding morphology's impact on charge transfer is vital.
CdSe/CdS dot-in-rods and tetrapods offer distinct morphologies.

Purpose of the Study:

To compare charge transfer dynamics in CdSe/CdS dot-in-rods and tetrapods.
To investigate the influence of QD morphology on photocatalytic performance.
To elucidate excited state dynamics and charge separation behavior.

Main Methods:

Synthesis of quasi-type-II CdSe/CdS dot-in-rods and tetrapods from a common CdSe core.
Utilizing transient absorption spectroscopy (TAS) for excited state dynamics analysis.
Examining charge transfer kinetics and charge-separated state lifetimes.

Main Results:

Hole transfer from CdS to CdSe was 3-6 times slower in tetrapods versus dot-in-rods.
Slower hole transfer in tetrapods is attributed to hole hopping between CdS arms.
Electron transfer rates to benzoquinone were similar for both heterostructures.
Charge-separated state lifetime in tetrapods was over an order of magnitude longer.
Steric constraints in tetrapods likely inhibit charge recombination.

Conclusions:

Tetrapod morphology enhances charge separation lifetime without compromising transfer kinetics.
Branched tetrapods show potential as superior photocatalysts for light-driven reactions.
Morphology-dependent charge dynamics are key to optimizing QD photocatalyst design.