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Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Related Experiment Video

Updated: Mar 11, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Core-shell structured CdTe/CdS@SiO₂ @CdTe@SiO₂ composite fluorescent spheres: Synthesis and application for Cd²⁺

Fang Liu¹, Shujia Li¹, Ruoxin Hu¹

¹College of Chemistry, Beijing Normal University, Beijing, People's Republic of China.

Luminescence : the Journal of Biological and Chemical Luminescence

|November 19, 2016

Summary

We developed a new fluorescent nanosphere probe for detecting cadmium ions (Cd2+). This probe uses core-shell quantum dots (QDs) encapsulated in silica, offering enhanced stability and a ratiometric

Keywords:

Cd2+ detection core-shell structure fluorescence quantum dots ratiometric

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Last Updated: Mar 11, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

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Published on: October 9, 2012

Area of Science:

Nanotechnology
Materials Science
Analytical Chemistry

Background:

Quantum dots (QDs) offer excellent optical properties, but often lack stability.
Silica encapsulation enhances nanoparticle stability and protects QDs.
Core-shell nanostructures combine the benefits of different materials for advanced applications.

Purpose of the Study:

To synthesize core-shell structured CdTe/CdS@SiO2@CdTe@SiO2 fluorescent nanospheres.
To develop a ratiometric 'off-on' fluorescent probe for sensitive and selective Cd2+ detection.
To investigate the sensing mechanism of the nanosphere probe for Cd2+.

Main Methods:

Multistep silica encapsulation using the Stöber method.
Synthesis of CdTe/CdS@SiO2@CdTe@SiO2 core-shell nanospheres.
Utilizing red-emissive (630 nm) and green-emissive (550 nm) CdTe QDs for ratiometric sensing.

Main Results:

The synthesized nanospheres exhibited enhanced optical stability due to the silica shell.
Cd2+ detection was achieved through a ratiometric 'off-on' fluorescence response.
The probe demonstrated high sensitivity and selectivity for Cd2+ detection.

Conclusions:

The developed CdTe/CdS@SiO2@CdTe@SiO2 nanosphere probe is effective for Cd2+ detection.
The sensing mechanism involves Cd2+-induced formation of a CdS-like cluster enhancing fluorescence.
The probe has potential applications in environmental and biological Cd2+ monitoring.