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Related Experiment Video

Updated: Dec 26, 2025

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

Surface Plasmon-Enhanced Optical Formaldehyde Sensor Based on CdSe@ZnS Quantum Dots.

Sheng Xue^1,2,3, Xiao-Fang Jiang^2,3, Geng Zhang⁴

¹College of Biophotonics, South China Normal University, Guangzhou 510006, China.

|March 18, 2020

Summary

This summary is machine-generated.

A novel optical sensor using quantum dots and gold nanoparticles detects formaldehyde gas. This sensor offers a rapid, sensitive, and low-cost method for environmental formaldehyde monitoring.

Keywords:

fluorescence quenching optical formaldehyde sensors plasmon-enhanced fluorescence quantum dots reproducibility

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Last Updated: Dec 26, 2025

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

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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

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Published on: July 19, 2016

Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Formaldehyde is a hazardous air pollutant requiring sensitive detection methods.
Existing formaldehyde detection techniques often lack speed, sensitivity, or convenience.
Optical sensors offer potential for real-time, non-invasive monitoring.

Purpose of the Study:

To develop a reproducible surface plasmon-enhanced optical sensor for gaseous formaldehyde.
To achieve rapid, sensitive, and convenient formaldehyde detection.
To explore the use of quantum dots and gold nanoparticles for enhanced optical sensing.

Main Methods:

Fabrication of a sensor by depositing CdSe@ZnS quantum dots (QDs), fumed silica (FS), and gold nanoparticles (GNs) on a silica sphere array.
Utilizing spectral overlap between QDs and GNs to achieve plasmon-enhanced fluorescence.
Investigating the fluorescence quenching mechanism upon exposure to formaldehyde.

Main Results:

Observed plasmon-enhanced fluorescence in the QDs/FS/GNs film.
Demonstrated linear fluorescence quenching with formaldehyde concentration from 0.5-2.0 ppm.
Attributed quenching to nonradiative electron transfer from QDs to formaldehyde facilitated by amino groups.

Conclusions:

The designed sensor effectively detects ultralow concentrations of gaseous formaldehyde at room temperature.
The sensor exhibits fast response-recovery times, high selectivity, stability, and reproducibility.
This work presents a simple, low-cost approach for optical formaldehyde sensor fabrication with promising environmental applications.