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Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays

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Multi-component determination based on high quantum yield "on-off-on" carbon quantum dots sensor.

Xiang Li¹, Jun Wu¹, Xiashi Zhu¹

¹College of Chemistry and Chemical Engineering, College of Guangling, Yangzhou University, Yangzhou 225002, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

|November 20, 2023

Summary

Nitrogen-sulfur-sodium co-doped carbon quantum dots (CQDs) offer a highly fluorescent "on-off-on" sensor. This sensor can detect multiple analytes, showing great potential for drug detection applications.

Keywords:

Arginine Ascorbic acid Carbon quantum dots Fe(III)Fluorescence “on-off-on” sensor Histidine

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Area of Science:

Materials Science
Analytical Chemistry
Nanotechnology

Background:

Carbon quantum dots (CQDs) are emerging nanomaterials with unique optical properties.
Developing sensitive and selective sensors for multiple analytes is crucial in various fields, including drug detection.
Fluorescence-based sensing offers advantages like high sensitivity and real-time monitoring.

Purpose of the Study:

To synthesize novel nitrogen(N)-sulfur(S)-sodium(Na(I)) co-doped CQDs.
To construct a fluorescence "on-off-on" sensor for detecting multiple analytes.
To investigate the sensing mechanism and evaluate the sensor's performance.

Main Methods:

One-step hydrothermal synthesis of N, S, Na(I)-co-doped CQDs.
Fabrication of a fluorescence "on-off-on" sensor.
Quenching of CQDs fluorescence by Fe(III) and recovery by ascorbic acid (Asc), arginine (Arg), and histidine (His).
Spectroscopic analysis to study the fluorescence mechanism.

Main Results:

The synthesized CQDs exhibited a high fluorescence quantum yield (24.58%) and excellent optical properties.
The sensor showed rapid response, high sensitivity, stability, selectivity, and anti-interference capabilities.
Simultaneous determination of multiple analytes was achieved with satisfactory recovery rates.
The "on-off-on" fluorescence mechanism was elucidated.

Conclusions:

N, S, Na(I)-co-doped CQDs are promising fluorescent materials for sensor development.
The developed CQDs fluorescence sensor is effective for simultaneous multi-analyte detection.
Carbon nano-functionalized materials hold significant potential for drug detection via fluorescence sensing.