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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing
Published on: June 1, 2012
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A green emissive carbon-dot-based sensor with diverse responsive manners for multi-mode sensing
Xiaohua Pan1, Yan Zhang, Xiaobo Sun
1College of Chemical and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, PR China. jpwang@qau.edu.cn.
The Analyst
|October 26, 2018
Summary
This study developed a single green carbon dot sensor for multi-analyte detection. The sensor utilizes diverse quenching mechanisms for selective sensing of Hg2+, lemon yellow dye, Fe2+, and H2O2 with high sensitivity.
Area of Science:
- Materials Science
- Analytical Chemistry
- Nanotechnology
Background:
- Carbon dots (CDs) offer tunable properties for sensing applications.
- Diverse quenching mechanisms enable multi-mode sensing with a single platform.
- Developing versatile sensors is crucial for environmental and biological monitoring.
Purpose of the Study:
- To synthesize green emissive carbon dots (CDs) for multi-mode sensing.
- To investigate the sensing mechanisms including photo-induced electron transfer (PET), inner filter effect (IFE), and oxidative quenching (OQ).
- To demonstrate the simultaneous detection of multiple analytes using a single CD-based sensor.
Main Methods:
- Green emissive carbon dots (CDs) were synthesized via hydrothermal pyrolysis of phenolphthalein and ethylenediamine.
- The responsive manners of CDs to Hg2+, lemon yellow dye, Fe2+, and H2O2 were investigated.
- Sensing mechanisms (PET, IFE, OQ) were elucidated based on experimental observations.
Main Results:
- The synthesized CDs exhibited a quantum yield of 17% and selective quenching by Hg2+ via PET.
- CDs showed a fluorescent response to lemon yellow dye due to IFE.
- Selective detection of Fe2+ and H2O2 was achieved through OQ via Fenton reaction, with detection limits as low as 1.2 μM and 1.1 μM, respectively.
- The sensor demonstrated linear detection ranges for Hg2+, lemon yellow, Fe2+, and H2O2 from 0.0-500.0, 0.0-20.0, 0.0-90.0, and 0.0-50.0 μM, respectively.
Conclusions:
- A single green emissive carbon dot-based sensor was successfully developed for multi-mode sensing.
- The sensor leverages diverse quenching mechanisms (PET, IFE, OQ) for selective and sensitive detection of Hg2+, lemon yellow dye, Fe2+, and H2O2.
- This work highlights the potential of carbon dots in developing advanced multi-analyte sensing platforms.
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