Facile synthesis of cysteine–functionalized graphene quantum dots for a fluorescence probe for mercury ions

RSC Advances ◽  
2015 ◽  
Vol 5 (118) ◽  
pp. 97598-97603 ◽  
Author(s):  
Tran Van Tam ◽  
Soon Ho Hong ◽  
Won Mook Choi
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
Low Cost ◽  
Graphene Quantum Dots ◽  
Fluorescence Probes ◽  
Functionalized Graphene ◽  
Mercury Ions ◽  
Facile Synthesis ◽  
Highly Sensitive ◽  
Environmentally Friendly Method

We synthesized cystenine–functionalized graphene quantum dots (cys–GQDs) by a simple, low cost and environmentally friendly method and demonstrated them as highly sensitive and selective fluorescence probes for Hg2+ detection.

scholarly journals Fluorescence Probe Based on Graphene Quantum Dots for Selective, Sensitive and Visualized Detection of Formaldehyde in Food

2021 ◽  
Vol 13 (9) ◽  
pp. 5273
Author(s):  
Yanpeng Zhang ◽  
Junjie Qi ◽  
Mengying Li ◽  
Dong Gao ◽  
Chengfen Xing
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Fluorescence Probe ◽  
Graphene Quantum Dots ◽  
Complex Environment ◽  
Safety Testing ◽  
Highly Sensitive ◽  
Ph Range ◽  
Visualized Detection ◽  
Pure Aqueous Solution

Graphene quantum dots (GQDs) have been successfully used as a highly sensitive probe for the sensing of formaldehyde (HCHO) in an aqueous solution. Through static quenching, the probe utilizes the interaction between HCHO and GQDs to trigger the “turn off” fluorescence response, and has good selectivity. The probe can detect HCHO in a pure aqueous solution, and it also can still detect HCHO in a complex environment with a pH range from 4 to 10. The concentration of HCHO and the fluorescence intensity of GQDs show a good linear relationship within the range of HCHO of 0–1 μg/mL, which was much more sensitive than previous reports. The limit of HCHO detection by GQDs is about 0.0515 μg/mL. In addition, we successfully applied it to the actual food inspection. It is proved to be a selective, sensitive and visualized method to check whether the concentration of HCHO in the foods exceeds the regulatory limit, which presents a potential application in food safety testing.

scholarly journals Facile Synthesis of Formate-Functionalized Graphene Quantum Dots

2019 ◽  
Author(s):  
Jonathan Bruce ◽  
Jude Clapper
Keyword(s):  
Quantum Dots ◽  
Quantum Computing ◽  
Electrophilic Substitution ◽  
Structural Modification ◽  
Single Photon ◽  
Photon Emission ◽  
Graphene Quantum Dots ◽  
Functionalized Graphene ◽  
Single Photon Emission ◽  
Facile Synthesis

Graphene quantum dots have proven useful for a variety of applications due to their impressive bandgap tunability, which can be achieved through structural modification methods including edge functionalization and doping. Here, we investigate the functionalization of graphene quantum dots with formate esters using a method of noncatalyzed electrophilic substitution. We also examine the optical and structural properties of these formate-functionalized graphene quantum dots using UV-Vis Spectrophotometry, IR Spectroscopy, and NMR Spectroscopy, with the functionalization causing a redshift in absorption consistent with a reduction in bandgap. The findings in this paper have the potential to be used in applications ranging from single photon emission in quantum computing to tunable fluorescence in bioimaging.

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