Nitrogen-doped graphdiyne quantum-dots as an optical-electrochemical sensor for sensitive detection of dopamine

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dc.contributor.authorBai, Qiang
dc.contributor.authorLuo, Hongyang
dc.contributor.authorYi, Xuetao
dc.contributor.authorShi, Shugao
dc.contributor.authorWang, Lina
dc.contributor.authorLiu, Manhong
dc.contributor.authorDu, Fanglin
dc.contributor.authorYang, Zhugen
dc.contributor.authorSui, Ning
dc.date.accessioned2022-05-03T13:24:32Z
dc.date.available2022-05-03T13:24:32Z
dc.date.issued2022-04-22
dc.description.abstractGraphdiyne quantum dots (GDQDs) have attracted increasing attentions due to its unique electronic, optical, and electrochemical properties. However, the low conductivity and quantum yield of GDQDs limit their application. Here, nitrogen-doped graphdiyne dots (N-GDQDs) are firstly synthesized by a simple, friendly and one-step hydrothermal method. The N-GDQDs show a maximum emission at 410 nm under the excitation wavelength of 319 nm. The doping N modifies the surface defect of N-GDQDs and further greatly improves their quantum yield (from 14.6% to 48.6%). In addition, the doping N induces a strong electron transport ability and good conductivity of N-GDQDs. Subsequently, the prepared N-GDQDs are used for constructing an optical-electrochemical nanosensor for sensitive and selective detection of dopamine (DA). DA can quench the fluorescence of N-GDQDs by forming a ground-state non-fluorescent complex between phenoxy anions (in PBS solution) in DA and pyridinic N sites of N-GDQDs, which leads to a highly sensitive and selective detection of DA with a limit of detection (LOD) of 0.14 μM and a linear range of 0.32–500 μM. In the electrochemical detection, DA can be oxidized to DA-quinone under the electric field through N-GDQDs/GCE, which shows a big affinity to N-GDQDs. The LOD for DA is 0.02 μM with a linear range of 0.05–240 μM. Finally, the spiked application for DA detection in human serum samples is investigated, the results show that the method has high accuracy. Our work provides a new carbon quantum dots based sensing platform, which shows great potential in practical application.en_UK
dc.identifier.citationBai Q, Luo H, Yi X, et al., (2022) Nitrogen-doped graphdiyne quantum-dots as an optical-electrochemical sensor for sensitive detection of dopamine. Microchemical Journal, Volume 179, August 2022, Article number 107521en_UK
dc.identifier.issn0026-265X
dc.identifier.urihttps://doi.org/10.1016/j.microc.2022.107521
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/17844
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectGraphdiyne dotsen_UK
dc.subjectNitrogen-dopeden_UK
dc.subjectFluorescenceen_UK
dc.subjectElectrochemicalen_UK
dc.subjectDopamineen_UK
dc.titleNitrogen-doped graphdiyne quantum-dots as an optical-electrochemical sensor for sensitive detection of dopamineen_UK
dc.typeArticleen_UK

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