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Highly photoluminescent and stable n-doped carbon dots as nanoprobes for Hg2+ detection

Rao, L.; Tang, Y.; Lu, H.; Yu, S. 1; Ding, X.; Xu, K.; Li, Z.; Zhang, J. Z.
1 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)


We developed a microreactor with porous copper fibers for synthesizing nitrogen-doped carbon dots (N-CDs) with a high stability and photoluminescence (PL) quantum yield (QY). By optimizing synthesis conditions, including the reaction temperature, flow rate, ethylenediamine dosage, and porosity of copper fibers, the N-CDs with a high PL QY of 73% were achieved. The PL QY of N-CDs was two times higher with copper fibers than without. The interrelations between the copper fibers with different porosities and the N-CDs were investigated using X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). The results demonstrate that the elemental contents and surface functional groups of N-CDs are significantly influenced by the porosity of copper fibers. The N-CDs can be used to effectively and selectively detect Hg2+ ions with a good linear response in the 0~50 μM Hg2+ ions concentration range, and the lowest limit of detection (LOD) is 2.54 nM, suggesting that the N-CDs have great potential for applications in the fields of environmental and hazard detection. Further studies reveal that the different d orbital energy levels of Hg2+ compared to those of other metal ions can affect the efficiency of electron transfer and thereby result in their different response in fluorescence quenching towards N-CDs.

Verlagsausgabe §
DOI: 10.5445/IR/1000087871
DOI: 10.3390/nano8110900
Zitationen: 50
Zitationen: 54
Cover der Publikation
Zugehörige Institution(en) am KIT Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000087871
Erschienen in Nanomaterials
Verlag MDPI
Band 8
Heft 11
Seiten Art. Nr.: 900
Schlagwörter microreactor, carbon dots, porous copper fibers, Hg2+ detection
Nachgewiesen in Dimensions
Web of Science
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