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Acid-assisted hydrothermal synthesis of red fluorescent carbon dots for sensitive detection of Fe(III)
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2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 65, p. 40952-40956Article in journal (Refereed) Published
Abstract [en]

Red-emitting carbon dots (C-dots) were synthesized from p-phenylenediamine (p-PD) aqueous solution with nitric acid (HNO3) assistance by hydrothermal reaction at 200 degrees C for 2 h. p-PD aqueous solution can be transferred to C-dots (or poly(p-PD)) with (or without) the addition of acid. Different acid systems, such as HNO3, H3PO4 and HF, can directly synthesize red-emitting C-dots, and the fluorescence can be enhanced by increasing the strength of acids. N-CDs, 3.46 nm-average-sized C-dots, prepared in dilute HNO3, have a quantum yield of 15.8% with unique, excitation-wavelength independent emission in the red region (600 and 680 nm) and a broad visible excitation band. Carboxyl, ester and hydroxyl groups on the C-dots surface directly lead to red emission. N-CDs have a certain selective specificity for Fe3+ detection and the linear range is 10-300 nmol L-1 with a limit of determination of 1.9 nmol L-1.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2017. Vol. 7, no 65, p. 40952-40956
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Organic Chemistry
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URN: urn:nbn:se:kth:diva-214912DOI: 10.1039/c7ra06223kISI: 000409096300033Scopus ID: 2-s2.0-85028360093OAI: oai:DiVA.org:kth-214912DiVA, id: diva2:1144899
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QC 2016-09-27

Available from: 2017-09-27 Created: 2017-09-27 Last updated: 2017-11-29Bibliographically approved

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He, Sailing

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School of Electrical Engineering (EES)Zhejiang-KTH Joint Research Center of Photonics, JORCEP
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