Blue photoluminescent carbon nanodots from limeade

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Author list: Suvarnaphaet P., Tiwary C.S., Wetcharungsri J., Porntheeraphat S., Hoonsawat R., Ajayan P.M., Tang I.-M., Asanithi P.

Publisher: Elsevier

Publication year: 2016

Journal: Materials Science and Engineering: C (0928-4931)

Volume number: 69

Start page: 914

End page: 921

Number of pages: 8

ISSN: 0928-4931

eISSN: 1873-0191

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84980360938&doi=10.1016%2fj.msec.2016.07.075&partnerID=40&md5=985a65b02e701b6962c78f328a75adf4

Languages: English-Great Britain (EN-GB)

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Abstract

Carbon-based photoluminescent nanodot has currently been one of the promising materials for various applications. The remaining challenges are the carbon sources and the simple synthetic processes that enhance the quantum yield, photostability and biocompatibility of the nanodots. In this work, the synthesis of blue photoluminescent carbon nanodots from limeade via a single-step hydrothermal carbonization process is presented. Lime carbon nanodot (L-CnD), whose the quantum yield exceeding 50% for the 490 nm emission in gram-scale amounts, has the structure of graphene core functionalized with the oxygen functional groups. The micron-sized flake of the as-prepared L-CnD powder exhibits multicolor emission depending on an excitation wavelength. The L-CnDs are demonstrated for rapidly ferric-ion (Fe3 +) detection in water compared to Fe2 +, Cu2 +, Co2 +, Zn2 +, Mn2 + and Ni2 + ions. The photoluminescence quenching of L-CnD solution under UV light is used to distinguish the Fe3 + ions from others by naked eyes as low concentration as 100 μM. Additionally, L-CnDs provide exceptional photostability and biocompatibility for imaging yeast cell morphology. Changes in morphology of living yeast cells, i.e. cell shape variation, and budding, can be observed in a minute-period until more than an hour without the photoluminescent intensity loss. © 2016 Elsevier B.V.

Keywords

Blue photoluminescence, Carbon nanodots, Cell imaging, Ferric-ion detection, Hydrothermal carbonization