期刊
CARBON
卷 146, 期 -, 页码 728-735出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.02.030
关键词
Chemical sensors; Fluorescence sensors; Nanoparticles; Carbon nanostructures; Diagnosis
资金
- Thailand Research Fund [RSA6080006, RTA6080005]
- Thailand Research Fund (TRF) through the Royal Golden Jubilee (RGJ) Ph.D. Program [PHD/0081/2557]
- Research and Technology Transfer Affairs of Khon Kaen University
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Office of the Higher Education Commission, Ministry of Education
Carbon nanodots (CDs) were prepared by the pyrolysis of lactose in hot alkali solution for 5 min. The resulting CDs possess spherical and monodisperse shape with an average diameter of similar to 3 nm. The blue fluorescence of the CDs, with excitation/emission peaks at 414/470 nm, can be turned-on in the presence of very low concentrations of dopamine (DA) due to the formation of a poly-DA shell on the CDs. Fluorescence is only enhanced by DA, while other chemically related compounds do not interfere. Fluorescence increases linearly in the 1.0-10.0 mu M DA concentration range, with a 0.22 mu M lower detection limit. The nanoprobe was applied to the determination of DA in injections and in spiked urine samples, and the results compared well with those obtained by HPLC. The nanoprobe has a fast response, is inexpensive and highly selective. (c) 2019 Elsevier Ltd. All rights reserved.
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