文献类型：期刊文献

英文题名：Dramatic photoluminescence quenching in carbon dots induced by cyclic voltammetry

作者：Tian, Y.[1];Li, L.[1];Guo, X.[1];Wojtowicz, A.[2];Estevez, L.[3];Krysmann, M. J.[4];Kelarakis, A.[5]

机构：[1]ECUST, Shanghai, Peoples R China;[2]Jagiellonian Univ Krakow, Chem Dept, Krakow, Poland;[3]Pacific Northwest Natl Lab, Richland, WA USA;[4]Univ Cent Lancashire, Sch Pharm & Biosci, Preston PR1 2HE, Lancs, England;[5]Univ Cent Lancashire, Sch Phys Sci & Comp, Preston PR1 2HE, Lancs, England

年份：2018

卷号：54

期号：65

起止页码：9067

外文期刊名：CHEMICAL COMMUNICATIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000441148300024)】；

基金：Y. T. acknowledges financial support from the China Scholarship Council (201503780053) to work in Preston within the framework of "Newton Fund PhD Placement Grant''. A. W. acknowledges financial support from Erasmus Plus to work in Preston.

语种：英文

摘要：This study focuses on the structural rearrangements and the photo-luminescent behavior of pyrolytically derived carbon dots when subjected to a series of cyclic voltammetry sweeps. Although the electrical signals involved are not pronounced, multiple electrochemical cycling results in a progressive suppression of the photoluminescence, so that after 42 sweeps the intensity is reduced by one order of magnitude. At the same time, the fluorescence component stemming from the organic fluorophores is blue-shifted, while the contribution of the carbogenic cores is red-shifted. XPS and FTIR spectra reveal that the voltammetric field induces an extensive formation of C-O and C=O at the expense of the C=C bonds. Our findings indicate a close relationship between the electrochemical response and the structure of C-dots and, thus, have direct implications on the development of C-dot based electroluminescent materials, electrochemical sensors and solar cells.