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Sensors and actuators. B, Chemical v.259, 2018년, pp.211 - 218   SCI SCIE SCOPUS
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Enhancing the quantum yield and Cu2+ sensing sensitivity of carbon dots based on the nano-space confinement effect of silica matrix

Qiao, Yali (Corresponding author. ) ; Liu, Chunyan ; Zheng, Xingwang ;
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    Abstract Although the analytical applications of the fluorescent carbon dots (CDs) were widely explored, the development of effective fluorescence signal amplification scheme based on the CDs was challengeable. In this work, we firstly found that, after CDs and polyethyleneimine (PEI) were together doped into silica nanoparticles via a reverse microemulsion route, the CDs inside as-prepared CDs/PEI/silica nanoparticles (CDs/PEI/SiO 2 NPs) presented the higher fluorescence quantum yield and stronger signal amplification ability than that of free-state CDs. Here, the possible fluorescence enhancing mechanism of CDs inside CDs/PEI/SiO 2 NPs was investigated by UV–vis absorption spectra, fluorescence spectra, IR spectra, transmission electron microscope and zeta potential technique and the possible mechanism was also proposed. In addition, the Cu 2+ was selected as the model to investigate the signal amplification feature of the CDs/PEI/SiO 2 NPs. Our results showed that, encapsulation of CDs and PEI into silica NPs lead to a fluorescence enhancement of CDs, the fluorescence quantum yield of CDs increased from 13.7% to 38.6%. The as-prepared CDs/PEI/SiO 2 NPs exhibited 100-times sensitivity increasing for sensing Cu 2+ compared with free-state CDs sensing scheme reported by the previous literature. Highlights Silica matrix selectively reacted with three kinds of amine groups of PEI. Amine groups of PEI densely concentrated inside silica matrix. 3-times quantum yield enhancing by encapsulation of CDs and PEI into silica matrix. The CDs/PEI/SiO 2 NPs presented a 100 times sensitivity increasing for sensing Cu 2+ than free-stated CDs.


  • 주제어

    Silica nanomatrix .   Carbon dots .   Fluorescence enhancement .   Signal amplification .   Cu2+ sensing.  

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