Abstract
This paper reports the preparation of green-emissioned CDs by a one-step hydrothermal route with DL-malic acid and ethylenediamine as raw materials and further explored the impacts of the amount of reactants, the reaction time, and temperature upon the optical properties of prepared CDs, to select the optimal preparation parameters. The optical properties, surface groups, and element components of the prepared CDs have been systematically studied by UV-Vis absorption spectra, fluorescence spectra, FTIR, EDS, and XPS. The prepared CDs have been applied to realize the fingerprint development, fluorescence ink, and, specifically, the detection of Fe2+ through an inner filter effect with its detection range at 2.0×10−7−2.3×10−5 mol/L.
Highlights
In recent years, carbon dots (CDs), as a novel fluorescent carbon nanomaterial, have been widely applied in the fields of biological sensor [1, 2], biological imaging [3, 4], drug delivery [5, 6], photocatalysis [7], and light-emitting diodes [8], thanks to their unique properties, such as excellent biological compatibility, stable photoluminescence, and easy surface functionalization [1]
This paper reports the preparation of green-emissioned CDs through a hydrothermal route with DL-malic acid and EDA as raw materials and explores the impacts of the ratio of reactants, reaction time, and temperature upon the fluorescence intensity of CDs to get the optimal reaction parameters
The optical properties, surface groups, and element components of the prepared CDs have been systematically studied by UV-Vis absorption spectra, fluorescence spectra, FTIR, EDS, and XPS
Summary
Carbon dots (CDs), as a novel fluorescent carbon nanomaterial, have been widely applied in the fields of biological sensor [1, 2], biological imaging [3, 4], drug delivery [5, 6], photocatalysis [7], and light-emitting diodes [8], thanks to their unique properties, such as excellent biological compatibility, stable photoluminescence, and easy surface functionalization [1]. The adjustment of the emission wavelength of prepared CDs is mostly through the selection of raw materials, without noticing the impacts of other synthesis parameters upon the optical properties of prepared CDs. Some research teams have reported the adjustment of reaction solvents; reaction temperature and time could effectively change the emission wavelength of prepared CDs. Ding et al have acquired PL emission from blue to NIR CDs with o-phenylenediamine and L-glutamic acid as raw materials, and formamide, dimethylformamide (DMF), ethanol, and H2SO4 aqueous solution as solvents [26]. The proper developer would interact with the metal ions to form a colored complex with strong absorption ability, leading to a dramatic change in CD fluorescence This method exhibits excellent selectivity and sensitivity. The CDs exhibit excellent stability and have been successfully applied in fingerprint development, fluorescence ink, and detection of Fe2+ through the inner filter effect
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
