研究目的
To develop a synthetic route for carbon dot-based inks that achieve full-color ultralong afterglow and multiple emission modes for advanced optical anti-counterfeiting applications.
研究成果
The encapsulating-dissolving-recrystallization route successfully enabled the synthesis of CD-based inks with full-color ultralong afterglow and triple emission modes (FL, DF, RTP), which are selectively activatable by different excitation wavelengths. This approach enhances optical anti-counterfeiting by providing multiple, color-tunable, and long-lived emissions, with potential applications in sensing, photodynamic therapy, and bio-imaging.
研究不足
The afterglow properties are dependent on the specific synthesis conditions and the use of DMF as a solvent, which may limit environmental friendliness. The red RTP emission has a shorter lifetime compared to blue and green emissions. The mechanism for certain emission behaviors (e.g., in NCD2-C) is not fully understood.
1：Experimental Design and Method Selection:
An encapsulating-dissolving-recrystallization route was designed for synthesizing nitrogen-doped carbon dot (NCD)-based anti-counterfeiting inks. This involved hydrothermal synthesis of NCDs, embedding them into melting-recrystallized urea to form composites, dissolving in DMF to create inks, and inkjet printing on paper to reconstruct the afterglow properties.
2：Sample Selection and Data Sources:
NCDs were synthesized from folic acid and ethanol (NCD1), with variations NCD2 and NCD3 prepared similarly. Characterization included transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-vis absorption, photoluminescence spectra, and afterglow decay measurements.
3：List of Experimental Equipment and Materials:
Equipment included a hydrothermal reactor, centrifuge, heating apparatus for recrystallization, inkjet printer, UV lamps (254 nm, 365 nm, 450 nm), spectrometers for optical measurements. Materials included folic acid, ethanol, urea, biuret, DMF, paper.
4：Experimental Procedures and Operational Workflow:
Synthesize NCDs via hydrothermal reaction; centrifuge to isolate; embed in melting-recrystallized urea to form composites; dissolve composites in DMF to prepare inks; load inks into inkjet printer; print on paper; characterize optical properties under different excitations.
5：Data Analysis Methods:
Optical spectra were analyzed for emission peaks and lifetimes; decay curves were fitted with multi-exponential functions; XPS and FT-IR data were deconvoluted to identify functional groups.
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