研究目的
Investigating the effect of ambient pressure on the size and photoluminescence properties of carbon nanodots fabricated by femtosecond laser ablation.
研究成果
The size of the CDs can be effectively reduced to less than 1 nm by increasing the ambient pressure during fabrication. The PL intensity of the CDs first increases and then decreases with further increase in pressure, attributed to the change in the quantity of surface functional groups due to the surface area change of the carbonic core.
研究不足
The study is limited to the effect of ambient pressure on the size and PL properties of CDs fabricated by femtosecond laser ablation. The potential effects of other parameters such as laser power, spot size, and irradiation time were not explored in this study.
1：Experimental Design and Method Selection:
A femtosecond pulse laser was used to fabricate carbon nanodots (CDs) in an autoclave with adjustable ambient pressure.
2：Sample Selection and Data Sources:
Carbon particles with an average size of 40–400 nm were dispersed into N-methyl pyrrolidone (NMP) for laser irradiation.
3：List of Experimental Equipment and Materials:
Ti: sapphire femtosecond pulse laser, autoclave reactor, transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption spectrophotometer, Fourier transform infrared (FTIR) spectrometer, time-correlated single-photon counting (TCSPC) system.
4：Experimental Procedures and Operational Workflow:
The solution was ablated using laser pulses of 400 μJ power for
5：5 h at different ambient pressures. The mixture was centrifuged to remove large particles, and the supernatant containing CDs was obtained. Data Analysis Methods:
TEM and HRTEM for particle size and lattice structure, XPS for surface functional groups, UV-Vis and PL spectra for optical properties, FTIR for chemical bonds, TRPL for PL dynamics.
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