期刊
JOURNAL OF APPLIED PHYSICS
卷 117, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4909506
关键词
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资金
- National Natural Science Foundation of China [61235003, 11304242]
- collaborative Innovation Center of Suzhou Nano Science and Technology
Photoluminescent carbon nanodots (C-dots) with size tunability and uniformity were fabricated in polyethylene glycol (PEG(200N)) solution using femtosecond laser ablation method. The size distributions and photoluminescence (PL) properties of C-dots are well controlled by adjusting the combined parameters of laser fluence, spot size, and irradiation time. The size reduction efficiency of the C-dots progressively increases with decreasing laser fluence and spot size. The optimal PL spectra are red-shifted and the quantum yields decrease with the increase in C-dots size, which could be attributed to the more complex surface functional groups attached on C-dots induced at higher laser fluence and larger spot size. Moreover, an increase in irradiation time leads to a decrease in size of C-dots, but long-time irradiation will result in the generation of complex functional groups on C-dots, subsequently the PL spectra are red-shifted. (C) 2015 AIP Publishing LLC.
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