Journal
APPLIED SURFACE SCIENCE
Volume 414, Issue -, Pages 238-243Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.04.092
Keywords
Femtosecond laser ablation; Carbon nanodots; Biosensing; Surface states
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Funding
- National Natural Science Foundation of China [61235003, 11674260, 11474078]
- Fundamental Research Funds for the Central Universities
- collaborative Innovation Center of Suzhou Nano Science and Technology
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
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Nitrogen-doped carbon nanodots (CDs) are synthesized by one-step femtosecond laser ablation of graphite powder in aminotoluene at room temperature. The as-prepared CDs have the average diameter of 2.87 nm and possess an excitation-independent emission covering nearly the whole visible light region at a single excitation wavelength. The X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) analysis indicate that there are a huge number of multiple oxygen groups and amine groups on the surface of the CDs. As their different fluorescence peaks originated from different emission surface groups on the nanodots show different pH dependence, these CDs can be used for ratiometric pH sensing. (C) 2017 Elsevier B.V. All rights reserved.
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