Journal
NANO RESEARCH
Volume 12, Issue 4, Pages 815-821Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-019-2293-z
Keywords
carbon cell imaging; dual-emissive; photoluminescence; pH-sensitive; Ag+ probe
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Funding
- Beijing Nova Program Interdisciplinary Studies Cooperative Project [Z181100006218138]
- Science Foundation of China University of Petroleum-Beijing [2462018BJC004]
- National Key Specialty Construction Project of Clinical Pharmacy [30305030698]
- Research Funding of Sichuan Provincial People's Hospital [2017LY08]
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The dual-emissive N, S co-doped carbon dots (N, S-CDs) with a long emission wavelength were synthesized via solvothermal method. The N, S-CDs possess relatively high photoluminescence (PL) quantum yield (QY) (35.7%) towards near-infrared fluorescent peak up to 648 nm. With the advanced characterization techniques including X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), etc. It is found that the doped N, S elements play an important role in the formation of high QY CDs. The N, S-CDs exist distinct pH-sensitive feature with reversible fluorescence in a good linear relationship with pH values in the range of 1.0-13.0. What is more, N, S-CDs can be used as an ultrasensitive Ag+ probe sensor with the resolution up to 0.4 M. This finding will expand the application of as prepared N, S-CDs in sensing and environmental fields.
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