Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 221, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.117211
Keywords
Doped graphene quantum dots; Sulfur; Phosphorus; Fluorescent probes; Nitrite
Categories
Funding
- National Natural Science Foundation of China [21675062]
- Science and Technology Planning Project of Fujian Province, China [2017J05024, 2018D0019]
- Fujian Special Plan Young Top-notch Talent with Scientific and Technological Innovation
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Doping graphene quantum dots (GQDs) with heteroatoms can change their band gap and electronic density, thus enhancing their fluorescence quantum yield (QY). In this work, we for the first time reported a nontoxic, rapid, and one-pot hydrothermal method to synthesize sulfur and phosphorus co-doped GQDs (S, P-GQDs). Citric acid was functioned as a carbon source, whereas sodium phytate and anhydrous sodium sulfate are used as the P and S sources, respectively, in this bottom-up synthesis. The resulting S, P-GQDs exhibit high heteroatomic doping ratios of 9.66 at.% for S and 3.34 at.% for P, and higher QY than those obtained from monoatomic doped GQDs. Additionally, the as-prepared S, P-GQDs exhibit excitation-dependent behavior, pH sensitivity between 8.0 and 13.0, high tolerance of ionic strength. More importantly, the as-synthesized S, P-GQDs show a sensitive and selective behavior for sensing nitrite (NO2-) in the concentration range of 0.7-91 mu mol/L, and the detection limit was as low as 0.3 mu mol/L. Additionally, the 5, P-GQDs was successfully used in detecting NO2- in pickled foods, showing their promise for potential applications in realistic analysis. (C) 2019 Elsevier B.V. All rights reserved.
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