期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 248, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.119281
关键词
Dye-sensitized; Upconversion luminescence probe; H2S; Determination
类别
资金
- NSFC [21675002]
- Education Commission Natural Science Foundation of Anhui Province [KJ2017ZD25]
The water-solubility of core-shell upconversion nanoparticles was improved by a ligand exchange reaction; a sensing system for detection of H2S was successfully constructed with a wide linear detection range and low detection limit; the dye-sensitized nanoprobe showed satisfactory performance in real sample analysis.
The core-shell NaGdF4:Yb,Er@NaGdF4:Yb,Nd upconversion nanoparticles (UCNPs) were successfully obtained with the method of co-precipitation, and the water-solubility of UCNPs was improved by the ligand exchange reaction between nitrosyl tetrafluoroborate (NOBF4) and nanoparticles. The IR-783 dye with negative charge and NOBF4-UCNPs with positive charge can bind together by electrostatic action to sensitize UCNPs through the energy transfer from IR-783 to UCNPs. However, with the presence of Na2S (a commonly used H2S donor), a highly selective reaction between H2S and IR-783, which destoried the structure of IR-783 and blocked the energy transfer, thus led to the quenching of luminescent intensity. Based on this, a sensing system for determination of H2S has been constructed successfully. The linear range of H2S detection by this system is 0.5-15 mu M, and the detection limit is 34.17 nM. Furthermore, the dye-sensitized core-shell NaGdF4:Yb,Er@NaGdF4:Yb,Nd upconversion nanoprobe was applied to real sample analysis with satisfactory results. (C) 2020 Elsevier B.V. All rights reserved.
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