Dye-sensitized core-shell NaGdF4:Yb,Er@NaGdF4:Yb,Nd upconversion nanoprobe for determination of H2S

Hongqi Chen; Wen Wang; Changchun Ji; Lun Wang

doi:10.1016/j.saa.2020.119281

Dye-sensitized core-shell NaGdF₄:Yb,Er@NaGdF₄:Yb,Nd upconversion nanoprobe for determination of H₂S

Spectrochim Acta A Mol Biomol Spectrosc. 2021 Mar 5:248:119281. doi: 10.1016/j.saa.2020.119281. Epub 2020 Dec 3.

Authors

Hongqi Chen¹, Wen Wang², Changchun Ji², Lun Wang³

Affiliations

¹ Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China. Electronic address: hq80chen@mail.ahnu.edu.cn.
² Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
³ Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China. Electronic address: wanglun@mail.ahnu.edu.cn.

PMID: 33310610
DOI: 10.1016/j.saa.2020.119281

Abstract

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 μM, 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.

Keywords: Determination; Dye-sensitized; H(2)S; Upconversion luminescence probe.