Journal article
"On-Off-On" fluorescence sensor based on g-C3N4 nanosheets for selective and sequential detection of Ag+ and S-2
Talanta (Oxford), Vol.168, pp.168-173
06/01/2017
PMID: 28391838
Abstract
Detection of silver (Ag+) and sulfide (S2-) ions is important because their presence in large amounts can cause many diseases. In this study, a novel, simple, "on-off-on" fluorescence sensor based on g-C3N4 nanosheets for sequential detection of Ag+ and S2- was designed. The fluorescence signal of the g-C3N4 nanosheets is quenched because Ag+ chelates with the N of the g-C3N4 nanosheets, leading to photoinduced electron transfer from the sheets to Ag+. After adding S2-, the fluorescence of the g-C3N4 nanosheets is recovered due to formation of Ag2S, which activates the fluorescence of the g-C3N4 nanosheets. The recovery efficiency was found to increase with increasing concentrations of S2-, with linear calibration ranging from 0 nmoVL to 30 nmol/L. Other potentially interfering species, such as SO42-, PO43-, HPO42-, H2PO4-, CO32-, NO3-, Ac-, and HCO3-, presented negligible effects on S2- detection. Moreover, the proposed sensor exhibited several advantages, including low cost, easy preparation, rapid detection, excellent biocompatibility, and a switchable fluorescence response. These attributes make this fluorescent sensor a promising tool for environmental applications.
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Details
- Title
- "On-Off-On" fluorescence sensor based on g-C3N4 nanosheets for selective and sequential detection of Ag+ and S-2
- Creators
- Shan Wang - Xianyang Normal UniversityQian Lu - Washington State UniversityXu Yan - Washington State UniversityMingming Yang - Washington State UniversityRanfeng Ye - Washington State UniversityDan Du - Washington State UniversityYuehe Lin - Washington State University
- Publication Details
- Talanta (Oxford), Vol.168, pp.168-173
- Academic Unit
- School of Mechanical and Materials Engineering
- Publisher
- Elsevier
- Number of pages
- 6
- Grant note
- China Scholarship Council
- Identifiers
- 99901227840301842
- Language
- English
- Resource Type
- Journal article