Document Detail


Polyethyleneimine-Templated Ag Nanoclusters: A New Fluorescent and Colorimetric Platform for Sensitive and Selective Sensing Halide Ions and High Disturbance-Tolerant Recognitions of Iodide and Bromide in Coexistence with Chloride under Condition of High Ionic Strength.
MedLine Citation:
PMID:  23134573     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Ag nanoclusters functioned by hyperbranched polyethyleneimine have been developed as a new fluorescent and colorimetric platform for sensitive and selective recognition of halide ions (e.g., Cl-, Br-, and I-). The recognition mechanism is based on the unique reactions between halide ions and the silver atoms. In particular, halide-induced oxidative etching and aggregation can produce a strong fluorescence quenching of Ag nanoclusters. This sensing system exhibits a remarkably high selectivity toward halide ions over most of anions and cations, and shows good linear ranges and lower detection limits: the linear ranges are 0.5 to 80 μM for Cl-, 0.1 to 14 μM for Br-, and 0.05 to 6 μM for I-, respectively; the limits of detection for Cl-, Br-, and I-, at a signal-to-noise ratio of 3, are estimated to be 200, 65, and 40 nM, respectively. Specifically, Br- and I- could be recognized selectively in the coexistence with Cl- under the condition of higher ionic strength, which is a significant advantage in the detection of Br- and I- in real samples. In addition, the recognition of halide could be performed by colorimetric method, which is also attractive and promising because of its simplicity, rapidity, reliability, and low cost. Furthermore, this sensing system has been applied successfully to the detection of Cl- in real water samples.
Authors:
Fei Qu; Nian Bing Li; Hong Qun Luo
Related Documents :
19408253 - Structural characterization and identification of c(19)- and c(20)-diterpenoid alkaloid...
17295423 - Mass spectral studies of native and mass-labeled perfluorooctanesulfonamides.
20152423 - Determination of dimethylselenide and dimethyldiselenide in milk and milk by-products b...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-8
Journal Detail:
Title:  Analytical chemistry     Volume:  -     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Evidence for Vpr-dependent HIV-1 replication in human CD4+ CEM.NKR T-cells.
Next Document:  Social Network Analysis for Assessment of Avian Influenza Spread and Trading Patterns of Backyard Ch...