Document Detail


"Turn-on" Fluorescence Detection of Lead Ions Based on Accelerated Leaching of Gold Nanoparticles on the Surface of Graphene.
MedLine Citation:
PMID:  22264012     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A novel platform for effective "turn-on" fluorescence sensing of lead ions (Pb2+) in aqueous solution was developed based on gold nanoparticles (AuNPs)-functionalized graphene. The AuNPs-functionalized graphene exhibited minimal background fluorescence due to extraordinarily high quenching ability of AuNPs. Interestingly, the AuNPs-functionalized graphene underwent fluorescence restoration as well as significant enhancement upon adding Pb2+, which was attributed to the fact that Pb2+ could accelerate the leaching rate of the AuNPs on graphene surfaces in the presence of both thiosulfate (S2O32-) and 2-mercaptoethanol (2-ME). Consequently, this could be utilized as the basis for selective detection of Pb2+. With the optimum conditions chosen, the relative fluorescence intensity showed good linearity versus logarithm concentration of Pb2+ in the range of 50-1000 nM (R = 0.9982), and a detection limit of 10 nM. High selectivity over common co-existent metal ions was also demonstrated. The practical application had been carried out for determination of Pb2+ in tap water and mineral water samples. The Pb2+-specific "turn-on" fluorescence sensor, based on Pb2+ accelerated leaching of AuNPs on the surface of graphene, provided new opportunities for high sensitive and selective Pb2+ detection in aqueous media.
Authors:
Xiuli Fu; Tingting Lou; Zhaopeng Chen; Meng Lin; Weiwei Feng; Lingxin Chen
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-20
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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