Document Detail


Fenton-like Reaction-Mediated Etching of Gold Nanorods for Visual Detection of Co2+
MedLine Citation:
PMID:  25486441     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We have proposed a Fenton-like reaction-mediated etching of gold nanorods and applied it to the sensitive visual detection of Co2+ ions. With the presence of bicarbonate (HCO3-) and hydrogen peroxide(H2O2), Co2+ ions trigger a Fenton-like reaction, resulting in the generation of superoxide radical (O2▪-). As a result, the gold nanorods are gradually etched by O2▪- in the presence of SCN-, accompanied by an obvious color change from green to red. The gold nanorods etching process preferentially occurs along the longitudinal direction, which is observed by transmission electron microscope. The etching mechanism is carefully proved by investigating the effects of different radical scavengers (eg. DMSO).The auto-oxidation of hydroxylamine assay further confirms the mechanism. Then, the main factors, including reactants concentrations, temperature and incubation time, are specifically investigated. Under optimized conditions, we get an excellent sensing performance for Co2+ with a lower detection limit of 1.0 nM via a spectrophotometer and a visual detection limit of 40 nM. In addition, this principle may provide a new concept of "intermediate-mediated etching of nanoparticles" for sensing.
Authors:
Zhiyang Zhang; Zhaopeng Chen; Dawei Pan; Lingxin Chen
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-12-8
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2014 Dec 
Date Detail:
Created Date:  2014-12-8     Completed Date:  -     Revised Date:  2014-12-9    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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