Document Detail

Gold-Coated Silver Dendrites as SERS Substrates with Improved Lifetime.
MedLine Citation:
PMID:  23106336     Owner:  NLM     Status:  Publisher    
Nanostructured silver is known to yield the highest signal enhancement factors in surface-enhanced Raman spectroscopy, but its low chemical stability towards oxidation presents a challenge in the realization of Ag-based SERS substrates with long operating lifetime. Here, a study of the long-term stability of silver dendrites as SERS substrates is reported. SERS spectra of 1,2-benzenedithiol monolayers on Ag dendrites, acquired over a period of time in excess of one year, shows appreciable degradation with time. On the other hand, no degradation is observed in the spectra of monolayers deposited on Ag dendrites that were coated with a monolayer-thin Au film deposited by an immersion plating process. X-ray photoelectron spectra confirm oxidation of the uncoated Ag dendrites while no chemical changes are detected in the Au-coated ones. These results suggest that galvanic displacement of Au on preformed Ag nanostructures provides a suitable route to produce SERS active substrates with long operating and/or shelf lifetimes.
Albert Gutes; Roya Maboudian; Carlo Carraro
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-29
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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