Document Detail

AuAg bimetallic nanoparticles: formation, silica-coating and selective etching.
MedLine Citation:
PMID:  14750668     Owner:  NLM     Status:  PubMed-not-MEDLINE    
A time-resolved study of the formation of AuAg alloy nanoparticles during boiling of AgNO3 and HAuCl4 in the presence of sodium citrate has been performed by monitoring the UV-visible spectra of the solutions. This study reveals clear differences with respect to the formation of pure Au particles, and suggests that gold and silver nanoparticles nucleate separately, but lattice rearrangement eventually leads to formation of alloy nanoparticles with the expected composition, which was confirmed by high resolution TEM. Additionally, we studied the chemical reaction of the alloy nanoparticles with NH4OH, observing that part of the Ag atoms get oxidized, but reorganization of the crystal lattice during the reaction prevents full transformation into pure gold nanoparticles. This allows the synthesis of silica-coated bimetallic particles with tailored plasmon resonance between ca. 430 and 520 nm, as well as homogeneous incorporation of the coated alloy nanoparticles within silica gels.
Benito Rodríguez-González; Ana Sánchez-Iglesias; Michael Giersig; Luis M Liz-Marzán
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Faraday discussions     Volume:  125     ISSN:  1359-6640     ISO Abbreviation:  Faraday Discuss.     Publication Date:  2004  
Date Detail:
Created Date:  2004-01-30     Completed Date:  2004-02-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9212301     Medline TA:  Faraday Discuss     Country:  England    
Other Details:
Languages:  eng     Pagination:  133-44; discussion 195-219     Citation Subset:  -    
Departamento de Química Física, Universidade de Vigo, 36200 Vigo, Spain.
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