Web of Science: 7 cites, Scopus: 7 cites, Google Scholar: cites
Tunable electrochemistry of gold-silver alloy nanoshells
Russo, Lorenzo (Institut Català de Nanociència i Nanotecnologia)
Puntes, Víctor (Institut Català de Nanociència i Nanotecnologia)
Merkoçi, Arben (Institut Català de Nanociència i Nanotecnologia)

Data: 2018
Resum: The widespread and increasing interest in enhancing biosensing technologies by increasing their sensitivities and lowering their costs has led to the exploration and application of complex nanomaterials as signal transducers and enhancers. In this work, the electrochemical properties of monodispersed AuAg alloy nanoshells (NSs) with finely tunable morphology, composition, and size are studied to assess their potential as electroactive labels. The controlled corrosion of their silver content, caused by the oxidizing character of dissolved oxygen and chlorides of the electrolyte, allows the generation of a reproducible electrochemical signal that is easily measurable through voltammetric techniques. Remarkably, the underpotential deposition of dissolved Ag catalyzed on AuAg NS surfaces is observed and its dependence on the nanoparticle morphology, size, and elemental composition is studied, revealing a strong correlation between the relative amounts of the two metals. The highest catalytic activity is found at Au/Ag ratios higher than ≈ 10, showing how the synergy between both metals is necessary to trigger the enhancement of Ag reduction. The ability of AuAg NSs to generate an electrocatalytic current without the need for any strong acid makes them an extremely promising material for biosensing applications.
Nota: Número d'acord de subvenció MINECO/MAT2015-70725-R
Nota: Número d'acord de subvenció AGAUR/2017/SGR-143
Nota: Número d'acord de subvenció EC/H2020/685817
Nota: Número d'acord de subvenció MINECO/SEV-2013-0295
Drets: Tots els drets reservats.
Llengua: Anglès
Document: article ; recerca ; acceptedVersion
Matèria: Au nanoshells ; Nanoparticles ; Surface chemistry ; Underpotential deposition
Publicat a: Nano research, Vol. 11, Issue 12 (December 2018) , p. 6336-6345, ISSN 1998-0000

DOI: 10.1007/s12274-018-2157-y


Postprint
14 p, 1.1 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut Català de Nanociència i Nanotecnologia (ICN2)
Articles > Articles de recerca
Articles > Articles publicats

 Registre creat el 2019-12-20, darrera modificació el 2020-08-02



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