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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Dendritic Gold Nanoparticles Towards Transparent and Electroactive Electrodes

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Total Authors: 3
Document type: Journal article
Source: Anais da Academia Brasileira de Ciências; v. 91, n. 4 2019-11-28.

Abstract: The combination of UV-visible absorption and electrochemical experiments (spectroelectrochemistry) enables to obtain highly specific spectroscopic information (in situ and operando) from modified surfaces. However, such application can be limited by the self-absorbance, for example, when metallic nanoparticles are present on modified surfaces. Indium-tin oxide onto glass (ITO) is a typical electrode commonly used for spectroelectrochemistry; ITO is an oxide-based semiconductor, and in numerous applications it is necessary to promote the modification of the electrode surface without significant loss of transparency. Here, we report a simple strategy to obtain ITO electrodes modified with self-assembled polyelectrolytes and active dendritic gold nanoparticles (AuNPs), a combination of soft and metallic materials that results in electrodes with significant optical transparency. Self-assembled poly(sodium styrene sulfonate) and polyamidoamine dendrimer (PSS/PAMAN bilayer) were applied successfully as efficient platform for monodisperse dendritic AuNPs electrodeposition, and the electrode containing those materials shows substantial optical transmittance from 400nm to 800nm. The combination of transparency and the presence of AuNPs homogeneously dispersed start to be a practical approach to develop metal-based electrodes for spectroelectrochemistry. (AU)

FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:Osvaldo Novais de Oliveira Junior
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/16672-3 - Development of High Performance Bioelectrodes for Application in Miniaturized Biofuel Cell
Grantee:Frank Nelson Crespilho
Support type: Regular Research Grants
FAPESP's process: 09/12000-0 - Electro-Synthesis of metal nanoparticles on modified electrodes with Organic Polyelectrolytes for Enzyme Catalyses
Grantee:Rodrigo Michelin Iost
Support type: Scholarships in Brazil - Master
FAPESP's process: 13/04663-4 - Enzymatic bioelectrodes applied in biofuel cells: experimental and simulation
Grantee:Frank Nelson Crespilho
Support type: Regular Research Grants