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Hollow nanomaterials based on silver-gold and silver-palladium dor aplications in plasmonic catalysis

Grant number: 14/23562-7
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2015
Effective date (End): December 31, 2015
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Pedro Henrique Cury Camargo
Grantee:Isabella Genesini Freitas
Home Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

This project proposes the development of bimetallic nanostructures containing interior voids with size, shape and well-defined and controllable composition. In particular , we are interested in obtaining nanocascas and nanotubes composed of silver - gold ( Au - Ag ) or silver - palladium ( Ag- Pd) for applications in catalysis enhanced / mediated by plasmon excitation . The first stage of this work will focus on the synthesis and characterization of Ag nanostructures with defined morphology and dimensions . Specifically , this project will focus on: i ) nanospheres with diameters ~ 35 nm ; and ii ) with nanowire width d 100 nm and lengths > 3 mm . In the second part of this work , the Ag nanospheres and nanowires are used as sacrificial templates in the galvanic replacement reaction with ions or AuCl4- PdCl42- type Ag - Au and Ag - Pd . In the last stage of this work , the nanostructures generated will be used as catalysts for processes mediated by plasmonic excitation employing the oxidation of 4 - aminothiophenol the 4,4 - dimercaptoazobenzeno as a model system . In this sense , we intend to evaluate the effect of composition, structure and presence of one or more metals with frequency plasmon excitation in the visible region of the catalytic activity observed.