“Nanoporous Gold from dealloying of a Au-based amorphous alloys: mechanisms of dealloying and applications” March, 18th 2016
Il 18 marzo 2016 alle ore 14:30 presso il LIME Laboratory dell’Università Roma Tre – Via Vito Volterra, 48 Roma – la Dr.ssa Paola Rizzi (Chemistry Department and NIS, University of Turin) terrà il seminario dal titolo:
Nanoporous Gold from dealloying of a Au-based amorphous alloys: mechanisms of dealloying and applications
Due to their amorphous structure, glassy metals show unique properties with respect to crystalline counterparts. Among a large variety of applications, amorphous alloys can be regarded as precursors for the production of nanoporous metals. Nanoporous metals can be produced, among others techniques, by dealloying, a process in which the less noble elements in an alloy are chemically or electrochemically dissolved into an electrolyte, leaving on the surface the noble element to form a complex structure composed by ligaments and pores with size of tens or hundreds of nanometers. The interest for nanoporous gold (NPG) is currently increasing due to the relatively simple synthesis techniques and its structural, morphological and chemical flexibility. NPG can be produced in a large variety of morphologies and it is characterised by structural and chemical flexibility that allow to adapt it for different applications ranging from catalysis, electrocatalysis, electronics, and optics. In this work, the production of NPG via dealloying of Au-based amorphous precursors is outlined, showing how the final morphology can be tailored by controlling processing parameters and alloy composition. Moreover, the electrocatalytic activity is described for samples with different structures in order to determine the influence of the ligament/pore size on the final properties of the nanoporous gold.
Prof. Giovanni Sotgiu, prof. Edoardo Bemporad – Dipartimento di Ingegneria
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