“Nanostructured surfaces”

Influence of ultrasound on the deposition of metal nanostructures on porous copper and silicon by galvanic replacement
Zozulia G.I. 1, Kuntyi O.I.1, Shepida M.V.1, Mnykh R.V.1, Korniy S.V.2
1 Department of Chemistry and Technology of Inorganic Substances, Lviv Polytechnic National University. Bandera Str., 12, Lviv-79013, Ukraine.
E-mail: gzozula@ukr.net
2 Physico-Mechanical Institute of NASU. Naukova, 5, Lviv-79060, Ukraine

Modern research in the field of sensory and electrocatalysis is aimed at the formation of a highly developed catalytically active surface. Porous nanomaterials are characterized by a large electrocatalytic surface area and high density of active centers [1]. Therefore, the modification of porous metal and semiconductor surfaces by metal nanostructures by galvanic replacement is a promising method of obtaining nanostructured materials with given functional properties [2]. The aim of the work is to establish influence of ultrasound on the formation of metal nanostructures M/Cu and M/Si (M = Ag, Au, Pd) on micro- and nanoporous of copper and silicon surfaces.
Porous copper obtained by anodic dealloying of Cu–Zn alloy and porous silicon nanostructures formed by metalactified chemical etching (MACE) were used for the research. The influence of ultrasound frequency and power, as well as parameters of pulsed ultrasound on the geometry of deposited metal nanoparticles (MNPs) and their distribution on the porous surface is shown. It is established that the main factors influencing the structure of the deposited metal are following: the architecture of the porous surface; the nature of the renewable metal ion and its concentration; ultrasound mode and duration of sonogalvanic replacement. The proposed conditions under which the controlled formation of MNPs, nanodendrites or nanofilms on micro- and nanoporous of copper and silicon surfaces are realized.

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2.	Kuntyi O.I., Zozulya G.I., Shepida M.V., Nichkalo S.I. Deposition of nanostructured metals on the surface of silicon by galvanic replacement: A mini-review // Voprosy Khim Khim Tekhnol.-2019. -3.-P. 74-82.