Naslov
The Deconvolution of Nucleation and Growth Rates of Copper

Autori
Grubač, Zoran ; Metikoš-Huković, Mirjana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstract / - , 2005

Skup
CRYSTALLIZATION AND ELECTROCRYSTALLIZATION: FUNDAMENTALS AND APPLICATIONS, CEFA 2005

Mjesto i datum
Varna, Bugarska, 21.05.2005. - 28.05.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Copper; Nucleation; Carbon fibre microelectrodes; Chronoamperometry.

Sažetak
Electrodeposition of copper on carbon fibre microelectrode assemblies from acid solution of copper chloride was investigated using cyclic voltammetry, potentiostatic pulse technique and electrochemical impedance spectroscopy. The cyclic voltammetry measurements were performed in the potential range of copper nucleation, formation and dissolution. Using the criteria of cyclic voltammetry and impedance spectroscopy it has been established that the reduction of Cu(II) to metallic copper involves two discrete electron transfer steps. Potentiostatic current - time transients were obtained in an overpotential range of copper nucleation at two microelectrode assemblies: one of them consisted of 3000 (single) and the other of 36000 (multi) carbon fibre microdiscs. Microdiscs were so widely spaced that individual crystals could not interact in any way. In summary, by combining random assemblies of microelectrodes and the Bootstrap algorithm, it was possible to avoid diffusional interaction and thus to obtain plots of the number of crystals versus time as a direct output from electrochemical nucleation experiments. This means that hypotheses regarding the fundamentals of heterogeneous nucleation can now be tested directly, without any of assumptions about the nucleation law.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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