Preparation and characterization of d.c.-plated nanocrystalline nickel electrodeposits

I. Bakonyi, E. Tóth-Kádár, L. Pogány, A. Cziráki, Imre Gerocs, K. Josepovits, Birgit Arnold, Klaus Wetzig

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

The microstructure and electrical transport properties were investigated for d.c.-plated Ni electrodeposits prepared from different types of electrolysing bath with deposition current densities (idep) ranging from 2.5 to 50 A dm-2 onto either Cu or Ti substrates, which were subsequently removed from the deposits. The contamination of the Ni foils was investigated by several analytical techniques, and the impurity content (mainly Co and Fe) was found to be of the order of a few tenths of an atomic per cent. With decreasing deposition current density, the deposit grain size was found to decrease markedly, e.g. deposits with an average grain size of about 30 nm could be produced with idep = 5 A dm-2 from a bath containing one nickel salt (NiSO4) only. The surface morphology on the bath side of the electrodeposited Ni foils was characteristic for the type of bath, and its roughness correlated well with the observed grain sizes. The room-temperature resistivity increased and the temperature coefficient of resistivity decreased markedly with decreasing grain size as expected, whereas the shift of the room-temperature thermoelectric power towards less negative values is not yet completely understood. In discussing the factors controlling the deposit grain size, it is concluded that the Ni2+ ion content at the cathode-electrolyte interface and the amount of adsorbed hydrogen at the cathode surface may have a decisive role.

Original languageEnglish
Pages (from-to)124-136
Number of pages13
JournalSurface and Coatings Technology
Volume78
Issue number1-3
Publication statusPublished - Jan 1996

Fingerprint

Nickel
Deposits
grain size
nickel
baths
preparation
deposits
Metal foil
Cathodes
Current density
foils
cathodes
Thermoelectric power
current density
electrical resistivity
Transport properties
Temperature
Electrolytes
Surface morphology
Hydrogen

Keywords

  • Electrical transport properties
  • Electrodeposition
  • Nanocrystalline nickel

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Preparation and characterization of d.c.-plated nanocrystalline nickel electrodeposits. / Bakonyi, I.; Tóth-Kádár, E.; Pogány, L.; Cziráki, A.; Gerocs, Imre; Josepovits, K.; Arnold, Birgit; Wetzig, Klaus.

In: Surface and Coatings Technology, Vol. 78, No. 1-3, 01.1996, p. 124-136.

Research output: Contribution to journalArticle

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