Effect of carbon inclusion on microstructure of electrodeposited Au-Ni alloy films

Takahiro Inoue, Kazuo Sato, Tokihiko Yokoshima, Atsushi Sugiyama, Yutaka Okinaka, Tetsuya Osaka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The microstructure of electrodeposited nano-crystalline Au-Ni film was investigated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM). Carbon was found to be included in the deposit, and the state of bonding and dispersion of the carbon and its effect on the microstructure of Au-Ni film were studied. Nano-crystalline films were found to be composed of Au-rich crystalline phase and Ni-rich phase, and the latter consisted of crystalline and amorphous phases. The amorphous phase contained a large number of carbon particles measuring 5-20 nm. TEM and STEM examinations showed that the large carbon particles possess a graphite-like structure with some of the particles being arranged in arrays. Mechanism of the carbon inclusion was discussed based on the results of XRD and the composition analysis of Au-free Ni film electrodeposited from a cyanide-containing bath. These results showed that carbon is co-deposited with Ni as nickel carbide and also as carbon particles. It is concluded that the inclusion of carbon and the coexistence of Au and Ni are the conditions necessary for the formation of amorphous structure of the electrodeposited Au-Ni alloy film.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume158
Issue number6
DOIs
Publication statusPublished - 2011

Fingerprint

Carbon
inclusions
microstructure
Microstructure
carbon
Crystalline materials
Transmission electron microscopy
transmission electron microscopy
X ray diffraction
Scanning electron microscopy
scanning electron microscopy
Graphite
Cyanides
cyanides
diffraction
carbides
Carbides
baths
x rays
Deposits

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Effect of carbon inclusion on microstructure of electrodeposited Au-Ni alloy films. / Inoue, Takahiro; Sato, Kazuo; Yokoshima, Tokihiko; Sugiyama, Atsushi; Okinaka, Yutaka; Osaka, Tetsuya.

In: Journal of the Electrochemical Society, Vol. 158, No. 6, 2011.

Research output: Contribution to journalArticle

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