Copper plating on devitrified porcelain enamel.

Tsuyama, Koichi; Okamura, Toshiro; Nakayama, H.

doi:10.4139/sfj.41.442

Cited by 2 publications

(1 citation statement)

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“…In other words, Pd(II) is reduced to zero valent palladium by the alkaline HCHO Pd(II) + 2e ---> Pd(0) [2] On the other hand, in an anodic oxidation of HCHO, two reactions with and without an evolution of hydrogen gas are known to occur depending on the kind of metal electrode. 7:7'~8 Since the evolution of hydrogen gas could not be detected in this reaction, the oxidation of HCHO may proceed as follows HCHO + 3 OH --4 HCOO-+ 2H20 + 2e [3] From these results, it is concluded that a zero valent highly active palladium is foizned initially on the ZnO thin film by alkaline HCHO which also acted as a reducing agent in the electroless copper plating bath. This reduced palladium could serve effectively as a catalytic center, 19 and the electroless copper deposition proceeds rapidly (Fig.…”

Section: Resultsmentioning

confidence: 93%

Reaction Mechanism of Electroless Metal Deposition Using ZnO Thin Film (I): Process of Catalyst Formation

Yoshiki¹,

Hashimoto²,

Fujishima³

1995

J. Electrochem. Soc.

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The reaction mechanism of electroless metal deposition proceeding selectively on a ZnO thin film coated on a glass substrate was investigated by x-ray diffraction, x-ray photoelectron spectroscopy, and inductively coupled plasma measurements. The ZnO thin film was activated for e]ectroless metal deposition just by immersion in i.I mM PdC]2 solution adjusted to pH 2.5. In this process, Pd(II) was selectively adsorbed on the ZnO thin film while simultaneously the ZnO underwent dissolution. The dissolution of ZnO thin film easily occurred on the (002) face with polarity. The strongly adsorbed Pd(II) was reduced to Pd(0) by a reducing agent in the electroless plating bath and this served as a catalyst center. As a result, metal layers were obtained selectively on the ZnO thin film in the electroless plating bath.

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Section: Resultsmentioning

confidence: 93%