アミノシラン処理ガラス上への無電解ニッケルめっき

次亜リン酸ソーダによる前処理の影響

抄録

Aminosilylated glass beads can be readily bound with palladium ion (Pd²⁺) in PdCl₂ aq. solution. Electroless nickel deposition reactions were studied after pretreating such Pd²⁺ bound beads in hypophosphite (NaH₂PO₂) aq. solution at high temperature (Process 2). The reaction rate was found to be not dependent on the amount of loaded palladium but on the surface area of the substrate (i.e., was constant per unit area). It was also found that no anomalous increase in rate and no time lag in the initiation step were observed compared with Process 1 (the process without pretreating in NaH₂PO₂ aq. solution). The reasons for these results are discussed assuming that metallic palladium articles (catalytic nuclei) were formed on the substrate surface by pretreating the Pd²⁺-bound beads in the NaH₂PO₂ aq. solution. Finally, the differences of the reaction between Process 1 and Process 2 were summarized.