アミノシラン処理ガラス上への無電解ニッケルめっき : パラジウムの吸着状態と触媒活性との相関

概要

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Studies were conducted on a new process of electroless plating characterized by pretreating successively with aminosilane and PdCl2. It is noteworthy that in an adsorption study of palladium from PdCl2 aqueous solution in the pretreating process a multilayer of palladium ion was formed on the surface of the aminosilylated glass beads. Different structural models were proposed for the adsorption states before and after the estimated amount of saturated monolayer adsorption, leading to the proposing of a coordinated combination mode (I) for the former and as polymeric chains (II) for the latter. The correlation between the amount of palladium adsorbed and catalytic activity in electroless plating was examined, and it was found that the state of palladium adsorption greatly influence the reaction velocity and procedure. Specifically, the reaction proceeds at a constant rate for substrates coverd with less than a saturated monolayer, while the reaction accelerates accompanied with the decomposition of the bath for multilayer adsorption samples. These phenomena were explained in reference to the structural models proposed.
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