2011 年 36 巻 2 号 p. 213-216
Pd membranes show high H2 permselectivity. In this study, ceramic particles were co-deposited in a Pd thin film to reduce Pd amounts of the thin films. Additives for ceramic particles were investigated. Pd films were prepared by using an electroplating at 0.20 A cm-2. CTAB (Cetyl trimethyl ammonium bromide: +), PEG (polyethylene glycol: ±), TPAOH (tetrapropyl ammonium hydroxide: +), BTMAOH (benzyltrimethylammonium hydroxide: +) and SDS (Sodium Dodecyl Sulfate: -) were employed for additives. Effects of charge and viscosity of the additives were tested using LTA zeolites (about 1 μm) for ceramic particles. Pd thin films were characterized by using surface and bulk EDX. LTA ratio for CTAB is much higher than those of PEG and SDS. Positive charge is effective for co-deposition, because Pd ion is also positively charged. LTA ratio for CTAB is also higher than those of TPAOH and BTMAOH. The charge of the additives must be key factor of the co-deposition. Surface ratio increased for TPAOH and BTMAOH samples. However, no relationship was found between surface ratios and the viscosity of the electrolyte.