Sonochemical Preparation and Properties of Pt–3Y-TZP Nano-Composites |
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Authors: | Oleg Vasylkiv Yoshio Sakka Yasuaki Maeda Valeriy V Skorokhod |
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Affiliation: | National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan; College of Engineering, Osaka Prefectural University, Sakai, Osaka 599-8531, Japan; Institute for Materials Science, NASU 3, Kiev 03680, Ukraine |
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Abstract: | A uniformly aggregated 3 mol% yttria-stabilized tetragonal zirconia nano-powder (3Y-TZP) was prepared using thermal hydrolysis and the ultrasonic deagglomeration technique. The possibility of nano-engineering of Pt–3Y-TZP composite aggregates was studied. The as-synthesized Pt nano-particles (~2 nm) were impregnated into zirconia nano-aggregates (20–45 nm). The morphology manipulation technique allowed production of the composite zirconia-based aggregates in which a significant fraction of the Pt particles was embedded into the densified zirconia aggregates. Using the colloidal technique and low-temperature (1150°C) sintering, we prepared the Pt-zirconia (0.5–1.5 wt% of platinum) nano-composites with average 3Y-TZP grain sizes of 120 nm, and with the platinum grains size in the range of 20–60 nm. The catalytic properties of composite Pt–3Y-TZP nano-composites were studied and described. |
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