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A 40-μm-thick, self-supporting, transparent film was obtained upon slowly evaporating an aqueous mixture of synthetic hectorite, Pt(NH 3 ) 2 Cl 2 , and polyethylene oxide (PEO). The resulting film containing 2.4 wt.% platinum was then reduced under H 2 at 150 °C for 2–4 h, turning black upon reduction. XRD shows development of Pt(0) by the appearance of crystalline...
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