Surfactant-Templated Synthesis and Catalytc Properties of Patterned Nanoporous Titania Supports Loaded with Platinum Nanoparticles

摘要

Hexagonally patterned porous titania is synthesized from a titanium isopropoxide precursor using a viscous surfactant template separating nanoscopic bicontinuous channels of water andisooctane.Subsequent salt reduction in the aqueous nanochannels decorates the pore surfaces with well-separated platinum(Pt) nanoparticles.Because of the decreased mass transfer resistance provided by the patterned and interconnected macropores that persist throughout the support,these nanocomposites.exhibit a significantly higher carbon monoxide oxidation efficiency than that obtained with a commercial support that has a fourfold larger specific surface area.This simple templated synthesis strategy for creating highly organized composites has wide applications beyond the one reported here,including photocatalysis,photonic crystals,sensors,and solar cell assemblies.