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Nanocrystalline (NC) materials, exhibiting small particle size and large surface area, may be applied to gas sensors for which an excellent surface effect is required. In this study, NC Ti is synthesized by the gas-condensation method in 10 mbar helium atmosphere and 500 mbar oxygen is backfilled into the chamber to oxidize the NC Ti. NC TiO 2 are then doped with NC Pt to improve the sensitivity...