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Monodispersed TiO 2 spherical colloids with diameters of about 250nm were prepared by a sol–gel method. Heterostructural Ag–TiO 2 spheres were manipulated by surface engineering, in which the Ag nanoparticles with an average size of 10nm were uniformly distributed on the surface of the TiO 2 nanospheres by in situ reduction and growth. The gas-sensing properties of the TiO...
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