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The Fe 2 O 3 nanoparticles activated V 2 O 5 nanotubes were achieved via a hydrolysis method. The TEM and SEM images of the nanotubes indicated that the Fe 2 O 3 nanoparticles with the particle size of about 15nm were dispersed on the surface of the V 2 O 5 nanotubes. The activated nanotubes exhibited excellent response and selectivity...