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Highly ordered TiO2 nanotubes were prepared by anodization, and decorated with SnO2 nanoparticles via a facile impregnation method. SnO2 loading remarkably enhanced the H2 gas sensing performance of the TiO2 nanotubes. The sample impregnated with a precursor of 5 mM concentration exhibited the highest response and lowest operation temperature, achieving a 30-fold increased response of 1410 to 1000 ppm...