In this work, anodization was utilized to synthesize highly ordered TiO 2 nanotube arrays, and ZnO was successfully decorated onto the surface of as-prepared TiO 2 nanotubes via a facile impregnation method. The gas sensing performance of a TiO 2 @ZnO composite was systematically studied. At a working temperature of 300 • C, the response of TiO 2 @ZnO to 100 ppm H 2 was ∼340, 2.7 times larger than that of pristine TiO 2 . A power-law relationship between the response and H 2 concentration was observed. In addition, the response time was significantly reduced by four times, and improved selectivity to H 2 was achieved. The highly improved sensing performance of TiO 2 nanotubes by ZnO decoration may be attributed to the enhanced oxygen adsorption and formation of n-n heterojunctions.
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