Pt/TiO2纳米管阵列制备及其气敏性能研究

Highly ordered TiO2 nanotube arrays were prepared by anodic oxidation, and Pt nanoparticles were deposited on TiO2 nanotube arrays by solvothermal reduction method in the solution containing chloroplatinic acid and citric acid. Pt nanoparticles modified TiO2 nanotube arrays were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission transmission electron microscopy (FETEM) and energy dispersive spectroscopy (EDS). The results showed that the TiO2 nanotubes array with 120 nm in diameter and approximate 13 μm in length, and the deposited Pt nanoparticles with a particle size about 20nm were in an ordered assembly on the nanotubes with a uniform distribution. The as-prepared TiO2 nanotube arrays and Pt/TiO2 nanotube arrays were both evaluated for ethanol and oxygen gas sensing. The results showed that the Pt/TiO2 nanotube arrays exhibited much higher sensitivity, as well as the response speed, than the pure TiO2 nanotube arrays. After ten times cycling test, the gas sensing property of Pt/TiO2 nanotube arrays was still sensitive to ethanol. The gas sensing mechanism of TiO2 (Pt/TiO2) was also discussed in this paper.