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The one dimensional (1D) ordered porous Pd@TiO 2  nanofibers (NFs) array film have been fabricated via a facile one-step synthesis of the electrospinning approach. The Pd@TiO 2  NFs (PTND3) contained Pd (2.0 wt %) and C, N element (16.2 wt %) display high dispersion of Pd nanoparticles (NPs) on TiO 2  NFs. Adding Pd meshed with C, N element to TiO 2  based NFs might contribute to generation of Lewis acid sites and Brønsted acid sites, which have been recently shown to enhance NH 3  adsorption-desorption ability; Pd NPs could increase the quantity of adsorbed O 2  on the surface of TiO 2  based NFs, and accelerated the O 2  molecule-ion conversion rate, enhanced the ability of electron transmission. The response time of PTND3 sensor towards 100 ppm NH 3  is only 3 s at room temperature (RT). Meantime, the response and response time of the PTND3 to the NH 3  is 1 and 14s even at the concentration of 100 ppb. Therefore, the ordered Pd@TiO 2  NFs array NH 3  sensor display great potential for practical applications.

One-step Synthesis of Ordered Pd@TiO2 Nanofibers Array Film as Outstanding NH3 Gas Sensor at Room Temperature