One-step Synthesis of Ordered Pd@TiO(2) Nanofibers Array Film as Outstanding NH(3) Gas Sensor at Room Temperature

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.