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

机译:室温下一步法合成有序NH3气体传感器的有序Pd @ TiO2纳米纤维阵列膜

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摘要

The one dimensional (1D) ordered porous Pd@TiO2 nanofibers (NFs) array film have been fabricated via a facile one-step synthesis of the electrospinning approach. The Pd@TiO2 NFs (PTND3) contained Pd (2.0 wt %) and C, N element (16.2 wt %) display high dispersion of Pd nanoparticles (NPs) on TiO2 NFs. Adding Pd meshed with C, N element to TiO2 based NFs might contribute to generation of Lewis acid sites and Brønsted acid sites, which have been recently shown to enhance NH3 adsorption-desorption ability; Pd NPs could increase the quantity of adsorbed O2 on the surface of TiO2 based NFs, and accelerated the O2 molecule-ion conversion rate, enhanced the ability of electron transmission. The response time of PTND3 sensor towards 100 ppm NH3 is only 3 s at room temperature (RT). Meantime, the response and response time of the PTND3 to the NH3 is 1 and 14s even at the concentration of 100 ppb. Therefore, the ordered Pd@TiO2 NFs array NH3 sensor display great potential for practical applications.
机译:一维(1D)有序的多孔Pd @ TiO2纳米纤维(NFs)阵列薄膜是通过电纺丝方法的简便的一步合成方法制成的。 Pd @ TiO2 NFs(PTND3)包含Pd(2.0 wt%)和C,N元素(16.2 wt%)在TiO2 NFs上显示Pd纳米颗粒(NPs)的高分散性。在TiO2基的NFs中加入与C,N元素啮合的Pd可能有助于产生Lewis酸位和Brønsted酸位,这些酸最近被证明可以增强NH3的吸附-解吸能力; Pd NPs可以增加TiO2基NFs表面的O2吸附量,并加速O2分子离子转化率,增强电子传输能力。在室温(RT)下,PTND3传感器对100 ppm NH3的响应时间仅为3 s。同时,即使在100 ppb的浓度下,PTND3对NH3的响应和响应时间也分别为1和14s。因此,有序Pd @ TiO2 NFs阵列NH3传感器在实际应用中显示出巨大的潜力。

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