Enhanced Gas-Sensing Performance of Fe-Doped Ordered Mesoporous NiO with Long-Range Periodicity

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• 作者：Xiaohong Sun ; Xudong Hu ; Yongchao Wang ; Rui Xiong ; Xin Li ; Jing Liu ; Huiming Ji ; Xiaolei Li ; Shu Cai ; Chunming Zheng
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：February 12, 2015
• 年：2015
• 卷：119
• 期：6
• 页码：3228-3237
• 全文大小：604K
• ISSN：1932-7455

文摘

This paper reports the effect of mesoporous morphology and metal doping on the gas-sensing behavior of ordered mesoporous nickel oxide (NiO) materials. NiO samples with varied porous periodicity have been successfully synthesized via an improved nanocasting method. TEM, SEM, SAXRD, XRD, and nitrogen physisorption techniques are used to prove the presence of different mesostructured periodicity, as well as crystallinity, particle size, and pore size distribution of the as-synthesized NiO. The gas-sensing characterization indicates that the ordered mesoporous NiO with a long-range mesoporous periodicity based gas sensor exhibits a better ethanol sensing property than that of the ordered mesoporous NiO with short-range mesoporous periodicity. This result is due to the large specific surface area with sufficient sensing active sites, appropriate pore size distribution for enough gas diffusion, and proper particle size for effective charge accumulation of ordered mesoporous NiO with long-range periodicity. Furthermore, metal element doping, including Fe and Co, is used to adjust the sensitivity of the ordered mesoporous NiO based sensor. By doping of the Fe element on the optimizing mesoporous NiO, the gas-sensing property was obviously improved. The reason for that is attributed to the mesoporous structure and surface chemical state changed by the doping of Fe, resulting in more gas adsorption, diffusion, and reaction and attaining the enhanced gas-sensing performance.