Facile post-synthesis and gas sensing properties of highly porous NiO microspheres
Facile post-synthesis and gas sensing properties of highly porous NiO microspheres
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DOI：
10.1016/j.sna.2019.07.014
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发表时间：
2019-09-01
影响因子：
4.6
通讯作者：
Nguyen Van Hieu
中科院分区：
文献类型：
--
作者：
Do Dang Trung;Nguyen Duc Cuong;Nguyen Van Hieu
以α-Ni(OH)(2)微花为前驱体，在不使用表面活性剂的情况下，采用水热法制备了多孔NiO微球。三维NiO微球的直径在2~10微米之间，由相连的NiO纳米颗粒组成，导致在热过程中从原始的α-Ni(OH)(2)纳米片层烧结和相变为NiO纳米颗粒。用硫化氢、氨气、氢气和一氧化碳等有毒和易燃气体对多孔NiO微球传感器进行了测试。与其他干扰气体相比，层次型多孔传感器对H_2S具有较高的选择性和灵敏度。这可能与NiO对硫化氢氧化的催化作用、Ni与S之间的化学亲和力适中以及多孔结构的良好排列等因素有关。结果表明，层次化多孔NiO微球作为气敏材料具有良好的H_2S检测性能。(C)2019爱思唯尔B.V.保留所有权利。
In this report, the porous NiO microspheres were fabricated by a post-simple route using alpha-Ni(OH)(2) microflowers as precursor that were synthesized by a hydrothermal method without using surfactants. The three-dimensional (3D) NiO microspheres ranging from 2 to 10 mu m in diameters composes of connected NiO nanoparticles, results in the sintering and phase transformation from primary alpha-Ni(OH)(2) nanosheets to NiO nanoparticles during thermal procedures. The porous NiO microspheres-based sensor was tested with some toxic and flammable gases including H2S, NH3, H-2, and CO. The hierarchical porous sensors exhibit high selectivity and sensitivity toward H2S in comparison with other interfering gases. The results may be related to some factors such as the catalytic effect of NiO on the oxidation of hydrosulfide, a moderately chemical affinity between Ni and S, and well-aligned porous architectures. The results exhibit the potential of hierarchical porous NiO microspheres as a gas-sensing material for excellent H2S detection. (C) 2019 Elsevier B.V. All rights reserved.