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Highly sensitive detection of ammonia gas by 3D flower-like ɤ-MnO2 nanostructure chemiresistor
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2020-06-11 , DOI: 10.1016/j.jtice.2020.04.017
Mohammad Reza Sovizi , Somayeh Mirzakhani

In this work, a ɤ-MnO2 flower-like nanostructure was synthesized. The structural and morphological characterization of ɤ-MnO2 flower-like nanostructure was performed by X-ray powder diffraction (XRD), N2–sorption studies (Brunauer–Emmett–Teller surface area measurements) (BET), particle size distribution (PSA), energy dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM). The ammonia gas sensor was fabricated based on the high surface area of ɤ-MnO2 flower-like nanostructure. According to the results, tetragonal tunnels were advantageous for trapping and adsorption-desorption of NH3 gas molecules. The results indicated that the gas sensor based on ɤ-MnO2 flower-like nanostructure had high sensitivity (40% response to 100 mg L−1 NH3 gas), selectivity, detectability up to 2 mg L−1 NH3 gas, long-term stability, and repeatability for two months at room temperature. Of the study also examined the effect of compounds such as ethanol, acetone, hydrazine, n-heptane, monomethylamine (MMA), triethylamine (TEA) and trimethylamine (TMA) on the detection of ammonia gas.



中文翻译:

高灵敏度的检测氨气通过3D花状ɤ-的MnO 2纳米结构的化学电阻器

在这项工作中,ɤ-的MnO 2花状纳米结构的合成。X -MnO 2花状纳米结构的结构和形态表征是通过X射线粉末衍射(XRD),N 2-吸附研究(Brunauer-Emmett-Teller表面积测量)(BET),粒度分布(PSA)进行的),能量色散X射线光谱仪(EDS)和扫描电子显微镜(SEM)。基于ɤ-的MnO的高表面积的氨气传感器制作2花状纳米结构。根据该结果,四方隧道有利于NH 3气体分子的捕集和吸附-解吸。结果表明,基于ɤ-MnO的气体传感器2花状纳米结构具有高灵敏度(对100 mg L -1 NH 3气体有40%的响应),选择性,高达2 mg L -1 NH 3气体的可检测性,长期稳定性以及在室温下两个月的可重复性。研究中还检查了乙醇,丙酮,肼,正庚烷,单甲胺(MMA),三乙胺(TEA)和三甲胺(TMA)等化合物对氨气检测的影响。

更新日期:2020-07-20
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