The Gas-Sensing Properties Dependence of MnO–Mn2O3–MnO2 Systems on the Surface Structure and Chemical Composition at Multistage Isothermal Treatment

IF 0.8 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Protection of Metals and Physical Chemistry of Surfaces Pub Date : 2025-09-26 DOI:10.1134/S2070205125700364

D. V. Sokolov, S. N. Nesov, Yu. A. Stenkin, V. V. Bolotov, K. E. Ivlev

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Abstract

Nonstoichiometric manganese oxide (MnO_2–x) layers with different ratios of MnO₂, Mn₂O₃, and MnO were prepared by step isothermal annealing at 850°C in 20 min points. A gradual change in surface morphology and crystal structure from bixbyite to hausmannite with increasing annealing time from 5 to 65 min is shown. The manganese oxides layers demonstrated p-type conductivity due to the presence of hydroxyl groups, which was confirmed by XPS spectra. According to the gas sensing study, all the obtained layers had H₂S-selectivity at 200°C among other gases: nitrogen dioxide, ammonia, and vapors of phenol, acetonitrile, and formaldehyde. At the 2nd and 3–4th annealing cycles, MnO₄ and Mn₂O₃ oxides predominated on the surface, respectively. Between these transitions, the response to hydrogen sulfide increased at least 2 times. The maximum response to 800 ppm hydrogen sulfide was found after 3rd isothermal treatment and averaged 94%.

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多级等温处理中MnO-Mn2O3-MnO2体系气敏性能对表面结构和化学成分的影响

在850℃、20 min的温度下，采用等温逐步退火的方法制备了MnO2、Mn2O3和MnO配比不同的非化学计量氧化锰（MnO2 - x）层。随着退火时间从5 ~ 65 min的增加，表面形貌和晶体结构逐渐由bixbyite变为hausmanite。由于羟基的存在，锰氧化物层表现出p型电导率，XPS光谱证实了这一点。根据气体传感研究，所有获得的层在200°C时对其他气体（二氧化氮，氨，苯酚，乙腈和甲醛蒸气）具有h2s选择性。在第2次和第3 - 4次退火循环中，MnO4和Mn2O3氧化物分别在表面占主导地位。在这些转变之间，对硫化氢的反应至少增加了2倍。当硫化氢浓度为800 ppm时，第三次等温处理达到最大响应，平均为94%。

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来源期刊

Protection of Metals and Physical Chemistry of Surfaces 工程技术-冶金工程

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Protection of Metals and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles covering all aspects of the physical chemistry of materials and interfaces in various environments. The journal covers all related problems of modern physical chemistry and materials science, including: physicochemical processes at interfaces; adsorption phenomena; complexing from molecular and supramolecular structures at the interfaces to new substances, materials and coatings; nanoscale and nanostructured materials and coatings, composed and dispersed materials; physicochemical problems of corrosion, degradation and protection; investigation methods for surface and interface systems, processes, structures, materials and coatings. No principe restrictions exist related systems, types of processes, methods of control and study. The journal welcomes conceptual, theoretical, experimental, methodological, instrumental, environmental, and all other possible studies.