D. V. Sokolov, S. N. Nesov, Yu. A. Stenkin, V. V. Bolotov, K. E. Ivlev
{"title":"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","authors":"D. V. Sokolov, S. N. Nesov, Yu. A. Stenkin, V. V. Bolotov, K. E. Ivlev","doi":"10.1134/S2070205125700364","DOIUrl":null,"url":null,"abstract":"<p>Nonstoichiometric manganese oxide (MnO<sub>2–<i>x</i></sub>) layers with different ratios of MnO<sub>2</sub>, Mn<sub>2</sub>O<sub>3</sub>, 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 <i>p</i>-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 H<sub>2</sub>S-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, MnO<sub>4</sub> and Mn<sub>2</sub>O<sub>3</sub> 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%.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"61 2","pages":"277 - 290"},"PeriodicalIF":0.8000,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Gas-Sensing Properties Dependence of MnO–Mn2O3–MnO2 Systems on the Surface Structure and Chemical Composition at Multistage Isothermal Treatment\",\"authors\":\"D. V. Sokolov, S. N. Nesov, Yu. A. Stenkin, V. V. Bolotov, K. E. Ivlev\",\"doi\":\"10.1134/S2070205125700364\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Nonstoichiometric manganese oxide (MnO<sub>2–<i>x</i></sub>) layers with different ratios of MnO<sub>2</sub>, Mn<sub>2</sub>O<sub>3</sub>, 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 <i>p</i>-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 H<sub>2</sub>S-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, MnO<sub>4</sub> and Mn<sub>2</sub>O<sub>3</sub> 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%.</p>\",\"PeriodicalId\":745,\"journal\":{\"name\":\"Protection of Metals and Physical Chemistry of Surfaces\",\"volume\":\"61 2\",\"pages\":\"277 - 290\"},\"PeriodicalIF\":0.8000,\"publicationDate\":\"2025-09-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Protection of Metals and Physical Chemistry of Surfaces\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S2070205125700364\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"METALLURGY & METALLURGICAL ENGINEERING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Protection of Metals and Physical Chemistry of Surfaces","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S2070205125700364","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
The Gas-Sensing Properties Dependence of MnO–Mn2O3–MnO2 Systems on the Surface Structure and Chemical Composition at Multistage Isothermal Treatment
Nonstoichiometric manganese oxide (MnO2–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%.
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.
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