中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
In situ ambient pressure XPS observation of surface chemistry and electronic structure of α-Fe2O3and γ-Fe2O3nanoparticles

文献类型:期刊论文

作者Flak, Dorota1,2,3; Chen, Qianli3,4; Mun, Bongjin Simon5; Liu, Zhi6; Rkas, Mieczyslaw2; Braun, Artur3
刊名Applied Surface Science
出版日期2018
卷号455页码:1019-1028
ISSN号01694332
DOI10.1016/j.apsusc.2018.06.002
英文摘要Fundamental understanding of charge transfer reaction is essential for the surface and interface engineering of transition metal oxides. In this study the chemical reactivity towards oxygen and hydrogen (13 Pa) under applied thermal conditions (423–673 K), of two polymorphic forms of Fe2O3nanoparticles (γ-Fe2O3and α-Fe2O3) are investigated with the combination of in situ ambient pressure X-ray photoelectron spectroscopy (AP-XPS) and near edge X-ray absorption fine structure spectroscopy (AP-NEXAFS). Our data show that the reactivity of these two polymorphs has a similar character based on the contribution of oxygen vacancy defect states and related material non-stoichiometry. Their exposure to hydrogen at increased temperature results in both cases in the surface reduction. However, γ-Fe2O3exhibits more covalent character and undergoes the reduction preferentially with a contribution of metallic Fe0than Fe2+, in contrast to α-Fe2O3. Further, upon introduction of oxygen at low temperature of 423 K, rapid re-oxidation process takes place at the Fe2O3nanoparticles surface. Prepared γ-Fe2O3and α-Fe2O3nanostructures exhibit in general high n-type and p-type sensor response towards hydrogen, respectively, in a wide concentrations range. © 2018 Elsevier B.V.
出版者Elsevier B.V.
源URL[http://ir.sic.ac.cn/handle/331005/25337]  
专题中国科学院上海硅酸盐研究所
作者单位1.NanoBioMedical Centre, Adam Mickiewicz University in Pozna, Umultowska 85, Pozna; 61-614, Poland;
2.Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, Kraków; 30-059, Poland;
3.Laboratory for High Performance Ceramics, Empa. Swiss Federal Laboratories for Materials Science and Technology, Dübendorf; CH-8600, Switzerland;
4.University of Michigan – Shanghai Jiao Tong University Joint Institute, 800 Dong Chuan Road, Shanghai; 200240, China;
5.Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju; 500-712, Korea, Republic of;
6.Advanced Light Source, Lawrence Berkeley National Laboratory, 17, Berkeley; CA; 94720, United States
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GB/T 7714
Flak, Dorota,Chen, Qianli,Mun, Bongjin Simon,et al. In situ ambient pressure XPS observation of surface chemistry and electronic structure of α-Fe2O3and γ-Fe2O3nanoparticles[J]. Applied Surface Science,2018,455:1019-1028.
APA Flak, Dorota,Chen, Qianli,Mun, Bongjin Simon,Liu, Zhi,Rkas, Mieczyslaw,&Braun, Artur.(2018).In situ ambient pressure XPS observation of surface chemistry and electronic structure of α-Fe2O3and γ-Fe2O3nanoparticles.Applied Surface Science,455,1019-1028.
MLA Flak, Dorota,et al."In situ ambient pressure XPS observation of surface chemistry and electronic structure of α-Fe2O3and γ-Fe2O3nanoparticles".Applied Surface Science 455(2018):1019-1028.

入库方式: OAI收割

来源:上海硅酸盐研究所

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