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 |
| DOI | 10.1016/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 |
| 推荐引用方式 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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