Size and structure effect on optical transitions of iron oxide nanocrystals
文献类型：期刊论文
| 作者 | He, YP ; Miao, YM ; Li, CR ; Wang, SQ ; Cao, L ; Xie, SS ; Yang, GZ ; Zou, BS ; Burda, C |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2005 |
| 卷号 | 71期号:12 |
| 关键词 | ELECTRONIC EXCITATIONS NANOPARTICLES MAGNETITE SPECTRA ALPHA-FE2O3 FE2O3 PRESSURE FE3O4 |
| ISSN号 | 1098-0121 |
| 通讯作者 | He, YP (reprint author), Chinese Acad Sci, Inst Phys, Nanoscale Phys & Device Lab, POB 603, Beijing 100080, Peoples R China. |
| 中文摘要 | The heterogeneity of electronic states of transition metal oxides produces a variety of properties, which may be discerned by the measurements of their nanocrystals. The structure and optical spectra of chemically synthesized pure Fe(3)O(4), gamma-Fe(2)O(3), and alpha-Fe(2)O(3) nanocrystals of different sizes have been investigated. Three types of electronic transitions: ligand to metal charge-transfer transitions, strong magnetic coupled Fe 3, ligand field transitions, and pair excitations, occur distinctly in the optical spectra of gamma-Fe(2)O(3) and alpha-Fe(2)O(3) nanocrystals except Fe(3)O(4). The quantum size effect (for itinerant carriers) and finite size effect (for local magnetic moments) were observed in our nanocrystals, although their bulks are strong electron correlation systems. The localized to delocalized transformation of electrons occurs with time delay in the fermosecond transient absorption spectra of alpha-Fe(2)O(3) nanocrystal sol, which indicates that heteroresponse times for different transitions agree well with the size-dependent indication of the steady-state absorption bands of these iron oxides nanocrystals. These results are helpful in understanding the relationship among d-d transition, magnetic pairing, and charge-transfer in transition metal oxides. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/52671]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | He, YP,Miao, YM,Li, CR,et al. Size and structure effect on optical transitions of iron oxide nanocrystals[J]. PHYSICAL REVIEW B,2005,71(12). |
| APA | He, YP.,Miao, YM.,Li, CR.,Wang, SQ.,Cao, L.,...&Burda, C.(2005).Size and structure effect on optical transitions of iron oxide nanocrystals.PHYSICAL REVIEW B,71(12). |
| MLA | He, YP,et al."Size and structure effect on optical transitions of iron oxide nanocrystals".PHYSICAL REVIEW B 71.12(2005). |
入库方式： OAI收割
来源：物理研究所
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