Growth and Properties of Single-Crystalline -Fe2O3 Nanowires
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- 作者：Qin Han ; Zhenghui Liu ; Yingying Xu ; Ziyu Chen ; Tianmin Wang ; Han Zhang
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：April 5, 2007
- 年：2007
- 卷：111
- 期：13
- 页码：5034 - 5038
- 全文大小：538K
- 年卷期：v.111,no.13(April 5, 2007)
- ISSN：1932-7455
文摘
By carefully controlling the reacting conditions, including atmosphere, temperature, and time, we directlyacquire the nanowires of 
-Fe2O3 from the nanowires of 
-Fe2O3 in a reduced atmosphere. X-ray diffraction,X-ray photoelectron spectroscopy, Raman spectrum, and transmission electronic microscope analysesdemonstrate that the nanowires are single-crystalline -Fe2O3. The nanowires have a diameter ranging from50 to 90 nm and their typical lengths are in the range of 10~20 
m. The optical property of the nanowiresis observed by photoluminescence spectrum. The magnetic behavior of it is investigated by a magnetic propertymeasurement system. The blocking temperature is found to be about 200 K. In addition, the mechanism ofthe transformation from -Fe2O3 nanowires to -Fe2O3 nanowires is preliminarily studied by ab initio approach.It is found that the role of H2 is to change the Fe-O bonds in -Fe2O3 nanowires, and then -Fe2O3 istransformed into -Fe2O3.
-Fe2O3 from the nanowires of -Fe2O3 in a reduced atmosphere. X-ray diffraction,X-ray photoelectron spectroscopy, Raman spectrum, and transmission electronic microscope analysesdemonstrate that the nanowires are single-crystalline -Fe2O3. The nanowires have a diameter ranging from50 to 90 nm and their typical lengths are in the range of 10~20 m. The optical property of the nanowiresis observed by photoluminescence spectrum. The magnetic behavior of it is investigated by a magnetic propertymeasurement system. The blocking temperature is found to be about 200 K. In addition, the mechanism ofthe transformation from -Fe2O3 nanowires to -Fe2O3 nanowires is preliminarily studied by ab initio approach.It is found that the role of H2 is to change the Fe-O bonds in -Fe2O3 nanowires, and then -Fe2O3 istransformed into -Fe2O3.