Abstract
In this paper, a class of novel iron oxide particles has been fabricated through surfactant-directed structure approach in
hydrothermal reaction. The obtained iron oxide nanostructures with distinct morphologies, such as rhombohedra, octahedral,
plate-like, as well as dendritic, can be obtained by gradually increasing the concentrations of NaOH. The as-prepared iron
oxide particles were characterized utilizing scanning electronic microscopy (SEM), X-ray diffraction (XRD), and transmission
electron microscopy (TEM). Results reveal that the as-made particles, such as rhombohedra and octahedral, can be indexed as
pure rhombohedral phase of hematite and show better single crystalline feature. In contrast, when NaOH concentrations are
1.05 and 6 M, respectively, we accordingly can obtain novel flake-like and dendrtic superstructure that possess a mean arm
length of ~1.5 μm; both the as-made two samples can be easily indexed as a mixture of hematite and maghemite based on their
XRD and TEM results. Additionally, it was found that the obtained iron oxide samples at different NaOH concentrations show
obviously morphologies-dependent feature. Namely, the as-made samples can undergo transition from typical ferromagnetic to
ferrimagnetic behavior when the NaOH concentrations are gradually increased. In general, the presented synthesis approach
could be extended to prepare other metal oxides with specific morphology and structure.
hydrothermal reaction. The obtained iron oxide nanostructures with distinct morphologies, such as rhombohedra, octahedral,
plate-like, as well as dendritic, can be obtained by gradually increasing the concentrations of NaOH. The as-prepared iron
oxide particles were characterized utilizing scanning electronic microscopy (SEM), X-ray diffraction (XRD), and transmission
electron microscopy (TEM). Results reveal that the as-made particles, such as rhombohedra and octahedral, can be indexed as
pure rhombohedral phase of hematite and show better single crystalline feature. In contrast, when NaOH concentrations are
1.05 and 6 M, respectively, we accordingly can obtain novel flake-like and dendrtic superstructure that possess a mean arm
length of ~1.5 μm; both the as-made two samples can be easily indexed as a mixture of hematite and maghemite based on their
XRD and TEM results. Additionally, it was found that the obtained iron oxide samples at different NaOH concentrations show
obviously morphologies-dependent feature. Namely, the as-made samples can undergo transition from typical ferromagnetic to
ferrimagnetic behavior when the NaOH concentrations are gradually increased. In general, the presented synthesis approach
could be extended to prepare other metal oxides with specific morphology and structure.
- Content Type Journal Article
- DOI 10.1007/s10853-010-4733-8
- Authors
- Xiaohui Guo, Northwest University of China Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The College of Chemical & Materials Science Xi’an 710069 People’s Republic of China
- Shengliang Zhong, Jiangxi Normal University The College of Chemistry & Chemical Nanchang City 330022 China
- Ji Zhang, Northwest University of China Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The College of Chemical & Materials Science Xi’an 710069 People’s Republic of China
- Wanv Wang, Northwest University of China Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The College of Chemical & Materials Science Xi’an 710069 People’s Republic of China
- JianJiang Mao, Fudan University Department of Chemistry Shanghai 200433 People’s Republic of China
- Gang Xie, Northwest University of China Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The College of Chemical & Materials Science Xi’an 710069 People’s Republic of China
- Journal Journal of Materials Science
- Online ISSN 1573-4803
- Print ISSN 0022-2461
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