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Strong shape-dependence of Morin transition in α-Fe2O3 single-crystalline nanostructures

Nano Research 2015年第6期8卷 1906-1916页

作者： JunWang Victor Aguilar Le Li Fa-gen Li Wen-zhong Wang Guo-meng Zhao Department of Physics Faculty of Science Ningbo University Ningbo China Department of Physics and Astronomy California State University Los Angeles CA 90032 USA School of Science Minzu University of China Beijing 100081 China

Single-crystalline hematite （α-Fe2O3） nanorings （short nanotubes） and nanotubes were synthesized by a hydrothermal method. High-resolution transmission electron microscopy and selected-area electron diffraction confirm that the axial directions of both the nanorings and nanotubes are parallel to the crystalline c-axis. Intriguingly, the Morin transition occurs at about 210 K in the short nanotubes with a mean tube length of about 115 nm and a mean outer diameter of about 169 nm. However, it does not occur in the nanotubes with a mean tube length of about 317 nm and a mean outer diameter of about 148 nm. Detailed analysis of magnetization data, X-ray diffraction patterns, and room-temperature M6ssbauer spectra demonstrates that this very strong shape-dependence of Morin transition is intrinsic to hematite. We explain this intriguing shape- dependence quantitatively, in terms of the opposite signs of the surface mag- netic anisotropy constants of the surface planes parallel and perpendicular to the c-axis.

关键词： hematite nanostructures Morin transition shape-dependence surface magneticanisotropy

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A New Simple Route to ZnS Quantized Particles with Tunable Size and shape, and Size/shape-Dependent Optical Properties

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Advances in Materials Physics and Chemistry 2013年第1期3卷 10-18页

作者： Pengfei Hu Yali Cao Yanyan Lou Bo Lu Min Shao Jiansen Ni Meng Cao Institute of Applied Chemistry Xinjiang University Urumqi China. Laboratory for Microstructures Shanghai University Shanghai China Laboratory for Microstructures Shanghai University Shanghai China. School of Materials Science and Engineering Shanghai University Shanghai China.

With the features of convenience and eco-friendly, the low-temperature solid-state reaction synthesis was successfully developed as a new approach to prepare quantum-sized ZnS nanocrystals. One major achievement is that the size and shape of ZnS nanocrystals can be tuned by adjusting the surfactant and its feed. The UV-Vis absorption spectra of quasispherical and one-dimensional quantum-sized ZnS nanocrystals all showed a blue-shift from the bulk counterpart, indicating large quantum confinement effects of ZnS nanocrystals. These ZnS nanocrystals all showed well-defined excitonic emission features. Contrastive studies on photoluminescence performances indicated that the bandedge emission experienced only the size-dependent quantum confinement effect, while the trap-state emission experienced the size- and shape-dependences. So we can design a purposeful synthesis route to ZnS nanocrystals with target luminescence emission performances.

关键词： Solid-State Nanosynthesis Tunable Size- and shape-dependence Optical Properties

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