Template-free hydrothermal synthesis of single-crystalline SnO2 nanocauliflowers and their optical properties
来源期刊：Rare Metals2009年第5期
论文作者：WANG Yalia, GUO Mina, ZHANG Meia, and WANG Xidongb a School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing , China b College of Engineering, Peking University, Beijing , China
文章页码：449 - 453
摘 要：Large-scale single-crystalline SnO2 nanocauliflowers were successfully synthesized using a hydrothermal growth method without any template. The samples were characterized by X-ray diffraction （XRD）, field-emission scanning electron microscopy （FE-SEM）, en- ergy-dispersive X-ray spectroscopy （EDS）, transmission electron microscopy （TEM）, and selected area electron diffraction （SAED）. FE-SEM images show that the as-grown SnO2 nanocauliflowers are constructed of tetragonal prisms with a width of 500-600 nm. XRD, EDS, and SAED results indicate that the as-grown SnO2 nanocauliflowers are single crystalline with the tetragonal rutile crystalline structure. The growth mechanism of SnO2 nanocauliflowers is also preliminarily discussed on the basis of different Sn（OH） 62- concentrations, and it is found that Sn（OH） 62- concentration plays an important role in determining the shape of the prepared SnO2. Room temperature photoluminescence was further carried out on SnO2 nanocauliflowers to investigate their optical properties. An intense blue luminescence centered at a wavelength of 424 nm is observed in the as-grown SnO2 nanocauliflowers.
WANG Yalia, GUO Mina, ZHANG Meia, and WANG Xidongb a School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China b College of Engineering, Peking University, Beijing 100871, China
摘 要：Large-scale single-crystalline SnO2 nanocauliflowers were successfully synthesized using a hydrothermal growth method without any template. The samples were characterized by X-ray diffraction （XRD）, field-emission scanning electron microscopy （FE-SEM）, en- ergy-dispersive X-ray spectroscopy （EDS）, transmission electron microscopy （TEM）, and selected area electron diffraction （SAED）. FE-SEM images show that the as-grown SnO2 nanocauliflowers are constructed of tetragonal prisms with a width of 500-600 nm. XRD, EDS, and SAED results indicate that the as-grown SnO2 nanocauliflowers are single crystalline with the tetragonal rutile crystalline structure. The growth mechanism of SnO2 nanocauliflowers is also preliminarily discussed on the basis of different Sn（OH） 62- concentrations, and it is found that Sn（OH） 62- concentration plays an important role in determining the shape of the prepared SnO2. Room temperature photoluminescence was further carried out on SnO2 nanocauliflowers to investigate their optical properties. An intense blue luminescence centered at a wavelength of 424 nm is observed in the as-grown SnO2 nanocauliflowers.
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