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Shape-controlled Synthesis of Porous SnO2 Nanostructures via Morphologically Conserved Transformation from SnC2O4 Precursor Approach

ISSN号：0254-0150
期刊名称：《润滑与密封》
时间：0
分类：TB383.1[一般工业技术—材料科学与工程] TQ134.32[化学工程—无机化工]
作者机构：State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Graduate School of Chinese Academy of Sciences
相关基金：the financial support of the National Science Foundation for Distinguished Young Scholars of China(Grant No.51025517);the Innovative Group Foundation of NSFC(Grant No.50721062);the financial support of the National 973 project of China(2007CB607606)

作者： Qihua Wang, Dewei Wang, Tingmei Wang

中文摘要：

Porous SnO2 nanostructures with controlled shapes were synthesized by a facile morphologically conserved transformation from Sn C2O4 precursor approach. Well-defined Sn C2O4 nanostructures can be obtained through a solution-based precipitation process at ambient conditions without any surfactant. The formation mechanism of such microstructures was tentatively proposed on the basis of intrinsic crystal structure and the reaction conditions. We found that the morphologies of precursor were well maintained while numerous pores were formed during the annealing process. The combined techniques of X-ray diffraction, nitrogen absorption–desorption, field emission scanning electron microscopy, and（high-resolution） transmission electron microscopy were used to characterize the as-prepared SnO2 products. Moreover, cyclic voltammetry（CV） study shows that the shape of CV presents a current response like roughly rectangular mirror images with respect to the zero-current line without obvious redox peaks, which indicating an ideal capacitive behavior of the SnO2 electrodes. The photoluminescence（PL） spectrum study suggests that the as-obtained porous SnO2 nanostructures might have a large number of defects, vacancies of oxygen, and local lattice disorder at the interface, interior and exterior surfaces.

英文摘要：

Porous SnO2 nanostructures with controlled shapes were synthesized by a facile morphologically conserved transformation from SnC2O4 precursor approach. Well-defined SnC2O4 nanostructures can be obtained through a solution-based precipitation process at ambient conditions without any surfactant. The formation mechanism of such microstructures was tentatively proposed on the basis of intrinsic crystal structure and the reaction conditions. We found that the morphologies of precursor were well maintained while numerous pores were formed during the annealing process. The combined techniques of X-ray diffraction, nitrogen absorption-desorption, field emission scanning electron microscopy, and (high-resolution) transmission electron microscopy were used to characterize the as-prepared SnO2 products. Moreover, cyclic voltammetry (CV) study shows that the shape of CV presents a current response like roughly rectangular mirror images with respect to the zero-current line without obvious redox peaks, which indicating an ideal capacitive behavior of the SnO2 electrodes. The photoluminescence (PL) spectrum study suggests that the as-obtained porous SnO2 nanostructures might have a large number of defects, vacancies of oxygen, and local lattice disorder at the interface, interior and exterior surfaces.