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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Correlation between the photocatalysis and growth mechanism of SnO2 nanocrystals
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Correlation between the photocatalysis and growth mechanism of SnO2 nanocrystals

机译:SnO2纳米晶体的光催化和生长机理的相关性

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Due to the special structural defects, SnO2-based nanomaterials show full potentials for applying to photocatalysis. In this work, we explore the relationship between photocatalysis and growth mechanism of SnO2 nanocrystals. Through a pH-modifying method, the growth of SnO2 nanocrystals follows Ostwald ripening (OR) mode at pH = 9, and oriented attachment (OA) mode at pH = 1.5, respectively. We comprehensively studied the structural characteristics of SnO2 nanocrystals by investigating high-resolution transmission electron microscope, x-ray diffraction, Brunauer-Emmett-Teller nitrogen physisorption, UV-vis diffuses reflectance, and photoluminescence spectra, and the results with growth dynamic simulation show that OA mode is obviously different from OR mode, and the photocatalytic performance of SnO2 nanocrystals varies under different growth mechanisms. The factors including crystal structure, particle size, and defects are all responsible for the variation of photocatalytic performance during OR or OA growth. Our study indicates that the photocatalytic performance of SnO2 nanocrystals can be tuned by the controlling of crystal growth mode.
机译:由于特殊的结构缺陷,基于SnO2的纳米材料显示出施加到光催化的全部电位。在这项工作中,我们探讨了SnO2纳米晶体的光催化和生长机制之间的关系。通过pH-修饰方法,SnO2纳米晶体的生长在pH = 9时遵循OSTWALD成熟(或)模式,并分别在pH = 1.5处取向附着(OA)模式。我们通过研究高分辨率透射电子显微镜,X射线衍射,Brunauer-Emmett氮原料,UV-VI扩散反射率和光致发光光谱来综合研究了SnO2纳米晶体的结构特征,以及生长动态模拟结果表明OA模式明显不同或模式,SnO2纳米晶体的光催化性能在不同的生长机制下变化。包括晶体结构,粒度和缺陷在内的因素全部负责光催化性能或OA生长的变化。我们的研究表明,通过控制晶体生长模式,可以通过控制SnO2纳米晶体的光催化性能。

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