The effect of template on morphology, optical and photocatalytic properties of ZnO nanostructures
The effect of template on morphology, optical and photocatalytic properties of ZnO nanostructures
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DOI：
10.1016/j.molliq.2012.08.019
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发表时间：
2012-11
影响因子：
6
通讯作者：
M. Sabbaghan;A. Firooz;V. Ahmadi
中科院分区：
文献类型：
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作者：
M. Sabbaghan;A. Firooz;V. Ahmadi
以蔗糖、甲基纤维素、十二烷基硫酸钠、酪蛋白为模板剂，采用简单的回流法制备了不同形貌的纳米氧化锌颗粒。利用X射线衍射仪、扫描电子显微镜、紫外可见吸收光谱和光致发光光谱等测试手段研究了这些氧化锌颗粒的结构和光学性质。表征结果表明，使用不同的模板剂，不仅可以防止锌物种的微晶尺寸急剧增大，而且可以为具有特殊形貌的初级纳米粒子的定向生长提供合适的条件。研究发现，不同形貌的氧化锌的形成可能涉及到预制核的作用，并使用模板来控制这些预制核的各个面的生长速度。光学结果表明，样品的形貌会影响与氧空位相关的发光强度和禁带宽度。此外，还考察了形态对亚甲基蓝溶液在太阳光直接照射下脱色的影响。75min后，纳米棒状氧化锌对亚甲基蓝的光脱色能力显著增强。
Different morphologies of nanocrystalline ZnO particles have been synthesized by a simple reflux method, using different templates as sucrose, methyl cellulose, sodium dodecylsulfate (SDS), and casein. The structural and optical properties of these ZnO particles are investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–Visible absorption, and photoluminescence (PL) spectroscopy. The characteristic results revealed that using different template not only prevent a drastic increase in the crystallite size of the zinc species but also provide suitable conditions for the oriented growth of primary nanoparticles with especial morphology. It was found that the formation of ZnO with various morphologies could involve the role of preformed “nucleus” and used templates to control the growth rate of various facets of these preformed nucleuses. Optical results reveal the morphology can affect the oxygen vacancies-related luminescence intensity and band gap of the samples. Also, the effect of morphology on the decolorization of methylene blue solution under direct irradiation of sunlight was investigated. Nanorod-like ZnO exhibited a significant enhancement of photodecolorization capability toward methylene blue after 75min.