Controllable Synthesis of ZnO with Various Morphologies by Hydrothermal Method
Controllable Synthesis of ZnO with Various Morphologies by Hydrothermal Method
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水热法可控合成不同形貌的ZnO
DOI：
10.1166/jnn.2012.5177
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发表时间：
2012-03-01
影响因子：
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通讯作者：
He, Nongyue
中科院分区：
文献类型：
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作者：
Li, Xiaolong;Zhang, Fengqin;He, Nongyue
采用不同的沉淀剂和锌源，采用水热法制备了不同形貌的氧化锌微结构。用X射线衍射仪和扫描电子显微镜对氧化锌、氢氧化锌和氧化锌的结构进行了表征，以了解沉淀剂和前驱体在各种形貌生长中的作用。通过改变沉淀剂，可以调节成核和生长过程。以H_2O_2为沉淀剂时，得到的氧化锌颗粒粒径较均匀，约为500 nm，表面较粗糙。而在这种聚乙烯吡咯烷酮(PVP)溶液中合成的氧化锌具有相同的颗粒形态，颗粒尺寸在300-1000 nm之间。相反，当分别使用氢氧化铵和碳酸氢铵时，则形成了由多个较小的多面体组成的多面体聚集体和多面体聚集体。同时，前驱体在确定氧化锌的形貌方面起着重要作用。以不同离心组成的氢氧化锌悬浮液为锌源，得到了向日葵状和哑铃状的纳米氧化锌。相反，用不同离心组分的氧化锌悬浮液作为锌源时，得到了由纳米棒和氧化锌棒组成的向日葵状和哑铃状的氧化锌。对不同锌源水热法制备的氧化锌纳米结构的生长机理进行了初步探讨。
ZnO microstructures with various morphologies have been controllably synthesized by hydrothermal route using different precipitant and zinc source in liquid solution. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the ZnO2, Zn(OH)(2) and ZnO structures to understand the role of precipitant and precursors in the growth of various morphologies. The nucleation and growth process can regulate by changing the precipitant. When H2O2 was used as precipitant, ZnO particles with a rather uniform particle size of similar to 500 nm and a rather rough surface was obtained. While, ZnO synthesized in this polyvinyl pyrrolidone (PVP) solution has the same granular morphology with particle size of 300-1000 nm. In contrast, ZnO sunflower and polyhedron aggregates composed of several smaller polyhedron were formed, when ammonium hydroxide and NH4HCO3 was applied, respectively. Meanwhile, precursors play an important role in the determination of the morphology of ZnO. Sunflower and dumbbell like ZnO composed of nanosheets were obtained, when different centrifugal component of Zn(OH)(2) suspension was applied as zinc source. In contrast, sunflower and dumbbell like ZnO composed of nanorods and ZnO rods were obtained, when different centrifugal components of ZnO2 suspension were used as zinc sources. The growth mechanism of ZnO nanostructures fabricated by the hydrothermal process using different zinc sources was tentatively investigated.