Hydrothermal Growth and Morphology Modification of -NiS Three-Dimensional Flowerlike Architectures

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• 作者：Haibo Li ; Lanlan Chai ; Xiaoqing Wang ; Xueying Wu ; Guangcheng Xi ; Yankuan Liu ; Yitai Qian
• 刊名：Crystal Growth & Design
• 出版年：2007
• 出版时间：September 2007
• 年：2007
• 卷：7
• 期：9
• 页码：1918 - 1922
• 全文大小：491K
• 年卷期：v.7,no.9(September 2007)
• ISSN：1528-7505

文摘

A series of ges/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-NiS three-dimensional (3D) flowerlike architectures with an average diameter of 2-4 ges/entities/mgr.gif">m have beenhydrothermally synthesized in the presence of ammonia and trisodium citrate. Morphology modification can be conveniently realizedby varying the reaction temperature. At 120 ges/entities/deg.gif">C the flowerlike architectures were composed of nanoneedles. At 180 ges/entities/deg.gif">C the flowerlikearchitectures were composed of nanorods, while mixtures of nanoneedle-based and nanorod-based flowerlike architectures wereobtained in the temperature range of 140-160 ges/entities/deg.gif">C. Citrate anion was introduced as both a coordinating reagent and a shape modifierto control the anisotropic growth of ges/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-NiS. Besides a probable growth mechanism, the citrate-assisted Ostwald ripening process wasproposed to explain the formation of flowerlike architectures on the basis of transmission electron microscopy observations. Sucha simple and mild synthetic route may be extended to fabricate complex 3D architectures of other materials.