Controlled Construction of Uniform Pompon-Shaped Microarchitectures Self-Assembled from Single-Crystalline Lanthanum Molybdate Nanoflakes

详细信息    查看全文

• 作者：Wenbo Bu ; Yunpeng Xu ; Na Zhang ; Hangrong Chen ; Zile Hua ; Jianlin Shi
• 刊名：Langmuir
• 出版年：2007
• 出版时间：August 14, 2007
• 年：2007
• 卷：23
• 期：17
• 页码：9002 - 9007
• 全文大小：768K
• 年卷期：v.23,no.17(August 14, 2007)
• ISSN：1520-5827

文摘

Uniform three-dimensional La₂(MoO₄)₃ nanostructures with a pompon shape have been successfully constructedby a simple surfactant-free hydrothermal approach via self-assembly from single-crystalline nanoflakes. The formationof the uniform pompon-shaped La₂(MoO₄)₃ microarchitectures is closely related to the presence of a proper amountof ammonium ions, and it is proposed that the pompon-shaped microarchitecture forms through an electrostaticattraction/repulsion effect between the oppositely charged flat surface and the edge of nanoflakes. Without the introductionof ammonium ions, no pompon-shaped microarchitectures can be formed, and while under the presence of excessammonium ions, the nanoflakes on the micropompons become amorphous, twisted, and rugged. The novelmicroarchitectures of the product can be successfully modified from spherical to columelliform by using a mixedsolvent of water/ethanol. This simple and efficient method may provide a practical reference to the controlled synthesisof other microarchitectures.