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.