Sorbonne Université, CNRS, Collège de France, Laboratoire Chimie de la Matière Condensée de Paris, LCMCP, 4 Place Jussieu, F-75005 Paris, France.
Dalton Trans. 2018 Jun 12;47(23):7634-7639. doi: 10.1039/c8dt00932e.
Inorganic nanocomposites made of an inorganic matrix containing nanoparticle inclusions provide materials of advanced mechanical, magnetic, electrical properties and multifunctionality. The range of compounds that can be implemented in nanocomposites is still narrow and new preparation methods are required to design such advanced materials. Herein, we describe how the combination of nanocrystal synthesis in molten salts with subsequent heat treatment at a pressure in the GPa range gives access to a new family of boron-based nanocomposites. With the case studies of HfB2/β-HfB2O5 and CaB6/CaB2O4(iv), we demonstrate by X-ray diffraction and through (scanning) transmission electron microscopy the crystallization of borate matrices into rare compounds and unique nanostructured solids, while metal boride nanocrystals remain dispersed in the matrix and maintain small sizes below 30 nm, thus demonstrating a new multidisciplinary approach toward nanoscaled heterostructures.
由包含纳米颗粒的无机基质制成的无机纳米复合材料为具有先进机械、磁、电性能和多功能性的材料提供了可能。可以在纳米复合材料中实现的化合物的范围仍然很窄，需要新的制备方法来设计这种先进材料。在此，我们描述了如何将熔融盐中的纳米晶体合成与随后在 GPa 范围内的压力下进行热处理相结合，从而获得一系列新的硼基纳米复合材料。通过 HfB2/β-HfB2O5 和 CaB6/CaB2O4(iv) 的案例研究，我们通过 X 射线衍射和（扫描）透射电子显微镜证明了硼酸盐基质结晶为稀有化合物和独特的纳米结构固体，而金属硼化物纳米晶体则分散在基质中并保持在 30nm 以下的小尺寸，从而展示了一种新的多学科方法来实现纳米级异质结构。
