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Highly efficient one-step synthesis of carbon encapsulated nanocrystals by the oxidation of metal pi-complexes

机译：通过氧化金属Pi络合物氧化高效的一步合成碳包封的纳米晶体

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摘要

Various carbon encapsulated nanocrystals, including MnS and MnO, Cr2O3, MoO2, Fe7S8 and Fe3O4, and ZrO2, are prepared in one step and in situ by a simple and highly efficient synthesis approach. The nanocrystals have an equiaxed morphology and a median size smaller than 30 nm. Tens and hundreds of these nanocrystals are entirely encapsulated by a wormlike amorphous carbon shell. The formation of a core-shell structure depends on the strongly exothermic reaction of metal pi-complexes with ammonium persulfate in an autoclave at below 200 degrees C. During the oxidation process, the generated significant amounts of heat will destroy the molecular structure of the metal pi-complex and cleave the ligands into small carbon fragments, which further transform into an amorphous carbon shell. The central metal atoms are oxidized to metal oxide/sulfide nanocrystals. The formation of a core-shell structure is independent of the numbers of ligands and carbon atoms as well as the metal types, implying that any metal pi-complex can serve as a precursor and that various carbon encapsulated nanocrystals can be synthesized by this method.
机译：各种碳包封的纳米晶体，包括Mn和MnO，Cr 2 O 3，MOO2，Fe7S8和Fe 3 O 4和ZrO2，通过简单且高效的合成方法原位制备。纳米晶体具有等式的形态，中位数小于30nm。这些纳米晶体中的数十和数百种由蜗壳状无定形碳壳完全封装。核心壳结构的形成取决于金属Pi-络合物在高压釜中在高于200℃的高压釜中对铵过硫酸铵的强热反应。在氧化过程中，产生的大量热量将破坏金属的分子结构Pi-复合物并将配体切割成小碳片段，进一步转化为无定形碳壳。中央金属原子被氧化成金属氧化物/硫化物纳米晶体。核心壳结构的形成与配体和碳原子的数量无关以及金属类型，这意味着任何金属Pi-复合物都可以用作前体，并且可以通过该方法合成各种碳包封的纳米晶体。

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