Kim Kyoung Hwan, Lee Dong Jin, Cho Kyeong Min, Kim Seon Joon, Park Jung-Ki, Jung Hee-Tae
Department of Chemical and Biomolecular Engineering (BK21+Program), Korea Advance Institute of Science and Technology (KAIST), Daejeon 305-701 (Korea).
Sci Rep. 2015 Mar 11;5:9014. doi: 10.1038/srep09014.
Owing to its simplicity and low temperature conditions, magnesiothermic reduction of silica is one of the most powerful methods for producing silicon nanostructures. However, incomplete reduction takes place in this process leaving unconverted silica under the silicon layer. This phenomenon limits the use of this method for the rational design of silicon structures. In this effort, a technique that enables complete magnesiothermic reduction of silica to form silicon has been developed. The procedure involves magnesium promoted reduction of vertically oriented mesoporous silica channels on reduced graphene oxides (rGO) sheets. The mesopores play a significant role in effectively enabling magnesium gas to interact with silica through a large number of reaction sites. Utilizing this approach, highly uniform, ca. 10 nm sized silicon nanoparticles are generated without contamination by unreacted silica. The new method for complete magnesiothermic reduction of mesoporous silica approach provides a foundation for the rational design of silicon structures.
由于其简单性和低温条件，二氧化硅的镁热还原是生产硅纳米结构最有效的方法之一。然而，在此过程中会发生不完全还原，在硅层下方留下未转化的二氧化硅。这种现象限制了该方法在硅结构合理设计中的应用。在此研究中，已开发出一种能够使二氧化硅完全镁热还原以形成硅的技术。该过程涉及在还原氧化石墨烯（rGO）片上镁促进垂直取向的介孔二氧化硅通道的还原。介孔在有效地使镁气通过大量反应位点与二氧化硅相互作用方面起着重要作用。利用这种方法，可以生成高度均匀的、约10纳米大小的硅纳米颗粒，且不会被未反应的二氧化硅污染。介孔二氧化硅完全镁热还原的新方法为硅结构的合理设计提供了基础。
