Center for Nanoparticle Research, Institute for Basic Science (IBS), and School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea.
Science. 2013 May 24;340(6135):964-8. doi: 10.1126/science.1234751.
Galvanic replacement reactions provide a simple and versatile route for producing hollow nanostructures with controllable pore structures and compositions. However, these reactions have previously been limited to the chemical transformation of metallic nanostructures. We demonstrated galvanic replacement reactions in metal oxide nanocrystals as well. When manganese oxide (Mn3O4) nanocrystals were reacted with iron(II) perchlorate, hollow box-shaped nanocrystals of Mn3O4/γ-Fe2O3 ("nanoboxes") were produced. These nanoboxes ultimately transformed into hollow cagelike nanocrystals of γ-Fe2O3 ("nanocages"). Because of their nonequilibrium compositions and hollow structures, these nanoboxes and nanocages exhibited good performance as anode materials for lithium ion batteries. The generality of this approach was demonstrated with other metal pairs, including Co3O4/SnO2 and Mn3O4/SnO2.
电置换反应为制备具有可控孔结构和组成的中空纳米结构提供了一种简单而通用的方法。然而，这些反应以前仅限于金属纳米结构的化学转化。我们还证明了电置换反应在金属氧化物纳米晶体中也是可行的。当氧化锰 (Mn3O4) 纳米晶体与高氯酸铁(II) 反应时，生成了 Mn3O4/γ-Fe2O3 的中空盒状纳米晶体（“纳米盒”）。这些纳米盒最终转化为中空笼状纳米晶体的 γ-Fe2O3（“纳米笼”）。由于其非平衡组成和中空结构，这些纳米盒和纳米笼作为锂离子电池的阳极材料表现出良好的性能。通过其他金属对，包括 Co3O4/SnO2 和 Mn3O4/SnO2，证明了这种方法的通用性。
