Double-Walled SnO2 Nano-Cocoons with Movable Magnetic Cores


  • We thank Mr. Yasuyuki and Prof. H. D. Abruña for useful discussions, Mr. Chris Orilall for BET measurement. We are grateful to the National Science Foundation (DMR 0404278) for supporting this study. Facilities available through the Cornell Center for Materials Research (CCMR), a Materials Research Science and Engineering Center of the National Science Foundation (DMR 0079992) were used for this study. Supporting Information is available online from Wiley InterScience or from the authors.


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Double-walled SnO2nano-cocoons with movable α-Fe2O3cores have been prepared by hydrothermal shell-by-shell deposition of polycrystalline SnO2 on ellipsoidal α-Fe2O3/SiO2 core/shell nanotemplates followed by removal of SiO2. The present templating approach also leads to two other nano-architectures, namely single-walled and porous double-shelled nano-cocoons. The α-Fe2O3 cores can be reduced to magnetic Fe3O4 post-synthesis.