Novel Nanocrystal Heterostructures: Crystallographic-Oriented Growth of SnO2 Nanorods onto α-Fe2O3 Nanohexahedron

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• 作者：Mutong Niu ; Yao Cheng ; Yuansheng Wang ; Lifeng Cui ; Feng Bao ; Lihua Zhou
• 刊名：Crystal Growth & Design
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：8
• 期：5
• 页码：1727 - 1729
• 全文大小：449K
• 年卷期：v.8,no.5(May 2008)
• ISSN：1528-7505

文摘

The novel SnO₂/α-Fe₂O₃ semiconductor nanocrystal heterostructures (SNCHs) were fabricated by virtue of the crystallographic-oriented growth of the SnO₂ nanorods onto the α-Fe₂O₃ nanohexahedrons via a reverse microemulsion route. The variation of the exposure surfaces of the α-Fe₂O₃ precursor crystals was found to result in the change of the preferential crystallographic orientation of the SnO₂ nanorods. The investigations on the structural characteristics and the morphological evolution of the SnO₂/α-Fe₂O₃ SNCHs suggested that the heteronucleation and homonucleation of SnO₂ occurred simultaneously at the early stage of the reaction, and the SnO₂/α-Fe₂O₃ SNCHs were then well-formed by a mechanism of Ostwald ripening of the heteronucleated SnO₂ particles. The “lattice dislocations” generated at the SnO₂/α-Fe₂O₃ interfaces took the role to relieve the interfacial strain and thus facilitated the formation of the definite interfaces.