期刊
CHEMISTRY OF MATERIALS
卷 24, 期 14, 页码 2722-2732出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm3008182
关键词
hybrid nanocrystals; colloidal synthesis; seeded growth; ferromagnetism; fluorescence; core-shell; zinc oxide; iron oxide
资金
- European Commission through the Marie-Curie Transfer of Knowledge program NANOTAIL [MTKD-CT-2006-042459]
Hybrid nanocrystals (HNCs), based on ZnO nanorods (NRs) decorated with magnetic Fe-based domains, were synthesized via a colloidal seeded-growth method. The approach involved heterogeneous nucleation of Fe nanocrystals on size-tailored ZnO nanorod seeds in a noncoordinating solvent, followed by partial surface oxidation of the former to the corresponding Fe@FexOy core@shell domains. HNCs with variable population and size of the Fe-based nanodomains could be synthesized depending on the surface reactivity of the ZnO seeds. The structure property relationships in these HNCs were carefully studied. In HNCs characterized by a large number of small Fe@FexOy core@shell nanodomains on the ZnO seed surface, the interfacial communication across the Fe-core and FexOy-shell generated a sizable exchange-bias effect mediated by frozen interfacial spins. On the other hand, in HNCs carrying a lower density of comparatively larger Fe@FexOy domains, partial removal of the Fe-core created an inner void in between that led to suppressed exchange coupling anisotropy. As a further proof of functionality, the HNCs exhibited pronounced band-edge ultraviolet fluorescence. The latter was blue-shifted compared to the parent ZnO NRs, inferring coupling of the semiconductor and magnet sections.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据