具有界面介导交换偏置和带边紫外荧光的各向异性ZnO-Fe @ FexOy纳米结构
Colloidal Anisotropic ZnO-Fe@FexOy Nanoarchitectures with Interface-Mediated Exchange-Bias and Band-Edge Ultraviolet Fluorescence
摘要：
采用胶体晶种生长法合成了基于ZnO纳米棒的铁基磁性畴结构的杂化纳米晶。该方法涉及在非配位溶剂中的尺寸定制的ZnO纳米棒种子上的Fe纳米晶体的非均质成核，然后将前者部分表面氧化为相应的Fe@FexOy核@壳域。根据ZnO晶种的表面反应性，可以合成具有可变数量和尺寸的Fe基纳米畴的HNC。在这些HNC的结构与性能的关系进行了仔细的研究。在HNC的特征在于大量的小Fe@FexOy核@壳纳米结构域的ZnO种子表面上，在Fe-核和FexOy-壳的界面通信产生了相当大的交换偏置效应介导的冻结界面自旋。另一方面，在携带较低密度的相对较大的Fe@FexOy域的HNC中，Fe核的部分去除在其间产生内部空隙，这导致抑制的交换耦合各向异性。作为功能性的进一步证明，HNC表现出明显的带边紫外荧光。后者是蓝移相比，父母ZnO NR，推断耦合的半导体和磁体部分。
英文摘要：
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 sizeable 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.
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