Seed-induced growth of flower-like Au-Ni-ZnO metal-semiconductor hybrid nanocrystals for photocatalytic applications.
Seed-induced growth of flower-like Au-Ni-ZnO metal-semiconductor hybrid nanocrystals for photocatalytic applications.
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DOI：
10.1002/smll.201401853
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发表时间：
2015-03
期刊：
影响因子：
13.3
通讯作者：
Yuanzhi Chen;Deqian Zeng;M. Cortie;A. Dowd;Huizhang Guo;Junbao Wang;D. Peng
中科院分区：
文献类型：
--
作者：
Yuanzhi Chen;Deqian Zeng;M. Cortie;A. Dowd;Huizhang Guo;Junbao Wang;D. Peng
金属和半导体成分在纳米尺度上结合形成杂化纳米晶体，为实现具有特殊光学、磁性和光催化功能的先进功能材料提供了重要途径。在此，报道了一种简便的溶液法，用于合成具有花状形貌和多功能特性的 Au-Ni-ZnO 金属-半导体杂化纳米晶体。该合成策略使用原位形成的贵金属和磁性金属 Au@Ni 纳米晶体种子来诱导半导体 ZnO 纳米金字塔异质外延生长到金属核的表面上。尽管半导体和磁性元件之间存在较大的晶格失配，但在异质结上观察到 ZnO{0001} 面在 Ni {111} 面上外延生长的证据。调整Au和Ni前驱体的量可以控制金属核的尺寸和成分，从而改变表面等离子体共振（SPR）和磁性能。通过调整镍核的尺寸可以实现室温超顺磁性。所制备的 Au-Ni-ZnO 纳米晶体具有很强的光催化作用，并且可以凭借其磁性进行分离和回收。单个混合纳米晶体中等离子体、半导体和磁性成分的同时组合为其提供了多功能性，可能具有广泛的潜在应用。
The combination of metal and semiconductor components in nanoscale to form a hybrid nanocrystal provides an important approach for achieving advanced functional materials with special optical, magnetic and photocatalytic functionalities. Here, a facile solution method is reported for the synthesis of Au-Ni-ZnO metal-semiconductor hybrid nanocrystals with a flower-like morphology and multifunctional properties. This synthetic strategy uses noble and magnetic metal Au@Ni nanocrystal seeds formed in situ to induce the heteroepitaxial growth of semiconducting ZnO nanopyramids onto the surface of metal cores. Evidence of epitaxial growth of ZnO{0001} facets on Ni {111} facets is observed on the heterojunction, even though there is a large lattice mismatch between the semiconducting and magnetic components. Adjustment of the amount of Au and Ni precursors can control the size and composition of the metal core, and consequently modify the surface plasmon resonance (SPR) and magnetic properties. Room-temperature superparamagnetic properties can be achieved by tuning the size of Ni core. The as-prepared Au-Ni-ZnO nanocrystals are strongly photocatalytic and can be separated and re-cycled by virtue of their magnetic properties. The simultaneous combination of plasmonic, semiconducting and magnetic components within a single hybrid nanocrystal furnishes it multifunctionalities that may find wide potential applications.