A nanocomposite superstructure of metal oxides with effective charge transfer interfaces
A nanocomposite superstructure of metal oxides with effective charge transfer interfaces
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DOI：
10.1038/ncomms4038
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发表时间：
2014-01-01
影响因子：
16.6
通讯作者：
Majima, Tetsuro
中科院分区：
文献类型：
--
作者：
Bian, Zhenfeng;Tachikawa, Takashi;Majima, Tetsuro
纳米粒子构建块排列成有序的上层结构是现代胶体和材料化学的关键课题之一。金属氧化物介晶是金属氧化物组装纳米颗粒的上层结构，具有潜在的可调电子、光学和磁性，可用于从催化到光电子的各种应用。在这里，我们报告了一种简单而通用的方法来合成金属氧化物介晶，并将其发展成含有两种不同金属的新型纳米复合材料。用电镜技术对介晶的表面和内部结构进行了全面表征。单粒子共聚焦荧光光谱、电子顺磁共振光谱和时间分辨漫反射光谱测量表明，复合介晶中n型和p型半导体纳米粒子之间发生了有效的电荷转移。这种行为对于它们的应用范围从催化、光电子学和传感到能量存储和转换都是理想的。
The alignment of nanoparticle building blocks into ordered superstructures is one of the key topics in modern colloid and material chemistry. Metal oxide mesocrystals are superstructures of assembled nanoparticles of metal oxides and have potentially tunable electronic, optical and magnetic properties, which would be useful for applications ranging from catalysis to optoelectronics. Here we report a facile and general approach for synthesizing metal oxide mesocrystals and developing them into new nanocomposite materials containing two different metals. The surface and internal structures of the mesocrystals were fully characterized by electron microscopy techniques. Single-particle confocal fluorescence spectroscopy, electron paramagnetic resonance spectroscopy and time-resolved diffuse reflectance spectroscopy measurements revealed that efficient charge transfer occurred between n-type and p-type semiconductor nanoparticles in the composite mesocrystals. This behaviour is desirable for their applications ranging from catalysis, optoelectronics and sensing, to energy storage and conversion.