Air-stable n-type Fe-doped ZnO colloidal nanocrystals
Air-stable n-type Fe-doped ZnO colloidal nanocrystals
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DOI：
10.1063/1.5124947
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发表时间：
2019-10-07
影响因子：
4.4
通讯作者：
Kittilstved, Kevin R.
中科院分区：
文献类型：
--
作者：
Buz, Enes;Zhou, Dongming;Kittilstved, Kevin R.
采用改进的腐蚀-再生长-掺杂法合成了Al和Fe共掺杂的ZnO纳米晶。我们发现，与Fe 3+在ZnO中的光谱签名消失后，引入Al 3+施主缺陷到ZnO晶格。Al 3+的存在下证实了一个本地化的表面等离子体共振功能的外观，表明过量的自由载流子在共掺杂的NC。这些光谱变化表明，Al 3+掺杂导致Fe 3+掺杂剂还原为在环境条件下稳定的电子顺磁共振沉默Fe 2+掺杂剂。这些胶体纳米碳提供了一个潜在的构建块操纵磁光特性和等离子体响应的胶体纳米碳和更高阶的纳米结构。
The synthesis of Al and Fe codoped ZnO colloidal nanocrystals (NCs) using a modified etching-regrowth-doping method is presented. We show that the spectroscopic signatures associated with Fe3+ in ZnO disappear upon introduction of Al3+ donor defects into the ZnO lattice. The presence of Al3+ is confirmed by the appearance of a localized surface plasmon resonance feature indicating excess free carriers in the codoped NCs. These spectral changes suggest that Al3+ doping results in a reduction of Fe3+ dopants to the electron paramagnetic resonance-silent Fe2+ dopants that are stable under ambient conditions. These colloidal NCs provide a potential building block for manipulating magneto-optical properties and plasmon responses in colloidal NCs and higher-order nanostructures.