Rapid and High-Efficiency Laser-Alloying Formation of ZnMgO Nanocrystals.
Rapid and High-Efficiency Laser-Alloying Formation of ZnMgO Nanocrystals.
复制标题
快速高效激光合金化 ZnMgO 纳米晶体
DOI：
10.1038/srep28131
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发表时间：
2016-06-21
影响因子：
4.6
通讯作者：
Zeng H
中科院分区：
文献类型：
--
作者：
Liu P;Wang H;Chen J;Li X;Zeng H
ZnMgO纳米晶的应用，特别是在光电探测器中的应用，由于合成过程中未解决的相分离而具有显著的限制。在这里，我们提出了一种快速，高效的ZnMgO NC合金化方法的基础上脉冲激光烧蚀在液体中。均匀镁（Mg）的极限值从37%提高到62%，光学带隙增加到3.7eV，具有高掺杂效率（>100%）。对ZnMgO纳米晶晶格结构的进一步研究表明，ZnMgO纳米晶均为六方纤锌矿结构，且随着Mg掺杂量的增加，（002）和（100）衍射峰向高衍射角方向移动。根据布喇格定律和晶格几何方程计算的晶格常数a和c略有下降。此外，退火温度与均匀镁的极限值之间的关系进行了检查，结果表明，后者与前者减少，因为MgO的相分离。介绍了锌镁合金激光合金化的可能机理，详细阐述了激光合金化过程。
Applications of ZnMgO nanocrystals (NCs), especially in photoelectric detectors, have significant limitations because of the unresolved phase separation in the synthesis process. Here, we propose a rapid and highly efficient ZnMgO NC alloying method based on pulsed laser ablation in liquid. The limit value of homogeneous magnesium (Mg) is pushed from 37% to 62% and the optical band gap is increased to 3.7 eV with high doping efficiency (>100%). Further investigations on the lattice geometry of ZnMgO NCs indicate that all ZnMgO NCs are hexagonal wurtzite structures and the (002) and (100) peaks shift to higher diffraction angles with the increase in Mg doping content. The calculated results of the lattice constants a and c slightly decrease based on Bragg’s law and lattice geometry equations. Furthermore, the relationship between annealing temperature and the limit value of homogeneous Mg is examined and the results reveal that the latter decreases with the former because of the phase separation of MgO. A probable mechanism of zinc magnesium alloy is introduced to expound on the details of the laser-alloying process.