Rapid and High-Efficiency Laser-Alloying Formation of ZnMgO Nanocrystals.
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.
Institute of Optoelectronics &Nanomaterials, Jiangsu Key Laboratory of Advanced Micro &Nano Materials and Technology, College of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.|Jiangsu Key Laboratory of ASCI Design, College of Electronics and Information, Nantong University, Nantong 226019, China.
Peisheng
P
Liu
Institute of Optoelectronics &Nanomaterials, Jiangsu Key Laboratory of Advanced Micro &Nano Materials and Technology, College of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.|Jiangsu Key Laboratory of ASCI Design, College of Electronics and Information, Nantong University, Nantong 226019, China.|College of Science, Nantong University, Nantong 226019, China.
Hao
H
Wang
Institute of Optoelectronics &Nanomaterials, Jiangsu Key Laboratory of Advanced Micro &Nano Materials and Technology, College of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Jun
J
Chen
Institute of Optoelectronics &Nanomaterials, Jiangsu Key Laboratory of Advanced Micro &Nano Materials and Technology, College of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Xiaoming
X
Li
Institute of Optoelectronics &Nanomaterials, Jiangsu Key Laboratory of Advanced Micro &Nano Materials and Technology, College of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Haibo
H
Zeng