Experimental Conditions On The Hydrothermal Synthesis Of Mn-doped Zno Powder Structure And Morphology Of Impact

Traditional semiconductors use of the electronic properties of charge for information processing and communications, and Magnetic materials use of the Spin properties of charge for Storing information, Such as Hard drive,Disk. If the electronic charge and spin properties of these two are centralized controled in a single materials, it will be a new device-the spin electronic devices. At present, the research has made great progress, However, the difficulties faced is how to raise the Curie temperature of material above room temperature, Otherwise it is very difficult to achieve the application. To resolve this problem, the fundamental way is to continuously improve the experimental methods,optimize the preparation process, and control of synthesis conditions, understand experimental conditions impaction on Micro-structure and macro-morphology and analysis of the growth mechanism, eventually so as to synthesize doped samples even lay the foundation.In this paper, orthogonal experimental is designed by hydrothermal method, The main objective is to study and explore the different experimental conditions impaction on Micro-structure and macro-morphology of crystal structure of Mn-doped ZnO,and explore and explain the growth mechanism of different morphologies in different experimental conditions, final ,on the basis of the factors impact on crystal structure and morphology of Mn-doped ZnO. Through designing the experiment with different doping concentration of Zn_1-xMn_xO (X followed 0at%, 5at%, 10at%, 15at%), and then studies the different doping concentration impact on crystal structure and morphology of ZnO powder.(一) With zinc acetate,manganese acetate, sodium hydroxide as the main raw material, through designing four factors and three levels of the orthogonal experiment, Zn_0.85Mn_0.15O powder is synthesised. According to orthogonal experiment data, a visual analysis of maps is made , the factors that affect the experimental response is followed concentration of precursor solutionâ†'pHâ†'temperatureâ†'time by the orthogonal experiment table and a visual analysis of maps, at the same time, the best combination of experimental conditions are obtained. Finally, Continue to do additional experiments at the near the best combination of the experiment, and reached the best point of the experiment: 0.1 mol / L, pH = 14,180℃, 14h.(二) On the basis of best point of the experimental conditions,the experiments for Zn_0.85Mn_0.15O powder are designed in different experimental conditions, such as different concentrations of precursor solution,different pH,different temperatures, different time, and produce different morphology of the powder samples, such as Nanorods, Needle stick,Nanowires,Thin hexagonal, Particles. Using X-ray diffraction pattern and environmental scanning electron microscopy (SEM) photos, from the micro and macro aspects of two analysis different experimental conditions impaction on Micro-structure and macro-morphology of crystal structure of Zn_0.85Mn_0.15O powder,At the same time, according to growth model(such as [Zn(OH)₄]^2-) of anion coordination polyhedron, Preliminary study and explain the relationship between the experimental conditions and the nucleation rate of crystal,growth direction of crystal,growth patterns of crystal, That is caused by the growth mechanism of different morphologies. Finally, according to experimental conclusions, a visual analysis of maps is made between different precursor solution concentration,different pH,different temperatures,different time and Growth morphology of Zn_0.85Mn_0.15O powder iin hydrothermal conditions.(三) On the basis of studying experimental conditions impact on structure and morphology of Mn-doped ZnO powder, designing the experiment with different doping concentration of Zn_1-xMn_xO (X followed 0at%, 5at%, 10at%, 15at%). Seen from X-ray diffraction pattern, the diffraction peaks basically maintain a pure ZnO wurtzite structure. With the improvement of doping concentration,the relative intensity of diffraction peak gradually weaken, and there is a miscellaneous of ZnMn2 +3 O4, it is a spinel material, at present, literatures have not reported. The data tested by JADE, made the relationship between lattice constant and doping concentration, it shows that Mn²⁺ has a very good access into the ZnO crystal lattice. At the same time, the scanning electron microscope photographs (SEM) of different doping concentration of samples tested, with the doping concentration increase, the average size of grain gradually reduce, and morphology of Grain all are hexagonal granular, Moreover lts edge are very obvious, therefore different doping concentration have an important impact on structure and morphology of crystal.