Study On The Hydrothermal Synthesis And The Optical And Magnetic Propetries Of Mn-doped And Co-doped Nano ZnO

Briefly introduce the basic knowledge of nanometer materials, the properties ofthe zinc oxide, the research progress of nanometer ZnO, and preparation methods ofnanometer ZnO. The Preparation methods of the experiments are hydrothermalsynthesis. The experiments are made up of4parts. In the first part, the reactionreagent is NaOH and Zinc acetate. Experimental constraints are the temperature andconcentration two aspects. Characterization methods of the samples are XRD, PL andSEM. Through the characterization results of the samples to explore the two factorsinfluence law on the crystal growth and the best growth conditions. In the second part,the reaction reagents respectively are NaOH, Zinc acetate and Methenamine, Zincacetate. Do contrast test on ITO glass and silicon substrate. From the four aspects:thetemperature, reagents, reagent substrate concentration, constraints on experimentalconditions. Use XRD and SEM to characterize the samples. Through analysis thecharacterization results of the samples to explore the four factors influence law on thecrystal growth and the best growth conditions. In the third part, the reaction reagentsrespectively are NaOH, Zinc acetate and Methenamine, Zinc acetate. Do Mn-dopedand Co-doped experiment on ITO glass substrates. In the forth part, the experimentsare Mn-doped and Co-doped experiment. The reaction reagents are Zinc acetate andMethenamine. Samples are powder. The main conclusions are as follows:(1) In the condition that: the reaction reagents are Zinc acetate and NaOH, Themole ratio is1:1, the Zinc acetate concentration is0.1mol/l,0.5mol/l,1mol/l; crystalgrowth direction has no significant association with the temperature and concentration.The results of the PL characteristics of the samples show that: the quality and theluminous efficiency of the samples made by0.5mol/l Zinc acetate has no obviousregularity when the temperature between100℃and250℃. The quality of the samplesmade by0.1mol/l Zinc acetate shows downward trends with temperature increasingwhen temperature is between100℃and150℃. But when the temperature isbetween150℃and200℃, it shows upward trend with the temperature increasing.When the temperature is between200℃and250℃, it keeps high quality. Under thesame conditions, samples made by lower concentration reaction reign have higherquality and luminous efficiency. All the samples irregular in shape and themorphology of the samples are relatively poor.Hydrothermal experiments with Teflon lined autoclave the heating temperatureshould not be exceed225Celsius degrees.(2) In the condition that: the reaction reagents are Zinc acetate and NaOH, themole ratio is2:1, heating time is4hours, Zinc oxide crystals which are wellorientation and dominant growth are get along with (100) surface can be get on bothITO glass and silicon substrates. The chance can get Zinc oxide crystals on ITO glasssubstrates is77.8%while on silicon substrates is44.4%. ITO glass substrates aresuperior than silicon substrates. In the condition that the reaction reagents are Zincacetate and Methenamine, the mole ratio is1:1, heating time is4hours, products ofthe lower concentration of reactants dominant growth are get along with (100) surface while the higher concentration of reactants dominant growth are get along with (200)surface. The chance can get Zinc oxide crystals on ITO glass substrates is55.6%, onsilicon substrates is66.7%. The difference is not very obvious, and the probability ofsuccess of the two methods is relative high.No samples with good morphology are obtained on the two kinds of substratesthrough the two kinds methods.(3) The chance of the Mn-doped and Co-doped experiments that can get Zincoxide crystals on ITO glass substrates is only10.5%, when the reaction reagents areNaOH and Zinc acetate. When the reaction reagents are Methenamine and Zincacetate, the chance is100%. The both two kinds samples’ dominant growth are getalong with (100) surface.(4) All the selected test samples have weak room temperature magnetic.