| Low-dimension ZnO nanowire(NW) arrays have many unique properties. Recently,these ZnO semiconductor materials show extensive application in the electronic and opticsdevice fields. As a result, they have aroused the researchers'interest and many attentions. Sopreparing and studying the properties of the low-dimension ZnO nanowire semiconductormaterials has been the hot point in today's nanometer material science and condensed matterphysics.In order to develop application researching for the low-dimension ZnO semiconductormaterials in the electronics, optical, piezoelectric, sensor device fields, the researchingfor thesynthesis method of the low-dimension ZnO nanowire arrays become very important. Andexploring the optimal preparation process and influence factors for the synthesis of thelow-dimension ZnO nanowire arrays have been the most pressing problem in nanometermaterialscienceandcondensedmatterphysics.Forfindingtheoptimal preparationprocess inthesynthesis ofthealignedZnOnanowirearrays via hydrothermal method, we studied various process conditions and fabricatinginfluences.Thisthesishasresearchedtheworksasbelow:1.One-dimensionalalignedZnONWarraysweredirectlypreparedonzincfoilsubstratesreacting in aqueous ammonia. During the experimental processes, the influence of solutionconcentration on the microstructure of ZnO NW arrays has been studied. We first controlledthereactiontemperature in95℃,the reactiontimewas set for12 hunder theconditionof theammonia concentration (volume ratio) for 4%, 7%, 10% and 15%, respectively. The TEM,XRD and PL spectrum of the synthesized one-dimensional aligned ZnO NW arrays wereanalyzedandcompared.As the aqua ammonia reaction solution, we used the Zn chip to prepare theone-dimensionalnanometerZnOnanoarraysbythenormalHydrothermalSynthesistechnique.In order to research the aqua ammonia concentration to the morphology influence of growthZnOnanowirearrays,wefirstcontrolledthereactiontemperaturein95.2. The reaction time on influence the morphologyof orientation of ZnO nanowire arrayshavebeenstudied.Reactiontemperaturecontrolin95℃,ammoniaconcentrationas10%,putthe four reaction kettle with containing same reactant into containers and heating. Research the microstructure of the preparation of samples which were respectively grown 12, 24, 36and48hours.UseSEManalysedandcomparedresults.3.ResearchtheammoniasolutionhydrothermalsynthesisprocessofreactiontemperatureeffectonorientationofZnOnanowirearrays. Inthisexperiment,Ammoniaconcentrationwascontroled in 10%, reaction time for 12 hours and reaction temperature respectively controledfor 95℃, 125℃and 145℃. Repeated this experiment several times, characterized SEMphotosofdifferentsamplesandanalysedtheresultsandcomparedthem.Under the condition of different ammonia concentration of the preparation of orientationZnOnanowirearrays samples tolight shine(PL) properties research.And withthePLspectraof ZnO nanowire arrays which were prepation by CVD method are compared. The resultsfound that for reaction environment airtigh, the selected reactant approximate to pure content.By hydrothermal synthesis method on the metal Zn piece preparation of orientation of ZnOnanowire arrays, the possibility of impurities introducing greatly reduce, single nanowires insynthetic orientation of ZnO nanowire arrays samples has little impurity level, its PL in asuperb among single-peak characteristics, PL spectrum only has single purple glow peakwhichwas producedbyelectronic-cavitiesformedexcitonscompositeluminescence,didnotappear green peaks which were produced by impurity and defects in ZnO nanowire arrayssample that it was prepared by CVD method. This paper also analyzed PL mechanism aboutorientation of ZnO nanowire arrays sample and PLspectrum characteristics of ZnO nanowirearrayssampleswhicarerespectivelypreparedbyhydrothermalsynthesisandCVDmethod.Research also shows, the preparation of ZnO nanowire arrays samples by hydrothermalsynthesis, with the increase of ammonia concentration, he diameter of preparation ofnanometer line sample then smaller, and its ultraviolet wavelength of PL spectral radiationgradually move to blue. This phenomenon is very apparent in experiments. The results alsoconfirmedthesmallsizeeffectofnanometermaterial. |
