Preparation And Doping Of Aluminum Oxide Nanoribbons

Aluminum oxide nanoceramic is a widely used ceramic material with excellent properties such as high hardness,large melting point,good corrosion resistance,good toughness,and good plasticity.Doping is an effective means to realize the functionalization of ceramic materials,which is helpful to broaden the application field of ceramic materials.The controllable doping of aluminum oxide nanoceramics is of great practical significance in the study of the functionalization of nanoceramics.In this study,vanadium was selected as the doping element,and vanadium ion doped boehmite nanoribbons were prepared by solvothermal method,and alumina nanoribbons were obtained by sintering.The element composition,structure,micromorphology,optical properties and electrochemical properties of the sample were studied.The main research results are as follows:（1）Boehmite（γ-AlOOH）nanoribbons and vanadium doped boehmite nanoribbons were prepared by solvothermal method.The actual concentration of vanadium incorporated into boehmite was obtained by EDS analysis.It was confirmed by powder X-ray diffraction that the sample was orthogonal structure of boehmite,and the change of crystal plane spacing after doping was analyzed.The addition of vanadium ion would not change the orthogonal structure of boehmite material,but would affect the crystal plane spacing of the material to a certain extent.The crystal plane spacing of Al_0.99V_0.01OOH is the smallest,which is smaller than that of undoped boehmite,with the increase of vanadium ion doping concentration,the crystal plane spacing shows an increasing trend.SEM and TEM analysis of the samples showed that the micromorphology of the prepared materials was nanoribbons.The length of nanoribbons was about 50～300 nm,the width was about 10～50 nm,and the thickness was about 2～10 nm.Among them,the microscopic size of Al_0.99V_0.01OOH nanoribbons was increased compared with that of undoped boehmite.However,with the increasing of vanadium ion doping concentration,the microscopic size of the nanoribbons decreases gradually,and curls will occur.The photoluminescence（PL）spectra of the sample were analyzed,and it was found that the addition of vanadium ions did not introduce new PL emission peaks,only the luminescence intensity of Al_0.99V_0.01OOH increased slightly,which may be related to the larger microscopic size of the material,more defects and anion vacancies.The electrochemical properties of the samples were analyzed,and it was found that Al_0.97V_0.03OOH nanoribbons had the largest specific capacitance,and the specific capacitance was higher than that of undoped boehmite nanoribbons,VOOH nanosheets and VOOH nanoparticles.Al_0.97V_0.03OOH had excellent electrochemical properties.（2）Alumina nanoribbons and vanadium ion doped alumina nanoribbons were obtained by sintering,and the actual concentration of vanadium element incorporated into alumina was obtained by EDS analysis.Powder X-ray diffraction confirmed that the sample wasγ-Al₂O₃with cubic structure,the spinel structure ofγ-Al₂O₃was not changed by the incorporation of vanadium ions.SEM and TEM analysis of the samples showed that the micromorphology of the material was still nanoribbons,but agglomeration of the nanoribbons occurred after sintering,and the degree of agglomeration of the nanoribbons may be related to the microscopic size.The PL spectra of the sample were analyzed,and it was found that the addition of vanadium ions did not introduce a new PL emission peak,and the PL peak position ofγ-Al₂O₃and vanadium ion-dopedγ-Al₂O₃was basically the same as that of boehmite,and no new emission peak was generated,but the peak intensity of the emission peak increased.The electrochemical properties of the samples were analyzed and it was found that the specific capacitance of Al_1.92V_0.08O₃was higher than that ofγ-Al₂O₃.In conclusion,this study confirmed that a small amount of vanadium ions doped will not change the crystal structure of boehmite andγ-Al₂O₃,and some laws of the influence of vanadium ion doping on the structure and properties of boehmite andγ-Al₂O₃are found.Vanadium ion doping does not significantly improve the PL properties of boehmite andγ-Al₂O₃powders.However,the electrochemical properties of boehmite nanoribbons have been significantly improved.