| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Effects of Grain Orientation and Oxidation Voltage on Morphology of Anodized Ta2O5 Nanotubes |
| ZHANG Yu1, LIU Shifeng1, LI Lijuan1, ZHU Jialin1, DENG Chao1,2
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1 College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2 Electron Microscopy Center of Chongqing University, Chongqing 400044, China |
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Abstract Ta2O5 nanotubes were prepared by single crystals with different orientation, including (110) and (111), anodizing at constant voltage 30 V for 1 min in a concentrated H2SO4/HF solution with a volume ratio of 9∶1. The effect of grain orientations on the morphology of anodized Ta2O5 nanotubes was investigated by comparing the SEM images of Ta2O5 nanotubes grown on single crystals with different grain orientation. At the same electrolyte system, the effect of oxidation potentials on the morphology of Ta2O5 nanotubes was investigated by oxidizing for 30 s under the voltage of 5 V, 15 V, 25 V, and 35 V, respectively. The results showed that the (111) orientation was more favorable for the growth of Ta2O5 nanotubes, which led to a structure with 6.28 μm in thickness with the clustered Ta2O5 nanotubes at top and a rough outside wall, similar to bamboo, however the Ta2O5 nanotubes prepared by (110) orientation had good openings and smooth outer wall, and the tube length was about 3.71 μm. The study also found that the tube length and diameter of Ta2O5 nanotubes are positively correlated with the oxidation voltage, moreover the length and diameter of Ta2O5 nanotubes grown by (111) single crystals were better than those of (110) single crystals. Growth rate of Ta2O5 nanotubes was related to grain orientation. The difference in the length and diameter of Ta2O5 nanotubes prepared by different orientation single crystals was mainly due to the atomic planar density, the higher the atomic planar density, the smaller the growth rate of the nanotubes and the shorter the Ta2O5 nanotubes length, the smaller the Ta2O5 nanotubes diameter.
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Published: 25 April 2020
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| Fund:This work was financially supported by Chongqing Basic Science and Frontier Technology Research Project (cstc2017jcyjAX0094), National Science and Technology Major Project (2011ZX02705) |
About author:: Yu Zhangis a postgraduate at the College of Materials Science and Engineering in Chongqing University.Her research focuses on the preparation of Ta2O5 nanotubes by anodization and the thermal behavior of Ta2O5 nanotubes during annealing.
Shifeng Liuobtained his Ph.D from the Shanghai Institute of Ceramics of the Chinese Academy of Sciences and served in College of Materials Science and Engineering, Chongqing University till now. He is currently a professor and doctoral supervisor. He has published more than 50 journal papers. His team’s research interests are microstructure and texture optimization of sputtering targets for integrated circuit manufacturing, deformation mechanism and texture research of hexago-nal structure metals and alloys, advanced material preparation and processing technology. He is responsible for the completion of a number of scientific research projects, including National Science and Technology Major Project, National Natural Science Foundation of China Youth Fund Project and so on. |
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2020, Vol. 34 
