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Chinese Physics, 2001, Vol. 10(3): 218-222    DOI: 10.1088/1009-1963/10/3/309
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

SELF-ORGANIZED FORMATION OF HEXAGONAL NANOPORE ARRAYS IN ANODIC ALUMINA

Zhou Wei-ya (周维亚), Li Yu-bao (李玉宝), Liu Zu-qin (刘祖琴), Tang Dong-sheng (唐东升), Zou Xiao-ping (邹小平), Wang Gang (王刚)
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract  Conditions for a self-organized formation of ordered hexagonal structure in anodic alumina were investigated, using oxalic or sulphuric acid as an electrolyte. Highly-ordered nanopore arrays with pore densities of 9×109-6.5×1010cm-2 and high aspect ratios over 3000 were fabricated by a two-step anodization process. The array exhibits characteristics analogous to a two-dimensional polycrystalline structure of a few micrometres in size. The interpore distance can be controlled by changing the electrolyte and/or the applied voltage. The formation mechanism of ordered arrays is consistent with a previously proposed mechanical stress model, i.e., the repulsive forces between neighbouring pores at the metal/oxide interface promote the formation of hexagonally ordered pores during the oxidation process.
Keywords:  anodic alumina      nanochannel array      self-organization      porous film  
Received:  30 September 2000      Accepted manuscript online: 
PACS:  61.43.Gt (Powders, porous materials)  
  81.05.Rm (Porous materials; granular materials)  
  82.45.Yz (Nanostructured materials in electrochemistry)  
  82.45.Gj (Electrolytes)  
  81.16.Rf (Micro- and nanoscale pattern formation)  
Fund: Project supported in part by the National Natural Science Foundation of China (Grant No.59772026).

Cite this article: 

Zhou Wei-ya (周维亚), Li Yu-bao (李玉宝), Liu Zu-qin (刘祖琴), Tang Dong-sheng (唐东升), Zou Xiao-ping (邹小平), Wang Gang (王刚) SELF-ORGANIZED FORMATION OF HEXAGONAL NANOPORE ARRAYS IN ANODIC ALUMINA 2001 Chinese Physics 10 218

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