OSA's Digital Library

Journal of Display Technology

Journal of Display Technology


  • Vol. 5, Iss. 9 — Sep. 1, 2009
  • pp: 350–354

Strong Vertical Alignment of Liquid Crystal on Porous Anodic Aluminum Oxide Film

Tsung-Ta Tang, Cheng-Ying Kuo, Ru-Pin Pan, Jia-Min Shieh, and Ci-Ling Pan

Journal of Display Technology, Vol. 5, Issue 9, pp. 350-354 (2009)

View Full Text Article

Acrobat PDF (1990 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

  • Export Citation/Save Click for help


Properties of anodic aluminum oxide (AAO) film as a liquid crystal (LC) alignment material is studied. We deposit the transparent porous AAO film on glass with the diameter of the pores controlled between 17–65 nm. The liquid crystal can be aligned vertically against the substrate with the AAO film. The measured polar anchoring strength is about 1.5$\,\times 10 ^{-5} {\rm J/m} ^{2}$, which is comparable to that of N,N-dimethyl-N-octadecyl-3-aminopropyl -trimethoxysilyl chloride (DMOAP) layer. AAO films with smaller pore diameters exhibit higher anchoring strengths. On the other hand, the uniformity of the pore array in the AAO films does not affect the alignment quality significantly.

© 2009 IEEE

Tsung-Ta Tang, Cheng-Ying Kuo, Ru-Pin Pan, Jia-Min Shieh, and Ci-Ling Pan, "Strong Vertical Alignment of Liquid Crystal on Porous Anodic Aluminum Oxide Film," J. Display Technol. 5, 350-354 (2009)

Sort:  Year  |  Journal  |  Reset


  1. M. Nakamura, "Surface topography and alignment of liquid crystals on rubbed oxide surfaces," J. Appl. Phys. 52, 4561-4567 (1981).
  2. P. Chaudhari, J. Lacey, J. Doyle, E. Galligan, S. C. A. Lien, A. Callegari, G. Hougham, N. D. Lang, P. S. Andry, R. John, K. H. Yang, M. Lu, C. Cai, J. Speidell, S. Purushothaman, J. Ritsko, M. Samant, J. Stöhr, Y. Nakagawa, Y. Katoh, Y. Saitoh, K. Sakai, H. Satoh, S. Odahara, H. Nakano, J. Nakagaki, Y. Shiota, "Atomic-beam alignment of inorganic materials for liquid-crystal displays," Nature 411, 56-59 (2001).
  3. H. Y. Wu, T. T. Tang, C. C. Wang, R. P. Pan, S. J. Chang, J. C. Hwang, "Controllable alignment modes of nematic liquid crystals on argon ion beam bombarded polyimide films," Mol. Cryst. Liq. Cryst. 475, 45-55 (2007).
  4. R. P. Pan, H. Y. Chiu, Y. F. Lin, J. Y. Huang, "Surface topography and alignment effects in UV-modified polyimide films with mcron size patterns," Chinese J. Phys. 41, 177-184 (2003).
  5. O. Yaroshchuk, L. G. Cada, M. Sonpatki, L.-C. Chien, "Liquid-crystal photoalignment using low-molecular-weight photo-cross-linkable composites," Appl. Phys. Lett. 79, 30-32 (2001).
  6. D. W. Berreman, "Solid surface shape and the alignment of an adjacent nematic liquid crystal," Phys. Rev. Lett. 28, 1683-1686 (1972).
  7. S. Faetti, "Azimuthal anchoring energy of a nematic liquid crystal at a grooved interface," Phys. Rev. A 36, 408-410 (1987).
  8. Y. F. Lin, S. Y. Lu, R. P. Pan, "Temperature dependence of azimuthal anchoring strength of liquid crystals on microgrooved glass substrate," Jpn. J. Appl. Phys. 44, 8552-8556 (2005).
  9. F. Lin, M. C. Tsou, R. P. Pan, "Alignment of liquid crystals by ion etched grooved glass surfaces," Chinese J. Phys. 43, 1066-1073 (2005).
  10. S. Faetti, M. Gatti, V. Palleschi, T. J. Sluckin, "Almost critical behavior of the anchoring energy at the interface between a nematic liquid crystal and a SiO substrate," Phys. Rev. Lett. 55, 1681-1684 (1985).
  11. H. Yokoyama, S. Kobayashi, H. Kamei, "Temperature dependence of the anchoring strength at a nematic liquid crystal-evaporated sio interface," J. Appl. Phys. 61, 4501-4518 (1987).
  12. J. L. Janning, "Thin film surface orientation for liquid crystals," Appl. Phys. Lett. 21, 173-174 (1972).
  13. C. R. Martin, "Membrane-based synthesis of nanomaterials," Chem. Mater. 8, 1739-1746 (1996).
  14. R. A. Caruso, M. Antonietti, "Sol-gel nanocoating: An approach to the preparation of structured materials," Chem. Mater. 13, 3272-3282 (2001).
  15. F. Keller, M. S. Hunter, D. L. Robinson, "Structural features of oxide coatings on aluminum," J. Electrochem. Soc. 100, 411-419 (1953).
  16. O. Jessensky, F. Müller, U. Gösele, "Self-organized formation of hexagonal pore arrays in anodic alumina," Appl. Phys. Lett. 72, 1173-1175 (1998).
  17. A. P. Li, F. Müller, A. Bimer, K. Nielsch, U. Gösele, "Hexagonal pore arrays with a 50–420 nm interpore distance formed by self-organization in anodic alumina," J. Appl. Phys. 84, 6023-6026 (1998).
  18. A. P. Li, F. Müller, A. Bimer, K. Nielsch, U. Gösele, "Polycrystalline nanopore arrays with hexagonal ordering on aluminum," J. Vac. Sci. Technol. A 17, 1428-1431 (1999).
  19. T. Kyotani, L. F. Tsai, A. Tomita, "Preparation of ultrafine carbon tubes in nanochannels of an anodic aluminum oxide film," Chem. Mater. 8, 2109-2113 (1996).
  20. D. Routkevitch, T. Bigioni, M. Moskovits, J. M. Xu, "Electrochemical fabrication of CdS nanowire arrays in porous anodic aluminum oxide templates," J. Phys. Chem. 100, 14037-14047 (1996).
  21. D. Al-Mawlawi, C. Z. Liu, M. Moskovits, "Nanowires formed in anodic oxide nanotemplates," J. Mater. Res. 9, 1014-1018 (1994).
  22. T. Maeda, K. Hiroshima, "Vertically aligned nematic liquid crystal on anodic porous alumina," Jpn. J. Appl. Phys. 43, L1004-L1006 (2004).
  23. T. Maeda, K. Hiroshima, "Tilted liquid crystal alignment on asymmertrically grooved porous alumina film," Jpn. J. Appl. Phys. 44, L845-L847 (2005).
  24. H. Masuda, M. Satoh, "Fabrication of gold nanodot array using anodic porous alumina as an evaporation mask," Jpn. J. Appl. Phys. 35, L126-L129 (1996).
  25. T. J. Scheffer, J. Nehring, "Accurate determination of liquid-crystal tilt bias angles," J. Appl. Phys. 48, 1783-1792 (1977).
  26. K. H. Yang, C. Rosenblatt, "Determination of the anisotropic potential at the nematic liquid crystal-to-wall interface," Appl. Phys. Lett. 43, 62-64 (1983).

Cited By

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited