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Anodic aluminum oxide films formed in mixed electrolytes of oxalic and sulfuric acid and their optical constants

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Title: Anodic aluminum oxide films formed in mixed electrolytes of oxalic and sulfuric acid and their optical constants
Authors: Zhao, Li-Rong1, Wang, Jian1, Li, Yan1, Wang, Cheng-Wei1,2,3 cwwang@nwnu.edu.cn, Zhou, Feng2, Liu, Wei-Min2
Source: Physica B. Jan2010, Vol. 405 Issue 1, p456-460. 5p.
Subjects: Aluminum oxide, Thin films, Electrolytes, Oxalic acid, Sulfuric acid, Optical constants, Porous materials, Microfabrication, Electrochemical analysis
Abstract: Abstract: Porous anodic aluminum oxide (AAO) films were fabricated electrochemically in the mixed electrolytes with various volume ratios of 0.3M C2H2O4 and 0.3M H2SO4. The transmission spectra with the interference fringes were measured and the modified Swanepoel method was used to determine the optical constants of the free standing AAO films. The calculated thickness agrees well with the measured thickness from the FE-SEM images of the cross section, which indicates that the modified Swanepoel method is very fit for the determination of the optical constants of the free standing AAO films. Meantime, with the decrease of the volume ratio of C2H2O4 and H2SO4, the refractive index and thickness of AAO films increase, but the extinction coefficient decreases. The optical band gap is appropriately fitted to the direct transition model proposed by Tauc in the strong-absorption region of investigated films, and is derived from Tauc''s extrapolation. The reasons were investigated. [Copyright &y& Elsevier]
Copyright of Physica B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 45555547
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Items – Name: Title
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  Data: Anodic aluminum oxide films formed in mixed electrolytes of oxalic and sulfuric acid and their optical constants
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  Data: <searchLink fieldCode="AR" term="%22Zhao%2C+Li-Rong%22">Zhao, Li-Rong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Jian%22">Wang, Jian</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Yan%22">Li, Yan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Cheng-Wei%22">Wang, Cheng-Wei</searchLink><relatesTo>1,2,3</relatesTo><i> cwwang@nwnu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhou%2C+Feng%22">Zhou, Feng</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+Wei-Min%22">Liu, Wei-Min</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Physica+B%22">Physica B</searchLink>. Jan2010, Vol. 405 Issue 1, p456-460. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Aluminum+oxide%22">Aluminum oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolytes%22">Electrolytes</searchLink><br /><searchLink fieldCode="DE" term="%22Oxalic+acid%22">Oxalic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Sulfuric+acid%22">Sulfuric acid</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+constants%22">Optical constants</searchLink><br /><searchLink fieldCode="DE" term="%22Porous+materials%22">Porous materials</searchLink><br /><searchLink fieldCode="DE" term="%22Microfabrication%22">Microfabrication</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+analysis%22">Electrochemical analysis</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: Porous anodic aluminum oxide (AAO) films were fabricated electrochemically in the mixed electrolytes with various volume ratios of 0.3M C2H2O4 and 0.3M H2SO4. The transmission spectra with the interference fringes were measured and the modified Swanepoel method was used to determine the optical constants of the free standing AAO films. The calculated thickness agrees well with the measured thickness from the FE-SEM images of the cross section, which indicates that the modified Swanepoel method is very fit for the determination of the optical constants of the free standing AAO films. Meantime, with the decrease of the volume ratio of C2H2O4 and H2SO4, the refractive index and thickness of AAO films increase, but the extinction coefficient decreases. The optical band gap is appropriately fitted to the direct transition model proposed by Tauc in the strong-absorption region of investigated films, and is derived from Tauc''s extrapolation. The reasons were investigated. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Physica B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.physb.2009.08.306
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 5
        StartPage: 456
    Subjects:
      – SubjectFull: Aluminum oxide
        Type: general
      – SubjectFull: Thin films
        Type: general
      – SubjectFull: Electrolytes
        Type: general
      – SubjectFull: Oxalic acid
        Type: general
      – SubjectFull: Sulfuric acid
        Type: general
      – SubjectFull: Optical constants
        Type: general
      – SubjectFull: Porous materials
        Type: general
      – SubjectFull: Microfabrication
        Type: general
      – SubjectFull: Electrochemical analysis
        Type: general
    Titles:
      – TitleFull: Anodic aluminum oxide films formed in mixed electrolytes of oxalic and sulfuric acid and their optical constants
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            NameFull: Zhao, Li-Rong
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            NameFull: Wang, Jian
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            NameFull: Li, Yan
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            NameFull: Wang, Cheng-Wei
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            NameFull: Zhou, Feng
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              M: 01
              Text: Jan2010
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              Y: 2010
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              Value: 405
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