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

Li Rong Zhao; Jian Wang; Yan Li; Cheng Wei Wang; Feng Zhou; Wei Min Liu

doi:10.1016/j.physb.2009.08.306

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

Li Rong Zhao, Jian Wang, Yan Li, Cheng Wei Wang, Feng Zhou, Wei Min Liu

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Porous anodic aluminum oxide (AAO) films were fabricated electrochemically in the mixed electrolytes with various volume ratios of 0.3 M C₂H₂O₄ and 0.3 M 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.

Original language	English
Pages (from-to)	456-460
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	405
Issue number	1
DOIs	https://doi.org/10.1016/j.physb.2009.08.306
State	Published - 1 Jan 2010
Externally published	Yes

Keywords

AAO films
Mixture electrolytes
Optical constants

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10.1016/j.physb.2009.08.306

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

abstract = "Porous anodic aluminum oxide (AAO) films were fabricated electrochemically in the mixed electrolytes with various volume ratios of 0.3 M C2H2O4 and 0.3 M 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.",

keywords = "AAO films, Mixture electrolytes, Optical constants",

author = "Zhao, {Li Rong} and Jian Wang and Yan Li and Wang, {Cheng Wei} and Feng Zhou and Liu, {Wei Min}",

year = "2010",

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doi = "10.1016/j.physb.2009.08.306",

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T1 - Anodic aluminum oxide films formed in mixed electrolytes of oxalic and sulfuric acid and their optical constants

AU - Zhao, Li Rong

AU - Wang, Jian

AU - Li, Yan

AU - Wang, Cheng Wei

AU - Zhou, Feng

AU - Liu, Wei Min

PY - 2010/1/1

Y1 - 2010/1/1

N2 - Porous anodic aluminum oxide (AAO) films were fabricated electrochemically in the mixed electrolytes with various volume ratios of 0.3 M C2H2O4 and 0.3 M 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.

AB - Porous anodic aluminum oxide (AAO) films were fabricated electrochemically in the mixed electrolytes with various volume ratios of 0.3 M C2H2O4 and 0.3 M 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.

KW - AAO films

KW - Mixture electrolytes

KW - Optical constants

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DO - 10.1016/j.physb.2009.08.306

M3 - 文章

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JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1

ER -

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

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Keywords

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