Preparation and characterization of titania thin films from aqueous solutions
Dip- or spin-coating and characterization of titania (TiO2) thin films from various aqueous solutions have been studied. The aqueous titanium solutions mainly used in this study were halogen- and chelate-free solutions with the concentrations up to 1.4 M derived from titanium isopropoxide (TIP) with...
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Published in | Journal of sol-gel science and technology Vol. 26; no. 1-3; pp. 799 - 802 |
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Main Authors | , , , , , |
Format | Conference Proceeding Journal Article |
Language | English |
Published |
Heidelberg
Springer
2003
Springer Nature B.V |
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Abstract | Dip- or spin-coating and characterization of titania (TiO2) thin films from various aqueous solutions have been studied. The aqueous titanium solutions mainly used in this study were halogen- and chelate-free solutions with the concentrations up to 1.4 M derived from titanium isopropoxide (TIP) with tetramethylammonium hydroxide (TMAOH) or some alkylamines, while aqueous and alcoholic solutions containing titanium atoms stabilized chelating ligands were examined for comparison. The TiO2 films prepared from the TIP-TMAOH solution were already crystallized at 350°C to anatase form and those formed at 600°C had high transparency and refractive indices of 2.40. No carbon residue in the film prepared at 400°C was detected by XPS. The pure anatase form was sustained up to 850°C. Interestingly, it was found that the (004) preferentially oriented anatase films were obtained from TIP-lactic acid (LA) system until 700°C. The solutions containing citric acid (CA) or alkanolamines yielded anatase and rutile form fired at the temperatures equal to or higher than 600°C. Carbon residue was detected in the film fired at 400°C. The film thickness monotonically decreased from the upper to the bottom ends of the substrate. However, it was found that the thickness uniformity was drastically improved by an addition of sucrose to the aqueous solutions. The effects of the solution composition and polyhydroxy compounds on the crystal modifications of formed films and the film uniformity are discussed. |
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AbstractList | Dip- or spin-coating and characterization of titania (TiO2) thin films from various aqueous solutions have been studied. The aqueous titanium solutions mainly used in this study were halogen- and chelate-free solutions with the concentrations up to 1.4 M derived from titanium isopropoxide (TIP) with tetramethylammonium hydroxide (TMAOH) or some alkylamines, while aqueous and alcoholic solutions containing titanium atoms stabilized chelating ligands were examined for comparison. The TiO2 films prepared from the TIP-TMAOH solution were already crystallized at 350°C to anatase form and those formed at 600°C had high transparency and refractive indices of 2.40. No carbon residue in the film prepared at 400°C was detected by XPS. The pure anatase form was sustained up to 850°C. Interestingly, it was found that the (004) preferentially oriented anatase films were obtained from TIP-lactic acid (LA) system until 700°C. The solutions containing citric acid (CA) or alkanolamines yielded anatase and rutile form fired at the temperatures equal to or higher than 600°C. Carbon residue was detected in the film fired at 400°C. The film thickness monotonically decreased from the upper to the bottom ends of the substrate. However, it was found that the thickness uniformity was drastically improved by an addition of sucrose to the aqueous solutions. The effects of the solution composition and polyhydroxy compounds on the crystal modifications of formed films and the film uniformity are discussed. |
Author | SHIBATA, Yukio OHYA, Tomokazu OHYA, Yutaka BAN, Takayuki NAKAYAMA, Aki TAKAHASHI, Yasutaka |
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Keywords | polyhydroxy compounds Transition metal Compounds Experimental study sucrose aqueous titanate solution Thin film Quaternary ammonium compound Structure processing relationship Stabilizer agent dip-coated TiO2 thin films Preparation Titanium compound precursor chemistry Dip coating Alcoholic solution Aqueous solution Titanium oxide Crystalline structure |
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Snippet | Dip- or spin-coating and characterization of titania (TiO2) thin films from various aqueous solutions have been studied. The aqueous titanium solutions mainly... |
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SubjectTerms | Alkanolamines Alkylamines Anatase Aqueous solutions Carbon Chelates Chelation Chemistry Citric acid Crystallization Elements and non-metal compounds (oxides, hydroxides, hydrides, sulfides, carbides, ...) Exact sciences and technology Film thickness Immersion coating Inorganic chemistry and origins of life Lactic acid Preparations and properties Refractivity Spin coating Substrates Sucrose Thin films Titanium Titanium dioxide |
Title | Preparation and characterization of titania thin films from aqueous solutions |
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