中介層Fe3O4及添加Fe(NO3)3．9H2O對IF鋼表面TiO2薄膜超親水性之影響

The Effects of Fe3O4 Interlayer and the Addition of Fe(NO3)3．9H2O on the Super-Hydrophilicity of TiO2 Thin Films on the Surface of IF Steel

朱緒遠(Hsu-Yuan Chu)

指導教授 ： 吳臺一

大同大學/工程學院/材料工程學系所/碩士(2008年)

摘要

本研究探討在IF鋼基材上藉由溶膠-凝膠法製備超親水性TiO2薄膜，由於Fe原子熱擴散之干擾，以致無法直接在基材IF鋼上利用溶膠-凝膠法獲得銳鈦礦相 (anatase) TiO2改質層，故利用硫酸水溶液先將基材表面氧化得到Fe3O4氧化層或利用乾式Al薄膜作為中介層，再於中介層上旋鍍TiO2前驅溶膠，最後在煅燒過程中利用中介層阻障基材Fe原子之熱擴散，成功地在IF鋼表面獲致銳鈦礦相TiO2改質層。本研究探討要項包括：(1) 比較濕式系統Fe/Fe3O4/TiO2與乾式系統Fe/Al/TiO2經後續不同熱處理製程對TiO2薄膜超親水性(super-hydrophilicity)之影響。(2) 改變基材後，在不同系統Fe/Al/TiO2、Si/Al/TiO2、Si/TiO2及Ti/TiO2之溶膠中添加少量之Fe(NO3)3．9H2O粉末，評估疊層TiO2薄膜之光催化特性。此研究經由掃描式電子顯微術 (scanning electron microscopy; SEM)、X光繞射術 (X-ray diffractometry; XRD)、拉曼散射光譜術 (Raman scattering spectroscopy)、輝光放電光譜術 (glow discharge optical spectrometry; GDOS)及紫外-可見光譜術 (ultraviolet-visible spectroscopy; UV-Vis) 等儀器來分析熱處理前後之表面形貌、結構、成分及特性變化情況。結果發現：(1) 濕式系統之Fe3O4中介層具有阻障基材Fe原子熱擴散之功效，以致Fe3O4/TiO2疊層薄膜呈現顯著之超親水特性。(2) 在Fe/Al/TiO2乾式系統中之TiO2前驅溶膠中添加少量Fe(NO3)3．9H2O粉末有助於降低TiO2 (3.26eV) 疊層鍍膜之能隙，使其吸收邊緣向藍光帶偏移。

關鍵字

IF鋼 ； Fe3O4/TiO2疊層鍍膜 ； 超親水性

並列摘要

The preparation of super-hydrophilicTiO2 thin film on IF (interstitial free) steel, silicon and titanium substrates through sol-gel technique was investigated in this study. The modified layer of anatase TiO2 cannot be obtained by directly applying TiO2 sol on IF steel surface due to the interference of the thermal diffusion of ferrite atoms. The application of sulfuric acid solution to form a magnetite, Fe3O4, film or the employment of dry Al film serving as an interlayer for blocking the thermal diffusion of substrate atoms was firstly employed. TiO2 precursor sol was then spin-coated on the interlayer. The interference of substrate atoms was retarded during calcination and finally the anatase TiO2 thin film was successfully produced on the surface of IF steel. The goal of this study included: (1) to compare the effect of different systems, Fe/Fe3O4/TiO2 and Fe/Al/TiO2, on the super-hydrophilicity of TiO2 thin films on the surface of IF Steel. (2) to observe the effect of the addition of Fe(NO3)3．9H2O on the super-hydrophilicity of TiO2 thin films on the various systems, Fe/Al/TiO2, Si/Al/TiO2, Si/TiO2 and Ti/TiO2. Surface morphological, structural and compositional variations were analyzed by scanning electron microscopy (SEM), X-ray diffractometry (XRD), Raman scattering spectroscopy, glow discharge optical spectrometry (GDOS) and ultraviolet-visible spectroscopy (UV-Vis). The results were: (1) Fe3O4 thin film in the Fe/Fe3O4/TiO2 system served as an efficient iron diffusion barrier so that Fe3O4/TiO2 laminated film exhibited significant super-hydrophilicity. (2) minor addition of Fe(NO3)3．9H2O into the precursor sol of TiO2 in preparing Fe/Al/TiO2 system was contributive to the blue shift of the absorption edge of the Al/TiO2 laminated film.

並列關鍵字

IF steel ； super-hydrophilic ； Fe3O4/TiO2 laminated coating

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