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Fabrication and applications of nanoporous anodic aluminum oxide on TiN/Si substrates
Huang, Huei Nuan
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|摘要:||本研究主要是利用Al/TiN/Si製備多孔氧化鋁(AAO)模板。實驗中分別使用磷酸與硫酸混合溶液，於40℃定電壓20 V (製程I)、0.3 M草酸，於室溫定電壓40 V (製程II)，以及二階段製程(先製程I再製程II)進行陽極氧化形成奈米多孔氧化鋁 (AAO) 模板，並藉由場發射掃描式電子顯微鏡(FE-SEM)觀察AAO之微結構，以X光光電子能譜儀 (XPS) 分析氧化物之化學組態，並探討其應用。
由微結構形貌及化學組態分析可得知，原始鋁膜厚度約1.55 μm，經製程I陽極氧化反應後，可形成孔徑約35 nm厚度約2.77 μm之含硫酸根及磷酸根奈米多孔氧化鋁，其孔徑及厚度分別為經製程II所形成氧化鋁模板之1.4及1.35倍，且多孔氧化鋁與緻密氧化鋁厚度比值，隨孔洞大小增加而增加。另外經二階段製程陽極氧化可形成雙層奈米多孔氧化鋁，上層結構為由製程I所形成含硫酸根之氧化鋁，而下層則為製程II所生成。
在應用方面則是以製程II所形成之氧化鋁模板 (AAO/TiN/Si)，先以負偏壓去除阻障層後，接著以電化學直流沈積方式，分別於酸性 (pH=4.5~5) 硫酸銅溶液成長奈米銅線及鹼性 (pH=12) 硫酸銅溶液成長奈米氧化亞銅線。以EDS及X光繞射儀分析所成長之奈米銅及氧化亞銅線其元素成分及結晶相，並探討所施加之電壓及反應時間對奈米線長度之影響。在定電壓0.1 V及酸性條件下，電鍍1小時後可獲得直徑約85 nm及長度約950 nm之奈米銅線，而所成長銅線之長度隨電鍍時間增加而呈線性增加。另一方面，在電壓為0.5 V及鹼性條件下，電鍍20分鐘後則可獲得直徑約80 nm及長度約1.2 μm之奈米氧化亞銅線，在相同電鍍時間下，氧化亞銅線之長度隨著施加電壓上升而迅速增加。
此外，本研究亦將在玻璃基材上鍍著鋁薄膜(Al/Glass)，並以10 wt%磷酸、0.3 M草酸及15 wt%硫酸溶液進行陽極氧化形成透明之多孔氧化鋁模板，以可見紫外光譜儀 (UV-VIS) 量測200-1100nm波長範圍之反射率，探討週期性孔洞大小及氧化層厚度對光學性質之影響。經光譜圖觀察得知，本實驗所得之多孔氧化鋁，其反射率具週期性變化，在紫外光波長範圍均有大於20 %之反射率具有抗紫外線之功能，其中使用草酸溶液所形成的AAO模板具有最大之反射率；而相同孔洞週期之多孔氧化鋁，隨氧化層厚度增加，可見光之反射波長往長波長區段移動。|
In this research, nanoporous anodic aluminum oxide (AAO) templates were fabricated by anodizing Al films on TiN/Si substrates. Two kinds of processes were employed to prepare AAO templates with different pore sizes. One was using H3PO4/H2SO4/DI-water mixture as an electrolyte at 40 ℃ with 20 V applied voltage (process I), and the other one was employing 0.3 M H2C2O4 at room temperature with 40 V applied voltage (process II). Additionally, double-layered AAO templates were fabricated with two-step anodic oxidation (processes I + II). Field-emission scanning electron microscopy (FE-SEM) was used to investigate the resultant microstructure of AAO and X-ray photoelectron spectroscopy (XPS) was utilized to identify the chemical state of the oxide. The thickness of as-deposited Al film was 1.55 μm. From process I AAO consisted of SO42-and PO43- ions and exhibited a diameter of 35 nm and thickness of 2.77 μm, which were 1.4 and 1.35 times larger than that obtained from process II. The thickness ratios of AAOs increased with increasing pore sizes. In the double-layered structure made by a two-step possess, the upper layer of AAO was formed from process I and lower layer was produced from process II. As for application, process II was used to prepare AAO/TiN/Si and the barrier was removed applying a reverse-bias voltage. Afterwards, copper nanowires and cuprous oxide nanowires were grown by electrochemical deposition in acidic (pH=4.5~5) and basic (pH=12) copper sulphate solution. EDS was used to analyze the resultant elements of nanowires and X-ray diffraction was utilized to identify the crystalline phase. Moreover, influences of the applied voltage and reaction time on the length of nanowires were also discussed. Cu nanowires with a diameter of 85 nm and a length of 950 nm could be obtained after electrochemical deposition for 1 h in acidic electrolyte at 0.1 V. Based on same applied voltage, the lengths of Cu nanowires increased linearly with increasing reaction time. Moreover, 80 nm in diameter and 1.2 μm in length of Cu2O nanowires could be obtained after deposition for 20 min in basic electrolyte at 0.5 V. Based on same deposited time, the lengths of Cu2O nanowires increased quickly with increasing applied voltage. Al films were also deposited on glass substrates to fabricate transparent AAO templates by anodic oxidization used in this study. Three different electrolytes, 10 wt% H3PO4, 0.3 M H2C2O4, and 15 wt% H2SO4 were employed to prepare AAO templates with different pore sizes. Influences of the pore size and the thickness of oxide on optical properties were investigated by using ultraviolet and visible spectrophotometer (UV-VIS) to measure the reflectivity of AAO films in wavelengths ranging from 200 to 1100nm. The spectra revealed all AAO templates possessed periodic reflectivity and larger than 20 % in the ultraviolet range. The templates made from oxalic acid solution have highest reflectivity. Moreover, the red shift of the reflectivity in the visible light range increased with increasing thickness of AAO films that have similar pore sizes.
|Appears in Collections:||材料科學與工程學系|
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