以電化學法製備奈米陣列與奈米多孔陣列結構及其性質探討

Preparations and Characterizations of Nanoarray and Porous Nanoarray Structures with Electrochemical Processes

黃功勛(Kung-Hsun Huang)

指導教授 ： 呂世源

國立清華大學/工學院/化學工程學系/碩士(2006年)

摘要

在本論文中，首重的研究為具高規則排列陣列結構之製備。接著再以所製備出的陣列結構作為起始模板，搭配製程簡單、成本低廉的電化學系統，進行奈米陣列與奈米多孔陣列結構的電鍍製備。
首先，我們利用無乳化劑乳化聚合法，製備出具有不同尺寸的聚苯乙烯次微米粒子(250奈米、320奈米、400奈米與440奈米)並以垂直沉積法完成具高規則排列的聚苯乙烯蛋白石球陣列。第二，將上述的聚苯乙烯蛋白石球陣列作為起始模板，經由電鍍聚合法與熱處理去摻雜程序完成低導電度聚吡咯逆蛋白石網狀陣列之製備。再者，利用陽極處理程序，以鋁片為起始材料，在不同的電場與電解液濃度作用下，得到具有高度規則排列，六角圖案結構且孔徑為20奈米與50奈米的陽極氧化鋁膜。
接著在尺寸為440奈米的聚吡咯逆蛋白石球陣列輔助下，先行完成金屬錫蛋白石球陣列的電鍍合成後，再以陽極處理法製備出多孔二氧化錫蛋白石球陣列。所生成的孔洞大小為20~40奈米並具有196m2g-1的高比表面積。
最後，我們讓坡莫合金以蛋白石球陣列、逆蛋白石網狀陣列與奈米棒陣列的結構呈現，並在不同尺寸下分別探討其磁性行為。電鍍合成的坡莫合金具有單軸向與形狀非等向性等性質。最後發現在不同結構中，坡莫合金都呈現隨著陣列粒徑尺寸的減小，矯頑力有隨之上升的趨勢。而在此三種構形中，奈米棒陣列因自身的高長徑比，所以具有最大的矯頑力；逆蛋白石網狀陣列則在磁壁定扎的效應下，具有次之的矯頑力；在蛋白石球陣列中，由於其整體特徵尺寸已接近薄膜塊材，所以得到的矯頑力最為接近薄膜材料、也最低。因此，我們可以藉由形狀異向性的存在，利用不同結構使坡莫合金具有不同的磁性行為表現。

關鍵字

電化學 ； 奈米陣列

並列摘要

In our research, the first important goal was to prepare highly ordered array structures. Then, we used the above array structures as the template to prepare the nanoarray and nanoporous array structures with the electrodeposition process that has the advantages of being simple and low cost.
First, we prepared the polystyrene (PS) sub-micron particles of different sizes (250nm, 320nm, 400nm, 440nm) by means of the emulsifier-free emulsion polymerization and the highly ordered PS opal arrays by means of the vertical deposition. Second, the above mentioned PS opal array was treated as the initial template to prepare the low conductive polypyrrole (PPy) inversed opal network array with the plating polymerization and thermal treatment for un-doping the PPy. Furthermore, by means of anodization, the starting material, aluminum, was etched at different intensities of voltage and different concentrations of electrolyte and was transformed into highly ordered hexagonal pattern templates. Two different pore sizes, 20 and 50 nm, anodized alumina oxide membranes were prepared.
Following, under the assistance of the 440nm pore size PPy inversed opal we prepare the metal tin opal array in advance after plating, and transform it to the porous tin oxide opal array by means of the anodization. The pore size is a range from 20nm to 40nm and the porous tin oxide opal has the high specific surface area (196 m2g-1).
We then prepared three kinds of permalloy structures. They were the opal, inversed opal, and nanorod array structures. We discussed the magnetic properties of the three types of permalloy structures. The plating-synthesized permalloys possessed anisotropic shapes. The results showed that the coercivity gradually increased as the characteristic length of the arrays decreased in all different structures. Among the three different array structures, the nanorod array exhibited the highest coercivity intensity because of its high aspect ratio. As for the inverse opal array, it showed lower coercivity intensity because of the influence of domain wall pinning effect. The opal array possessed the lowest coercivity due to its large characteristic length scale similar to that of the bulk film material. Hence, one can vary the structure of permalloy to make it possess different magnetic properties because of the shape anisotropy of the structure.

並列關鍵字

electrochemistry ； nanoarray

參考文獻

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