研究生: |
王良德 Liang-De Wang |
---|---|
論文名稱: |
利用自組裝高分子及聚苯乙烯奈米球形成規則排列的奈米結構 Forming Periodic Nanostructure via Self-Assemble Diblock Copolymer and Polystyrene Nanospheres |
指導教授: |
蔡哲正
Cho-Jen Tsai |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2004 |
畢業學年度: | 92 |
語文別: | 英文 |
論文頁數: | 54 |
中文關鍵詞: | 自組裝 、二嵌段高分子 、聚苯乙烯 、聚甲基丙烯酸甲酯 、奈米球 、矽化物 |
外文關鍵詞: | self-assemble, diblock copolymer, polystyrene, polymethylmethacrylate, nanosphere, silicide |
相關次數: | 點閱:2 下載:0 |
分享至: |
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摘要
本論文主要是利用二嵌段聚苯乙烯和聚甲基丙烯酸甲酯P(S-b-MMA)自組裝高分子和聚苯乙烯奈米球(polystyrene nanosphere)來形成規則排列的奈米結構。不對稱(asymmetric)比例的二嵌段高分子經過真空退火後,會相分離成最密六方的柱狀(PMMA)和網狀(PS)的結構。經過選擇性蝕刻移除掉PMMA後,就可形成孔洞大小約18奈米,孔洞間距約36奈米的模板。雖然形成這規則排列的奈米遮罩後,可發現有一層薄薄的覆蓋層(wetting layer)介於孔洞結構和矽基板之間,但本實驗仍可成功的利用濺鍍的方式來形成規則排列的奈米點結構。
聚苯乙烯奈米球懸浮液經過溶劑揮發後可自組裝地沈積在親水性的基板上。若我們能控制沈積的奈米球為單層(SL)或雙層(DL)的結構的話,就可利用他們來當作鍍膜時所用的遮罩。奈米結構的間距和大小可分別由奈米球的直徑和鍍膜的厚度來調變。此實驗成功的利用奈米球形成六方結構的鉑(Pt)奈米點和NiSi2的陣列。
鉑的奈米陣列經過750OC真空退火後,會由原先三角形的形狀轉變成球形的形狀。而在體積守恆的前提之下,退火後奈米點的直徑d和原始鍍膜厚度t會有以下的關係: ,此處的aSL為原始三角形的高
故我們只要調變原先的鍍膜厚度,就可得到所想要的奈米結構的大小了。
同樣的,我們蒸鍍及濺鍍30奈米厚的鎳奈米陣列在矽基板上。經過900OC的真空退火後,發現原先在矽基板表面上的鎳會透過二氧化矽層和下面的矽形成NiSi2。我們可由形成矽化物長條狀的方向性來間接證明所形成的相的確是NiSi2。而蒸鍍及濺鍍退火後所形成的矽化物其形態會有所不同,我們也可簡單的由原始鍍膜厚度的不均勻來解釋這個現象。
鎳經過退火後所形成規則排列矽化物的基板,可以拿來當作一個晶格調變(lattice-modulated)的基板。而此基板經過更進一步的表面清理後,對於之後應力場方面的研究及應用,開啟了一條寬廣的道路。
Abstract
Two fantastic nanotemplate were produced in this thesis, the self-assemble diblock copolymer and polystyrene nanospheres. These two masks provide low cost, high throughput, large scale and fundamentally simple means to create periodic nanostructure below photolithographic resolution. First, we demonstrate a large-area fabrication of hexagonally ordered nanopore arrays with an area density of 1011/cm2. We can produce mostly distributed 18 nm Pt nano dots with a 36 nm period by using sputtering technique via block copolymer nanolithography with total molecular weight of 67000g/cm3 and the PS volume fraction of 0.7, inspire of the existence of the wetting layer between the periodic mask and the silicon substrate. Further improvement on this experiment mainly depends on the dry etching such as reactive ion etching in order to penetrate the periodic nanopore through the wetting layer without attacking the original hexagonally close packed structure.
The second part, the nanosphere lithography (NSL), was used to fabricate large periodic arrays of Pt nanodots and nickel disilicide. A single layer of self-assemble polystyrene spheres was first uniformly deposited on a silicon wafer as a mask, and then electron beam vaporization or sputter coating technique were used to deposit a metal layer through the mask. Some DL masks and nanostructures were also found somewhere on the substrate. On one hand, in the sputtered Pt case, the size of and inter-particle spacing between the Pt dots are tunable simply by varying deposition thickness t the diameter of the polystyrene spheres D.
The relationship between the dot size after annealing d and as-deposited film thickness t is shown as follows:
On the other hand, we both evaporate and sputter 30nm Ni nanoparticle arrays via this self-assemble nanosphere lithography (NSL). The as-deposited morphology between these two techniques can be easily explained on the perspectives of incident angle and energy. Furthermore, the nickel pattern after annealing at 900oC shows clearly two-directional facet bar in the SEM analysis, which gives us an indirection hint that the bar represents the nickel disilicide phase. As a result, this provides a lattice-modulated substrate and opens a broad way in further research and applications.
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