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🏛️國立陽明交通大學機構典藏

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    使用多孔模板製作之高分子奈米材料及其應用
    (2010)
    陳俊太
    ;
    Chen Jiun-Tai
    ;
    國立交通大學應用化學系（所）
    一維(one-dimensional)高分子奈米材料具有獨特的性質以及潛在的應用性，因此在 近來引起來極大的興趣。然而相對其他方向而言，只有相對少的研究是關於如何製作一 維的高分子奈米材料。在本計劃中，我們想要利用一個簡單的模板方法來研究不同高分 子與高分子相關之奈米材料的製作與鑑定。在模板的使用上我們會使用陽極氧化鋁模 板。這種模版可以直接買到也可以利用二次陽極氧化(second anodization)的方法來合 成。均聚高分子(homopolymers) 與團聯式共聚高分子(block copolymers) 將會被引入 到氧化鋁模板的奈米級孔洞之中而形成一維的高分子奈米材料。我們將會研究這些奈米 材料由於侷限效應(confinement effect)而產生的形態與特性上的變化。這些製作出來的 高分子奈米材料將可用於自組裝的結構基材(building blocks)以及需要較大表面積的材 料的相關應用。
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    團聯式共聚高分子微胞在受限環境中的自組裝行為
    (2011)
    陳俊太
    ;
    Chen Jiun-Tai
    ;
    國立交通大學應用化學系（所）
    近幾年來，團聯式共聚高分子微胞(Block Copolymer Micelles)的自組裝研究引起 了學術界與工業界廣泛的注意。主要是因為這些微胞在許多不同領域的應用，例如催 化、生物感測、以及藥物傳遞等。這些微胞的形成是由於團聯式共聚高分子在溶液中與 選擇性溶劑相互作用的結果。不同形態的微胞例如球型(spherical) 、圓柱型 (cylindrical)、或是層狀(lamellar)的自組裝結構都在過去幾年相繼的被探討與研 究。但是目前仍有一個很重要但未被深入探討的問題:這些微胞在受限環境(confined geometries)下會有怎麼樣的自組裝行為? 團聯式共聚高分子微胞若是在未受限的環境 之中會形成接近溶液中平衡態的大小與結構，如果這些微胞是在受限的環境之中形成， 則受限效應(confinement effect)預期將會使這些微胞形成特殊的形態(morphology)。 本研究將採用大小可控制的孔洞性氧化鋁模板(porous aluminum oxide templates)來 提供適當的受限環境，以探討團聯式共聚高分子微胞在受限環境下的自組裝行為。我們 將研究不同孔洞大小對微胞產生形態的影響。此外，我們也將利用這些微胞奈米結構來 製作新穎的功能性材料，例如金屬與碳材等。本研究不但在高分子微胞的基礎物理上有 重要的意義，也將對微胞的應用帶來更多的可控性與彈性。
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    Field emission property of carbon nanotube field emitters in triode structure fabricated with anodic aluminum oxide templates
    (2008-04-01)
    Li, Yiming
    ;
    Cheng, Hui-Wen
    ;
    Lin, Chen-Chun
    ;
    Pan, Fu-Ming
    ;
    材料科學與工程學系
    In this work, we study the field emission (FE) properties of carbon nanotubes (CNTs) field emitters in the triode structure fabricated with anodic aluminum oxide (AAO) template. To obtain the self-consistent solution, a set of Maxwell's equations coupling with Lorentz equation are solved simultaneously using finite difference time domain (FDTD) particle-in-cell (PIC) method. The FE current is then computed with the Fowler-Nordheim equation. To validate our simulation model, we firstly calibrate the collected electron current density between the measurement data of fabricated AAO-CNTs and simulation result. We find that the high density of CNTs will result in large screening effect among adjacent emitters and reduce the strength of electric field. Consequently, it significantly affects the collected emission current density. Our prediction shows that more than three-order magnitude difference on the collected emission current density could be observed when the spacing between CNTs is decreased from 0.7 to 0.233 mu m for the explored structure with the diameter of 7 mu m. Effects of random heights and thickness of oxide on the FE property of structure are also discussed.
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    Numerical simulation of field emission efficiency of anodic aluminum oxide carbon nanotube field emitter in the triode structure
    (2008-07-01)
    Li, Yiming
    ;
    Cheng, Hui-Wen
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    In this work, we study the field emission (FE) properties of carbon nanotubes (CNTs) field emitter in the triode structure fabricated with anodic aluminum oxide (AAO) template. To obtain the self-consistent solution, a set of two-dimensional Maxwell's equations coupling with Lorentz equation are solved with a finite difference time domain (FDTD) particle-in-cell (PIC) method. The FE current is then computed with the Fowler-Nordheim equation. Calculated result of the collected current density shows good agreement with the measured data for the fabricated sample. Effect of the height and number of CNTs on the collected electron current density is thus investigated. We find that the explored structure with few number of CNTs exhibit high current density due to insignificant screening effect. The current density is low and approaches to stable current level when the number of CNTs increases. The simulation further predicts that the structure with the height of CNTs = 0.42 mu m has a maximum current density. The FE efficiency (i.e., the collected electron current density/the emission current density) versus the number of CNTs is estimated. The explored AAO-CNTs triode structure maintains high FE efficiency (similar to 95%) with a nonzero gate voltage. (C) 2008 Elsevier B.V. All rights reserved.
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    Effect of Geometric Nanostructures on the Absorption Edges of 1-D and 2-D TiO2 Fabricated by Atomic Layer Deposition
    (2013-05-08)
    Chang, Yung-Huang
    ;
    Liu, Chien-Min
    ;
    Cheng, Hsyi-En
    ;
    Chen, Chih
    ;
    材料科學與工程學系
    2-Dimensional (2-D) TiO2 thin films and 1-dimensional (1-D) TiO2 nanotube arrays were fabricated on Si and quartz substrates using atomic layer deposition (ALD) with an anodic aluminum oxide (AAO) template at 400 degrees C. The film thickness and the tube wall thickness can be precisely controlled using the ALD approach. The intensities of the absorption spectra were enhanced by an increase in the thickness of the TiO2 thin film and tube walls. A blue-shift was observed for a decrease in the 1-D and 2-D TiO2 nanostructure thicknesses, indicating a change in the energy band gap with the change in the size of the TiO2 nanostructures. Indirect and direct interband transitions were used to investigate the change in the energy band gap. The results indicate that both quantum confinement and interband transitions should be considered when the sizes of 1-D and 2-D TiO2 nanostructures are less than 10 nm.
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    Effect of Nonsolvent on the Formation of Polymer Nanomaterials in the Nanopores of Anodic Aluminum Oxide Templates
    (1970-01-01)
    Lee, Chih-Wei
    ;
    Wei, Tzu-Hui
    ;
    Chang, Chun-Wei
    ;
    Chen, Jiun-Tai
    ;
    應用化學系
    "We study the effect of nonsolvent on the formation of polymer nanomaterials in the nanopores of porous templates. Water (nonsolvent) is added into a poly (methyl methacrylate) (PMMA) solution in dimethylformamide (DMF) confined in the nanopores of an anodic aluminum oxide (AAO) template. Water forms a wetting layer on the pore wall and causes the PMMA solution to be isolated in the center of the nanopore, resulting in the formation of PMMA nanospheres or nanorods after the solvent is evaporated. The formation of the polymer nanomaterials induced by nonsolvent is found to be driven by the Rayleigh-instability-type transformation. Without adding the nonsolvent, PMMA chains precipitate on the walls of the nanopores after the solvent is evaporated, and PMMA nanotubes are obtained."