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研究生: 吳仁家
Jen-Chia Wu
論文名稱: 聚胜肽薄膜的合成及應用
Synthesis and Applications of Surface-Grafted Polypeptides
指導教授: 陳家俊
Chen, Chia-Chun
學位類別: 博士
Doctor
系所名稱: 化學系
Department of Chemistry
論文出版年: 2011
畢業學年度: 99
語文別: 英文
論文頁數: 64
中文關鍵詞: 聚胜肽奈米材料二極體
英文關鍵詞: polypeptide, nanomaterials, diode
論文種類: 學術論文
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  • 本篇論文中,我們利用了 (Surface-initiated vapor deposition-polymerization (SI-VDP)) 此高效率的薄膜成長技術,在矽、石英及金的基板上成功的成長了PCBL、PLL、PBLG及PLGA等聚胜肽薄膜,並用此薄膜來做後續之應用。
    首先,我們利用PLL薄膜做為模板來催化tetraethoxysilane的聚合沉積反應,用此仿生反應來形成氧化矽奈米結構。在PLL薄膜的催化下,氧化矽可在常溫、中性的pH值下自發生成。而形成的氧化矽結構和PLL聚胜肽模板膜厚及橫向的微米圖形相當一致。此外,透過調控PLL聚胜肽模板的膜厚及疏密度,還可微調氧化矽奈米結構,令其結構由連續性的薄膜轉變為分離的球狀結構及纖維網狀結構。在利用高溫移除PLL聚胜肽模板後,在穿透式電子顯微鏡(TEM) 下可發現,用此方法可在表面上製造出平均約10奈米的細微通道。我們的方法提供了一個簡單容易且環保的方式,用以形成可調控形、貌厚度與疏密度的氧化矽奈米結構。
    其次,我們成功的利用調控聚胜肽的排列及α螺旋與表面的傾斜角,形成在±0.422V下整流效應達約122的分子二極體。在此,我們利用SI-VDP在金的表面成長PBLG 聚胜肽薄膜並利用solvent-quenching的方式(先以chloroform浸泡薄膜讓PBLG分子鍊伸展到溶劑中,然後再將薄膜轉移到互溶性較差的溶劑acetone中使造成相分離)使聚胜肽分子的α螺旋一致性的向上垂直於基板表面。利用AFM原子力顯微鏡導電模式測量得之 I-V曲線,顯示出良好排列且垂直於表面的聚胜肽結構其整流效應足以用於在二極體的應用之上。

    In this thesis, we use the effective synthetic approach (Surface-initiated vapor deposition-polymerization (SI-VDP)) to fabricate surface-grafted polypeptides on silicon, quartz, and Au surface for further applications.
    Firstly, biomimetic porous silica films have been synthesized by polycondensation of tetraethoxysilane on a soft template formed by “end-tethered poly(L-lysine)” (“t-PLL”) monolayer with a brush-like configuration. The silica formation occurs spontaneously inside the t-PLL at neutral pH and room temperature. The growth of silica fully conforms to the original t-PLL film thicknesses and lateral micro-patterns, regardless of prolonged reaction time and monomer concentration. The morphologies of biomimetic silica are changed from continuous pleated, discrete spherical, to fibrous forms according to the initial t-PLL chain length and surface density. After burning off the t-PLL template, TEM images show the creation of nano-channel arrays in silica with average diameter of 10 nm. Overall, our approach has provided a straightforward and environmentally friendly route to directly generate silica films with controllable morphology, thickness and porosity.
    Secondly, Polypeptide based molecular diode with high rectification ratio (~ 122 at ±0.422V) is formed by controlling molecular order and orientation. A film of tethered poly(γ-benzyl-L-glutamate) (PBLG) with high degree of molecular orientation was formed by solvent pair (good/bad) treatment. I-V characterization of the well aligned polypeptides showed that the rectification ratio of PBLG was sufficiently large for potential diode and transistor applications.

    Abstract 1 Chapter1. Introduction 3 1-1. Secondary Structures of Polypeptide 3 1-1-1. -Helical structure 4 1-1-2. -Sheet 5 1-2. Synthesis of Polypeptides 6 1-3. The Controlling of Molecular Order 7 1-4. Biomimetic Synthesis of Silica Nanostructure 8 1-5. The Electric Properties of α-Helical-Polypeptide Brushes 12 Chapter2. Experimental section 13 2-1. Synthesis of Silica Nanostructure 13 2-1-1. Cleaning of Substrates 13 2-1-2. Silanization of the Substrates with Various Amine Densities 13 2-1-3. Synthesis of t-PLL Brushes 14 2-1-4. Surface Grafted Polypeptide-Templated Synthesis of Silica 15 2-1-5. Calcination of Surface Silica 16 2-1-6. Instrumentations 16 2-2. Synthesis of Well-Aligned PBLG 19 2-2-1. Preparation of Substrates 19 2-2-2. Preparation of Metal Coated Substrates 19 2-2-3. Preparation of Self-Assembled Monolayers 19 2-2-4. Synthesis of Surface-Grafted Polymer Brushes 20 2-2-5. Changing of The Molecular Orientation of t-PBLG Films 20 2-2-6. Preparation of Spin Coated PBLG Film 20 2-2-7. Molecular Orientation Measurements 21 2-2-8. Molecular Structure Imaging 21 2-2-9. Electric Behavior Analysis 21 2-2-10. Calculation of Average Tilt Angles of PBLG Brushes by ER-FTIR 21 Chapter3. Results and Discussions 23 3-1. Biomimetic Synthesis of Silica Films Directed by Polypeptide Brushes 23 3-1-1. In-Situ Synthesis of Silica Nanostructures at Solid Surfaces 23 3-1-2. Molecular Chain Mobility Studied by CD 26 3-1-3.Silica Growth Monitored by in-situ Ellipsometry 26 3-1-4. Patterned Silica films Formation 28 3-1-5. Binary Silanes Treated Surface 29 3-1-6. The Influences of the Grafting Density and Molecular Weight of t-PLL on Silicification 30 3-1-7. Conclusions 32 3-2. Controlled Growth of Aligned α-Helical-Polypeptide Brushes for Tunable Electrical Conductivity 33 3-2-1. Controlled growth of Polypeptide Films 33 3-2-2. Characterization of Molecular Order by ER-FTIR 34 3-2-3. Electric Behavior Analysis by C-AFM 34 3-2-4. Morphological Dependence of the Rectification Ability 36 3-2-5. Data Analysis and Current density Calculation 36 3-2-6. Electric Behavior Measurement by 4-Probe 37 3-2-7. Conclusions 38 Chapter4. Figures and Captions Figure 1. General structure of polypeptides 4 Figure 2. Schematic diagram of the secondary structure (a) -helix and (b) -sheet of polypeptide 4 Figure 3. (a) dipole on each peptide bond. (b) The accumulation of small dipoles along the helical backbone to create a net macrodipoe 5 Figure 4. Controlling of molecular order by (a) electric field; (b) solvent swelling; (c) cross-linking-induced; and (d) solvent-quenching approach 8 Figure 5. Schematic illustration of the hypothesized process of the biomimetic silicification 40 Figure 6. FTIR spectrum of a t-PLL films on silicon wafer 41 Figure 7. CD spectra of t-PLL film and t-PLL/silica film 42 Figure 8.Thickness and refractive index (in water) in the course of silicification 43 Figure 9. SEM and (b) TEMimages of the cross-section of the silica film 44 Figure 10. SEM images of the micropatterned films 45 Figure 11. AFM images of the micropatterned films 46. Figure 12. Schematic illustration of the surface modification processes 47 Figure 13. Water contact angles and thickness measurements as a function of time for different amine density surfaces 48. Figure 14. The morphologies of silica synthesized with different densities of t-PLL films on the surface 49 Figure 15. Schematic illustration of molecular structures and experimental setup 50 Figure 16. The morphological analysis of polypeptide films by AFM and SEM 51 Figure 17. Electrical studies of polypeptide films 52 Figure 18. Relationships between the electrical responses and the topography on Sample Qt-PBLG 53 Figure 19. ER-FTIR spectra of the polypeptide films 54 Figure 20. The results of taking first and second derivative of the I-V curve 55 Figure 21. ER-FTIR spectra of the Qt-PBLG film on the aluminum substrate 56 Figure 22. Current-voltage (I-V) characteristics 57 Figure 23. Current-voltage (I-V) characteristics of Q t-PBLG film at room temperature 58 Chapter5. References 59

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