臺灣博碩士論文加值系統

奈米複合材料是指在奈米尺度混和兩種或兩種以上的材料所形成的新材料，具有諸多獨特的高功能性質，在電子、磁性、光學及結構材料的開發應用上極具發展潛力。
在本研究中使用氣凝法合成銀鈷固溶體奈米粒子，並用直接分散法來製造奈米高分子複合材料，由相圖得知，此銀鈷系列不僅在固相中完全不互溶，甚至在液相中亦不互溶，藉熱蒸發源將兩種金屬蒸發，在成為氣相時互相碰撞，急速冷卻至液態氮溫度形成銀鈷奈米固溶體，對此固溶體做不同條件的熱處理，以控制奈米微粒之析出。混入高分子製成高分子奈米複合材料，探討其分散性。同時利用XRD，TEM，SEM，EDS，DSC，EXAFS對銀鈷奈米粒子的特性加以分析，並測量其磁阻性質。由實驗結果得知熱處理後鈷從固溶體中析出。其磁阻值變化隨熱處理溫度改變而變化，於400℃熱處理將可得到最大磁阻值，顯示鈷的析出隨溫度上升而增加。

The nanocomposite refers to a new material which hybrids two or more kinds of materials. It has many remarkable properties and potentials in developments of elertrical, magnetic, optic devices and structural material.
Ag-Co nanoparticles are synthetized by the gas condensation method, and Ag-Co nanocomposites are0 prepared by direct dispersion method. The Ag-Co system are immiscible not only in the solid state, but also in the liquid state. In this study, two element are evaporated simultaneous and quench to liquid nitrogen temperature to form nanoprecipitates of these nanoparticles. After different heat treatment., the controlled size of Co nanoparticles will precipitate. The Ag-Co solid solutions are characterized by XRD, TEM, SEM, EDS, DSC, EXAFS and the MR(Magnetoresistance) properties were measured. After anealing, the cobalt diffuse out from the immiscible nanocrystallines solid solutions. The experiment results show the MR values change with the annealing temperatures and the Co concentrations. It exists a maximum MR values after annealing at 400℃ for 1hr.

CHINESE ABSTRACTⅠ
ENGLISH ABSTRACTⅡ
TABLE OF CONTENTⅢ
LIST OF TABLES AND FIGURESⅤ
Chapter 1 Introduction1
Chapter2 Literature Review2
2.1 Nanocomposites2
2.2 Polymer-matrix Nanocomposites4
2.2-1 Electrical Properties5
2.2-2 Mixing and Dispersion8
2.2-3 Dispersion of Nanoparticles11
2.3 The Magnetoresistance12
2.3-1 Ordinary Magnetoresistance(OMR)13
2.3-2 Anisotropic Magnetoresistance(AMR)13
2.3-3 Giant Magnetoresistance(GMR)14
2.4 Immiscible Ag-Co Solid Solution System17
2.5 Study Topic19
Chapter 3 Experimental23
3.1 Sample preparation23
3.1-1 Ag-Co nanoparticle preparation23
3.1-2 Ag-Co/PAN nanocomposite preparation25
3.1-3 Pre-treatment of the Ag-Co nanoparticles25
3.2 Specimen Analysis26
3.2-1 Structure and Image Analysis26
3.2-2 Particle Size Distribution Measurement26
3.2-3 Differential Scanning Calorimetry (DSC)27
3.2-4 EXAFS Experiment27
3.2-5 MR (magnetic resistance) Mearsurement28
Chapter 4 Result and Discussion33
4.1 XRD Analysis33
4.2 TEM Analysis34
4.3 SEM and EDS Analysis34
4.4 EXAFS Analysis35
4.5 DSC Analysis36
4.6 Viscosity Measurement and Average Particle Size Distribution in PAN /DMF Solution36
4.7 Magnetic Properties Analysis39
Chapter 5 Conclusion64
Chapter 6 Future Works65
References66

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