以化學方法合成鐵鉑合金奈米微粒與磁性質之研究

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研究生：	鍾加琪 Chung, Chia-Chi
論文名稱：	以化學方法合成鐵鉑合金奈米微粒與磁性質之研究 Study on the synthesis of FePt nanoparticles and magnetic properties
指導教授：	賴志煌 Lai, Chih-Huang
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：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	83
中文關鍵詞：	鐵鉑合金奈米微粒、磁性質
外文關鍵詞：	FePt nanoparticle, magnetic properties
相關次數：	點閱：1 下載：0
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磁性奈米微粒近年來受到廣大的關注，在生醫方面，例如:藥物投遞(drug delivery)、核磁共振造影(MRI)，或是在記錄媒體上，廣泛被應用。其中在記錄媒體方面，鐵鉑合金(FePt)最受矚目，因其具有高異向性，可解決超順磁所產生的問題。所謂超順磁現象，意旨當粒子尺寸趨近奈米尺寸時，磁矩易受到熱擾動的影響。
鐵鉑奈米微粒的合成目前遇到最大瓶頸在於，其尺寸不易增大。再者，當尺寸增大時，鐵和鉑的比例會受到尺寸的影響而形成鉑偏多的鐵鉑微粒。然而，鐵鉑合金的磁性質易受到成分的影響，當鐵和鉑的比例偏離一比一時，矯頑場(Hc)會有很明顯的下降。
論文主軸是以化學方法合成鐵鉑合金奈米微粒，藉由調變合成參數，例如:界面活性劑、加熱時間以及加熱溫度，來改變微粒尺寸以及成分。並探討這些合成參數對尺寸和成分的影響。再藉由後退火處理，使鐵鉑合金產生序化。我們採用鐵鉑合金微粒和食鹽混合來防止奈米微粒在高溫熱處理下產生聚集。從實驗結果可知，食鹽可作為阻絕層，有效止奈米微粒在高溫下的聚集。最後，將探討FePt和FePt3之間的交互耦合作用在磁性質上的特殊性。

The larger size of FePt nanoparticles is a big challenge in recent years. In my work, controlling size distribution and composition of FePt nanoparticles by thermodecomposition method is the main topic. As-synthesized FePt nanoparticles are chemically disordered and post-annealing is required to obtain chemically ordered FePt. Salt matrix-aid effect in annealing steps of as-synthesized FePt nanoparticles and the magnetic properties of annealed FePt alloy are studied. The exchange coupling phenomenon between FePt (FM) and FePt3 (AFM) nanoparticles was demonstrated and discussed in the final section.

Abstract (Chinese)……………………………………………………………………Ι
Abstract (English)…………………………………………………………………….Π
Contents………………………………………………………………………………Ш
List of figures…………………………………………………………………………V
List of tables………………………………………………………………………...ΙX


Chapter 1 Introduction    1
1 Motivation    1
Chapter 2 Background    3
1 Special Features of Magnetic Nanoparticles    3
1.1 Superparamagnetism    3
1.2 Single domain    5
1.3 Surface Anisotropy    6
2 Introduction to Core/Shell Magnetic Nanoparticles    9
2.1 Synthetic approaches to the core/shell nanoparticles    9
2.2 Magnetic properties of the core/shell nanoparticles    11
3 Introduction to FePt nanoparticles    16
3.1 Characteristics of FePt alloy    16
3.2 Synthesis of FePt nanoparticles    18
3.3 Shape control of FePt nanoparticles    22
3.4 Annealing effects on FePt nanoparticles    26
4 Introduction to Magnetite    30
4.1 Properties of Magnetite    30
4.2 Synthesis of Magnetite Nanoparticles    31
4.3 Shape-Controlled Synthesis of Magnetite Nanoparticles    34
Chapter 3 Experimental Design and Analysis Technique    40
1 Experimental procedures    40
2 Experimental Design    41
2.1 The apparatus of experiment    41
2.2 Reagent list    42
2.3 Procedures of experiment    42
3 Analysis equipments    43
3.1 Vibrating Sample Magnetometer (VSM)    43
3.2 X-Ray Diffraction (XRD)    45
3.3 Transmission electron microscope (TEM)    46
Chapter 4 Results and Discussion    48
1 Synthesis of FePt nanoparticles    48
1.1 Size control of FePt nanoparticles    49
1.2 Composition control over FePt nanoparticles    57
2 Magnetic properties of annealed FePt nanoparticles    62
2.1 Phase transformation of FePt nanoparticles    62
2.2 Magnetic properties of FePt and FePt3 nanoparticles    65
2.3 FePt nanoparticles annealed in salt matrix    68
3 Nanocomposite of FePt and FePt3    72
3.1 Magnetic properties of the mixture of FePt and FePt3    73
3.2 The mixture of FePt and FePt3 annealed in salt matrix    75
Chapter 5 Conclusions    79
References    80

                                

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