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Student Number 952202038
Author Yen-Ting Kuo(郭彥廷)
Author's Email Address No Public.
Statistics This thesis had been viewed 1215 times. Download 818 times.
Department Physics
Year 2007
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title The spontaneous magnetism of gold nanoparticles by interparticle interaction
Date of Defense 2008-06-20
Page Count 80
Keyword
  • gold
  • interaction
  • nanoparticles
  • spontaneous
  • Abstract Two sets of gold nanoparticles were fabricated by the thermal evaporation method. X-ray diffraction patterns and TEM images showed the mean particle diameters for the two sets of samples to be 3.5 and 6 nm. TEM images reveal an icosahedral shape for the 3.5 nm Au nanoparticles, which corresponds to 923 atoms packed in six icosahedral shells.
      Magnetic properties were studied by ac magnetic susceptibility and magnetization measurements. The M-H curves of 3.5 nm Au nanoparticles can be well described by a Langevin profile plus a Brilliun Zeeman one and a linear diamagnetic term. We found that the spin arrangements of 3.5 nm Au particles are ferrimagnetic in nature, which contained a net spontaneous magnetic moment of 26 μB per particle.
      The effect of interparticle separation was also studied. The low temperature saturated magnetization MS and induced magnetization Mi of the fully packed power were 84% and 59% that of very loosely packed power.
    Table of Content 目   錄
    論文摘要Ⅰ
    AbstractⅡ
    致謝Ⅲ
    目錄Ⅳ
    圖目錄Ⅵ
    第一章  緒論1
    1-1 塊材金的磁特性1
    1-2 奈米金粉立之新穎磁特性4
    1-3 奈米團簇之穩定結構7
    第二章  樣品製備與實驗儀器介紹9
    2-1 低真空熱蒸鍍冷凝製程說明9
    2-2 X光繞射儀介紹11
    2-3 X光螢光光譜分析儀介紹13
    2-4 穿透式電子顯微鏡介紹15
    2-5 物理特性量測系統介紹18
    2-6 壓合模具使用介紹19
    第三章  樣品基本性質分析23
    3-1 粒徑分析23
    3-2 成份分析30
    3-3 樣品團簇的穩定結構31
    第四章  樣品磁性分析探討33
    4-1 變溫磁化率、磁化強度與外加磁場33
    4-2 簡介朗之萬(Langevin)順磁理論42
    4-3 簡介布里淵(Brillouin)方程理論46
    4-4 磁化曲線之擬合分析50
    4-5 不同溫度下磁性特徵之比較分析55
    第五章  顆粒間距對磁化曲線之影響探討58
    5-1 變溫磁化強度、磁化率與顆粒間距58
    5-2 顆粒間距對磁化曲線的影響探討60
    5-3 加熱對樣品磁性的影響探討64
    第六章  結論66
    參考文獻68
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    Advisor
  • Wen-Hsien Li(李文献)
  • Files
  • 952202038.pdf
  • approve immediately
    Date of Submission 2008-07-01

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