粒徑大小對奈米銀自發磁性之影響; The spontaneous magnetism of silver nanoparticles by particle size

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題名:	粒徑大小對奈米銀自發磁性之影響;The spontaneous magnetism of silver nanoparticles by particle size
作者:	林元媛;Lin,Yuan-Yuan
貢獻者:	物理學系
關鍵詞:	粒徑大小;自發磁性;奈米銀;particle size;spontaneous magnetism;silver nanoparticle
日期:	2013-07-22
上傳時間:	2013-08-22 11:47:15 (UTC+8)
出版者:	國立中央大學
摘要:	對平均?徑1.8 nm、3.5 nm、6.9 nm和9.7 nm的銀樣品，使其在各個不同的溫度下改變外加磁場，進?磁化率量測實驗，探討?徑大小對其自發磁性之影響，並用朗之萬函數進行磁化曲線擬合。本研究使用熱蒸鍍冷凝法製備奈米銀顆粒，利用X光繞射圖譜來判定粒徑大小。和塊材銀的微弱反磁現象不同，奈米銀由於單位體積的表面積增加而產生自旋極化，有明顯的順磁和反磁現象，在1.8 K時1.8奈米的樣品飽合磁化強度約為其它較大粒徑的樣品(從3.5奈米到9.7奈米)的6到13倍且其反磁現象也較強烈；而在300 K時1.8奈米的樣品飽合磁化強度則為其它較大樣品的4到7倍。由修正過的?之萬函?加上修正反磁項擬合所得到不同粒徑大小樣品的磁化曲線圖擬合良好。 This paper discussed the size of silver nanoparticles influences their susceptibility. On the average particle diameter of 2.8 nm, 4.5 nm, 12 nm and 21 nm nano-silver and bulk silver, compared their different temperatures while changing the applied magnetic field, measured their conducting magnetization rate and magnetization intensity to explore the particles size of the spontaneous magnetic effects and magnetization curve fitting. This study was prepared using thermal evaporation condensation nano silver particles, using X-ray diffraction to determine the particle size. And nano-silver reacts differently the non-magnetized bulk silver its surface area per unit volume increases the spin polarization phenomena which have the results in significant paramagnetic and diamagnetic phenomena. at the saturation magnetization of 1.8 nm nanosilver samples is about 6 to 13 times of other larger samples (from 3.5 nm to 9.7 nm) at 1.8 K, and the phenomenon of their diamagnetic relatively strong they have similar phenomena at 300 K and 1.8 K, the saturation magnetization of 1.8 nm nanosilver sample is about 4-7 times of other larger nanosilver sample. After the correction of the .Langevin function with diamagnetic correction, the fitting graphs of different particle size nanosilver show good fit.
顯示於類別:	[物理研究所] 博碩士論文

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