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摻雜(鐵、鉻)之氧化鋅奈米顆粒的製作與其結構及磁性質分析 = Synth...

國立高雄大學應用物理學系碩士班

摻雜(鐵、鉻)之氧化鋅奈米顆粒的製作與其結構及磁性質分析 = Synthesis、structure and magnetic properties f (Fe,Cr)-doped ZnO nanoparticles

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Synthesis、structure and magnetic properties f (Fe,Cr)-doped ZnO nanoparticles
作者:	賴浩詮,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2009[民98]
面頁冊數:	68面圖、表 : 30公分;
標題:	奈米顆粒
標題:	ZnO
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/49120144542839253108
附註:	參考書目：面
附註:	指導教授：韓岱君
摘要註:	本研究以溶膠-凝膠(sol-gel)的製程方式製備摻雜鐵、鉻之氧化鋅奈米顆粒，藉由改變鐵、鉻於氧化鋅中的摻雜濃度來探討其結構與磁性質的物理機制。在本實驗中，我們成功地以低溫600 oC製備了Zn1-xFexO(x = 0.01、0.02、0.04、0.05、0.1)與Zn1-xCrxO(x = 0.01、0.02、0.03、0.04、0.05)的奈米顆粒。樣品的微結構和顆粒大小以X光繞射儀(X-ray diffraction)與穿透式電子顯微鏡(Transmission Electron Microscope,TEM)來進行分析，而樣品的磁性質則利用超導量子干涉儀(Superconducting QuantumInterference Device, SQUID)測量之。對於Zn1-xFexO樣品而言，我們由X-ray粉末繞射的分析發現在x ≦ 0.04時的樣品具有純單一相之氧化鋅纖鋅礦結構。而Zn0.96Fe0.04O樣品在室溫具有最大矯頑場87 Oe與飽和磁化量0.05 μB/Fe，即表示此樣品在室溫具有鐵磁性。由X光光電子能譜(X-rayPhotoelectron Spectroscopy, XPS)的分析顯示樣品中的鐵離子之價數為二價和三價同時存在且以Fe3+為主。我們推論樣品內可能存在陽離子空缺(鋅空缺)或樣品中的Fe2+-O-Fe3+之間可能進行交換作用(exchange interaction)而引致樣品具有鐵磁性。另一方面，對於Zn1-xCrxO 樣品而言，由X-ray 粉末繞射的分析顯示在x ≦ 0.02 時之樣品具有純單一相的氧化鋅纖鋅礦結構。我們也發現Zn0.98Cr0.02O 是此系列樣品中在室溫具有最大矯頑場62 Oe 與飽和磁化量0.78 μB/Cr。而由X 光光電子能譜的分析顯示樣品中的鉻離子之價數為三價，我們推測樣品內可能具有陽離子的空缺，這也是導致樣品呈現鐵磁行為的主要原因。 Diluted magnetic semiconductor (DMS) is the material which mixes very fewtransition metal atoms, and shows magnetic property in semiconductor material. Toincrease the proposal in usage, diluted magnetic semiconductor is combined withsemiconductor property and magnetic, as well as of electron spin and electron charge.In this research, we prepared two series nanoparticles of Zn1-xFexO and Zn1-xCrxO bysol-gel method, and studied their structure and magnetic properties systematically.The structural characterization of the samples was studied using X-ray diffraction(XRD) and transmission electron microscopy (TEM). It shows that the secondaryphase presents at x≧0.05 in Zn1-xFexO and x≧0.03 in Zn1-xCrxO samples. We alsoobtained the grain size of the nanoparticles from XRD data and TEM images.Based on the data of the temperature dependence of the magnetization (M-T) andmagnetic hysteresis (M-H), we found that the secondary phase formation reduces themagnetization of single phase Zn1-xTMxO (TM = Fe and Cr). It indicated that thesecondary phase is not responsible for magnetism in our samples. Both Zn0.96Fe0.04Oand Zn0.98Cr0.02O samples are ferromagnetism at room temperature (300 K).The X-ray Photoelectron Spectra (XPS) show that Fe2+ and Fe3+ coexists inZn0.96Fe0.04O but there is only Cr3+ in Zn0.98Cr0.02O. Therefore, in view of the Fe3+ ionsand Cr3+ ions substitution for Zn2+, some carrier-related mechanisms, such asdouble-exchange interaction, must be taken into account to understand the observedRT-FM (room temperature ferromagnetism). Vacancies of Zn may also anotherpossible candidate which led to ferromagnetism. Further research on this issue mightneed to be done in the future to clarify the supposition.

摻雜(鐵、鉻)之氧化鋅奈米顆粒的製作與其結構及磁性質分析 = Synthesis、structure and magnetic properties f (Fe,Cr)-doped ZnO nanoparticles
賴, 浩詮

摻雜(鐵、鉻)之氧化鋅奈米顆粒的製作與其結構及磁性質分析 = Synthesis、structure and magnetic properties f (Fe,Cr)-doped ZnO nanoparticles / 賴浩詮撰 - [高雄市] : 撰者, 2009[民98]. - 68面 ; 圖、表 ; 30公分.
參考書目：面指導教授：韓岱君.
奈米顆粒ZnO

摻雜(鐵、鉻)之氧化鋅奈米顆粒的製作與其結構及磁性質分析 = Synthesis、structure and magnetic properties f (Fe,Cr)-doped ZnO nanoparticles
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