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研究生:傅鈞榆
研究生(外文):Chun-Yu Fu
論文名稱:二維鐵磁性三溴化鉻與三碘化鉻層狀之磁異相性
論文名稱(外文):Magnetic Anisotropy in 2D Ferromagnetic Layers CrBr3 and CrI3
指導教授:馬遠榮馬遠榮引用關係
指導教授(外文):Yuan-Ron Ma
口試委員:賴建智李尚凡
口試委員(外文):Chien-chi LaiShang-Fan Lee
口試日期:2020-10-08
學位類別:碩士
校院名稱:國立東華大學
系所名稱:物理學系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2020
畢業學年度:109
語文別:中文
論文頁數:52
中文關鍵詞:三碘化鉻三溴化鉻
外文關鍵詞:CrI3CrBr3
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  • 被引用被引用:0
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  • 下載下載:5
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我們使用純鉻粉和碘片作為前體,通過化學氣象傳輸法(CVT)合成了二維(2D)三碘化鉻(CrI3)單晶。我們通過場發射掃描式電子顯微鏡(SEM),能量色散X射線光譜(EDS),X射線光電子能譜(XPS),X射線繞射(XRD),光致螢光之光譜(PL)比較了其與三溴化鉻(CrBr3)的組成其表面特徵,發現表面皆為層狀結構,證明次兩種化合物皆有二維材料的特徵,亦得知三碘化鉻由碘與各組成,三溴化鉻由溴與鉻組成,且前者為三方晶系後者為六方晶系。接著透過超導量子干涉儀量測此兩種樣品的磁性 此兩種鉻之鹵化物晶體在低溫皆為鐵磁性其居禮溫度分別為61 K 與37 K且分別具有不同的磁晶異相性。在因二維鹵化鉻晶體具有磁性的前提下,他們亦是一種類似石墨烯的材料,在製造低尺寸半導體元件方面顯示出相當潛力。
We synthesized the two-dimensional (2D) chromium tri-iodide (CrI3) single crystal layers using horizontal directional solidification method (HDSM) with pure Chromium and Iodine as precursors. These 2D single crystal layers were grown in a sealed quartz tube. We analyzed the morphology, crystal structure, and chemical composition of CrI3 using field emission scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), photoluminescence spectroscopy (PL). The physical and chemical properties of 2D CrI3 and CrBr3 (hq graphene) were studied in parallel. Being a graphene like material along with magnetic properties the 2D Chromium halides layers shows potential applications in low dimensional magnetic semiconducting devices.
目錄
Abstract I
摘要 II
目錄 III
圖目錄 V
第一章 文獻回顧與導論 1
1.1 二維材料 1
1.2石墨烯 2
1.3三碘化鉻 4
1.4三溴化鉻 6
1.5三碘化鉻的磁性性質 7
1.6三溴化鉻的磁性性質 9
1.7研究動機 10
第二章 實驗流程與製備儀器 11
2.1 真空封管系統 11
2.2 單區管型爐 12
2.3 實驗之樣品與材料 12
2.4 實驗參數與步驟 13
第三章 分析儀器與原理 17
3.1 場發射掃描式電子顯微鏡 (FESEM) 17
3.2 X射線繞射儀 (XRD) 19
3.3 X射線光電子能譜儀 (XPS) 20
3.4 超導量子干涉儀(SQUID) 22
3.5 光致螢光光譜 (PL) 24
3.6拉曼光譜 (RAMAM) 25
第四章 實驗結果與討論 27
4.1三碘化鉻之分析 27
4.1.1光學顯微鏡與掃描式電子顯微鏡下之三碘化鉻晶體 28
4.1.2能量散射X光光譜 29
4.1.3 X光光電子能譜分析 30
4.1.4 X光繞射分析 31
4.1.5超導量子干涉儀之磁性分析 32
4.2 三溴化鉻之分析 35
4.2.1光學顯微鏡與掃描式電子顯微鏡下之三溴化鉻晶體 35
4.2.2能量散射X光光譜 37
4.2.3 X光光電子能譜分析 37
4.2.4 X光繞射分析 39
4.2.5 螢光性質分析 40
4.2.6拉曼光譜分析 41
4.1.5超導量子干涉儀之磁性分析 42
第五章 結論 47
參考文獻 49
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