製程參數對Ag@CeO2核殼奈米顆粒中介面結構之影響｜國立臺灣科技大學博碩士論文系統

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研究生：	徐淑琪 Shu-Chi Hsu
論文名稱：	製程參數對Ag@CeO2核殼奈米顆粒中介面結構之影響 Effect of process parameters on interface structure of Ag@CeO2 core-shell nanoparticles
指導教授：	陳詩芸 Shih-Yun Chen
口試委員:	陳良益 Liang-Yih Chen 羅聖全 Shen-Chuan Lo
學位類別：	碩士 Master
系所名稱：	工程學院 - 材料科學與工程系 Department of Materials Science and Engineering
論文出版年：	2016
畢業學年度：	104
語文別：	中文
論文頁數：	74
中文關鍵詞：	核殼結構、電子顯微鏡及能譜分析、介面、奈米顆粒
外文關鍵詞：	core-shell structure, TEM/EELS, interface, nanoparticles
相關次數：	點閱：212 下載：1
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本研究以穿透式電子顯微鏡結合具高靈敏度、高能量解析度之能量分布分析儀及電子能量損失能譜對Ag@CeO2核殼結構奈米顆粒的介面結構進行詳細的分析，探討製程參數對Ag核表面型態，以及後續殼層沉積的影響。Ag@CeO2核殼結構奈米顆粒是以二階段式化學法合成，Ag奈米核以熱輔助光還原法，CeO2殼層則由化學還原法製備。研究結果顯示，以熱輔助光還原法合成的Ag核表面會自發形成一層極薄的氧化層，其緻密性及組成與所使用的基板、成長溫度、以及Ag核的粒徑有關。此氧化層的存在對後續的殼層沉積扮演極重要的角色: 緻密的氧化層，尤其是組成為TiOx時，可得到良好的核殼結構。此外，電子能量損失能譜結果則顯示在Ag核及CeO2殼層間確實有電荷轉移的作用，此現象造成在介面附近的CeO2中Ce3+的比例提高，且此作用的深度和殼層厚度沒有明顯關聯性。

In this study, interfaces between Ag and CeO2 of Ag@CeO2 core-shell nanoparticles (NPs) were investigated by using transmission electron microscopy (TEM) equipped with energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) with high energy resolution. Ag@CeO2 core-shell NPs were synthesized by two-steps chemical reduction method. Effects of process parameters on the feature of surface of Ag core as well as the subsequent deposition of CeO2 shell were studied at first. A native thin oxide layer on the surface of Ag core was observed. Structure of this thin oxide layer was closely related to the type of substrate, growth temperature and the size of Ag core. The existence of native thin oxide layer is essential to the subsequent deposition of CeO2 shell. In addition, according to EELS analysis, charge transfer between Ag core and CeO2 shell was seen, which results in the reduction of Ce4+. At last, it is found that the area affected by charge transfer was narrow and was not dependent on the thickness of CeO2 shell.

摘要	Ⅰ
Abstract	Ⅱ
致謝	Ⅲ
目錄	Ⅳ
圖索引	Ⅵ
表索引	Ⅷ
第一章 緒論	1
1 前言	1
2 研究背景	3
3 研究動機與目的	5
第二章 文獻回顧與理論介紹	7
1 核殼奈米材料	7
1.1無機-無機核殼奈米材料	7
1.1.1半導體核殼奈米材料	7
1.1.2雙金屬核殼奈米材料	8
1.1.3氧化物核殼奈米材料	8
1.2無機-有機核殼奈米材料	8
1.3有機-有機核殼奈米材料	9
1.4無機-生物分子奈米複合材	9
2金屬-金屬氧化物之核殼奈米結構	11
2.1 金屬晶核導向磊晶成長	12
2.2 以分子修飾之金屬核引導金屬氧化物殼層成長	14
2.3 水熱輔助方法	16
3銀(Ag)奈米顆粒-二氧化鈰(CeO2)核殼奈米粒子	17
3.1 Ag@CeO2的特性	17
3.2 CeO2的特性	20
3.2.1 CeO2晶體結構及化學性質	20
3.2.2 CeO2的溫室鐵磁性特性	22
3.3 Ag@CeO2的製備方法	24
3.3.1 Ag奈米粒子的合成	24
3.3.2熱輔助光還原法(Thermally Assisted Photoreducition, TAP)	26
第三章 實驗方法	29
1 實驗流程	29
2 Ag@CeO2核殼結構樣品製備	30
2.1 Ag奈米顆粒之製備	30
2.2 CeO2殼層沉積	31
3 樣品結構及性質分析	33
3.1 低掠角X光繞射(XRD)	33
3.2 紫外線可見光吸收光譜儀(UV-Vis)	35
3.3 掃描式電子顯微鏡(SEM)	36
3.4 穿透式電子顯微鏡(TEM)	36
3.4.1 電鏡樣品製備	36
3.4.2 TEM儀器及功能介紹	37
3.5 X光吸收光譜 (XAS)	38
第四章 結果與討論	41
1 Ag奈米顆粒之合成與微結構分析	41
1.1 在不同基板上(TiO2或CeO2)成長Ag奈米顆粒	45
1.1.1 在TiO2基板上成長	45
1.1.2 在CeO2基板上成長	47
1.2 在不同溫度下(200℃)成長Ag奈米顆粒	49
2 CeO2殼層之製備	52
2.1以化學還原法合成CeO2	52
2.2在具備不同表面形態之Ag顆粒表面沉積CeO2	53
2.2.1於300℃下，在TiO2基板上合成之Ag顆粒	53
2.2.2於300℃下，在CeO2基板上合成之Ag顆粒	55
2.2.3於200℃下，在TiO2基板上合成之Ag顆粒	58
3 Ag@CeO2奈米核殼顆粒介面之探討	61
第五章 結論	66
參考文獻	67

                                

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