本論文主要探討金奈米棒的熱穩定性。金奈米棒會因為受熱而同時產生熔化與變形，金奈米棒的長寬比會影響其定域化表面電漿共振效應，所以在高溫下，金奈米棒的表面電漿共振吸收會發生改變。本論文採用單矽源、雙矽源在事先製備的金奈米棒表面包覆二氧化矽增強其熱穩定性；再透過水熱法進一步穩定外層二氧化矽結構，最後經由高溫爐進行高溫燒結，測試其熱穩定性，透過上述處理，可以很明顯地避免金奈米棒在高溫變形，使金奈米棒在熱穩定性被改善後，可以應用在輔助改善染料敏化太陽能電池光電轉換效率。

Thermal stability of gold nanorods (AuNRs) is mainly investigated in the thesis. Both the melting and deformation of AuNRs were observed at high temperatures. Localized surface plasmon resonance (LSPR) of AuNRs is determined by the aspect ratio of AuNRs. LSPR absorption will be changed at high temperatures. The surface of the prepared AuNRs is coated with silica by adding one or two silicon reagents. And the structure of outer silica was further stabilized by the hydrothermal method. Silica-coated AuNRs are calcined by high-temperature furnace to test their stability. The melting and deformation of AuNRs can be significantly prevented by the above treatments. Therefore, silica-coated AuNRs with the enhanced thermal stability could be usefully applied in improving photoelectric conversion efficiency of dye-sensitized solar cell.

目錄

第一章、緒論	1
1.1奈米材料	1
1.2奈米材料性質	2
1.3定域化表面電漿共振	3
1.4表面增強拉曼散射	4
1.5奈米粒子熱穩定性	5
1.6研究動機與目的	6
第二章、實驗	7
2.1實驗藥品	7
2.2實驗儀器	8
2.3金奈米棒合成	9
2.4金奈米立方體合成	10
2.5單矽源包覆二氧化矽	11
2.6雙矽源包覆二氧化矽	11
2.7透過水熱法穩定二氧化矽	12
2.8金奈米棒熱穩定分析	12

第三章、結果與討論	13
3.1金奈米棒的合成與分析	13
3.2在500 ℃燒結AuNRs	14
3.3在450 ℃燒結AuNRs	16
3.4在375 ℃燒結AuNRs	18
3.5金奈米立方體	20
3.6在500 ℃燒結AuNCs	22
3.7包覆二氧化矽改善熱穩定性	23
3.8雙矽源包覆SiO2 (NaOH-APTES-TEOS)	27
3.9雙矽源包覆SiO2 (APTES-HCl-Na2SiO3)	28
3.10雙矽源包覆SiO2 (APTES-NaOH-TEOS)	29
3.11 APTES-NaOH-TEOS燒結測試	31
3.12 APTES-NaOH-TEOS水熱	32
3.13 APTES-NaOH-TEOS水熱後燒結測試	34
第四章、結論	38
第五章、參考資料	40


圖目錄
圖3.1 AuNRs的UV-Vis光譜圖	13
圖3.2 AuNRs的TEM影像圖	14
圖3.3 500 ℃燒結溫度程序與時間對照圖	15
圖3.4 在500 ℃燒結後，AuNRs的TEM影像	16
圖3.5 450 ℃燒結溫度程序與時間對照圖	17
圖3.6 在450 ℃燒結後，AuNRs的TEM影像	18
圖3.7 375 ℃燒結溫度程序與時間對照圖	19
圖3.8 在375 ℃燒結後，AuNRs的TEM圖	20
圖3.9 AuNCs的UV-Vis光譜圖	21
圖3.10 AuNCs的TEM圖	21
圖3.11 在500 ℃燒結後，AuNCs的TEM影像	22
圖3.12 在AuNRs中加入不同體積 (A) 2.5 (B) 3.5 (C) 4 (D) 5 μL TEOS的TEM圖	24
圖3.13 在AuNRs中加入不同體積 (A) 30 (B) 50 (C) 100 μL NaOH (0.1 M)後，再加入5 μL TEOS的TEM圖	26
圖3.14加入 (A) 2 μL APTES、3μL TEOS (B) 1 μL APTES、4μL TEOS (C) 2 μL APTES、4 μL TEOS的TEM圖	28
圖3.15 加入1.5 μL APTES，再加入 (A) 5 (B) 8 (C) 10 μL HCl (0.1 M)最後加入3 μL Na2SiO3	29
圖3.16 分別加入 (A) 15 μL APTES和45 μL TEOS (B) 30 μL APTES和30 μL TEOS (C) 30 μL APTES和15 μL TEOS的TEM圖	30
圖3.17 加入15 μL APTES和45 μL TEOS後，所得AuNCs@SiO2的TEM圖	31
圖3.18 AuNCs@SiO2在 (A) 375 (B) 450 (C) 500 ℃高溫燒結	32
圖3.19 AuNCs包覆SiO2與水熱後UV光譜圖	33
圖3.20 AuNCs@SiO2水熱後TEM圖	33
圖3.21 AuNRs包覆SiO2與水熱後UV光譜圖	34
圖3.22 AuNRs@SiO2水熱後TEM圖	34
圖3.23 AuNCs@SiO2在375 ℃燒結後的TEM圖	35
圖3.24 AuNCs@SiO2在450 ℃燒結後的TEM圖	35
圖3.25 AuNCs@SiO2在500 ℃燒結後的TEM圖	36
圖3.26 AuNRs@SiO2在450 ℃燒結後的TEM圖	36
圖3.27 AuNRs@SiO2在500 ℃燒結後的TEM圖	37

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