烷基苯電漿及偶氮染料溶液之光譜研究

本論文主要是以光譜學的觀點來作研究，並且探討分子系統中的反應過程。內容將分為兩個部分，再利用光譜的特性去分析各個化合物的結構與性質、能量傳遞以及反應機制等等。第一部分我們以射頻 ( radio-frequency ； RF ) 電源供應器研究甲苯以及二甲苯的分解反應。再以光譜技術研究電漿性質，加上氣相層析質譜儀 ( gas chromatography-mass spectrometry ) 分析其沉積物並探討其生成反應機制。由電漿放光光譜可以看到單元體 ( monomer ) 和激發雙聚體 ( excimer ) 隨著射頻功率的增加而有紅位移的現象。這可以清楚地說明，分子處於激發態時，形成激發雙聚體比形成單元體來的穩定。從氣相層析質譜儀的分析結果可知，甲苯沉積物主要是以二甲苯基 ( bibenzyl ) 為主；二甲苯之沉積物則是以1,2-二甲苯基乙烷 ( 1,2-di-p-toylethane ) 為主。而兩者的沉積物只有微量的多環芳香烴化合物 ( polycyclic aromatic hydrocarbons ； PAHs ) 產生。這是因為我們所使用的電漿源是屬於低溫電漿。第二部份主要在研究甲基橙與甲基紅，分別在不同的pH值溶液中以及與奈米銀溶液混合之後的紫外可見光吸收光譜、螢光光譜以及拉曼光譜的研究。並由拉曼光譜中逐漸改變的訊號強度，來探討甲基橙和甲基紅在奈米銀表面吸附位相與溶液 pH 值改變的關係，以及能量轉換效率。所有實驗證據都指出當 pH 值改變時，甲基橙和甲基紅在奈米銀表面是有不同的結構與吸附位相。

關鍵字

放光；甲苯；拉曼；偶氮染料；螢光；電漿

並列摘要

This thesis focuses on the use of spectroscopy to study reaction mechanisms in molecular system. It is divided into two parts. We use the spectroscopic characteristics of molecules to analyze their structures, properties, energy transfer efficiency, and reaction. In the first part, we used a radio frequency ( RF ) discharge power supply to study the decomposition of toluene and xylene. We could see the monomer and excimer red shift with RF power from optical emission spectroscopy. We also used gas chromatography-mass spectrometry ( GC-MS ) to investigate the deposition from plasma reaction. GC-MS analysis of the deposition has shown that the main toluene plasma reaction product was bibenzyl and was 1,2-di-p-tolylethane for xylene plasma. Only a trace amount of polycyclic aromatic hydrocarbons ( PAHs ) was observed. It is because that the alkylbenzene plasma used in this study is a low-temperature plasma. The second part deals with the characterization of the UV–Vis absorption, fluorescence and surface enhanced Raman scattering ( SERS ) spectra of methyl orange ( MO ) and methyl red ( MR ) on silver colloids at different pH. The gradual change of SERS signals indicate different adsorption orientations of dyes on silver surface when pH is changed and thus, results in different energy transfer efficiencies. Experimental evidence with MO and MR indicate that different molecular structures, different adsorption orientations, and their different energy transfer efficiency of dyes on silver surface exist when pH is changed.

並列關鍵字

emission ； azo-dye ； toluene ； plasma ； fluorescence ； Raman

參考文獻

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烷基苯電漿及偶氮染料溶液之光譜研究

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