本研究利用表面增顯紅外光譜儀(SEIRAS)及循環伏安儀(CV)來探討烷基胺分子在黃金表面上的即時(in-situ)自組裝行為，主要探討溶液的酸鹼性(酸性及中性)、表面電位、以及烷基胺分子(R-NH2)的碳鏈長度對於烷基胺在金表面上的吸附行為及其吸附薄膜特性的影響。
實驗結果發現，於酸性溶液(HClO4)中，胺分子會質子化為R-NH3+，在溶液中有良好的溶解度。此質子化的R-NH3+在開路電位或負電位下，都無法與金表面進行化學吸附。但若將電極電位先控制在負偏壓(-0.9V)，再緩慢的調升電位，在電位升至0.2V時，可觀察到碳氮鍵(-CN)的吸收峰，表示質子化的烷胺分子與金表面進行化學吸附，轉化為烷基胺分子(R-NH2)。此轉化過程約需30至40分鐘，但此一鍵結形成後，就很穩定，即使將電極電位再調回負偏壓，亦可穩定存在。不同鏈長的胺分子都有類似的吸附行為。
於中性系統中，胺分子會以質子化(R-NH3+)及非質子化(R-NH2)的形式存在，其吸附行為會受到碳鏈長度及表面電位的影響。在開路電位下，六碳胺及十二碳胺分子皆可在金表面上進行吸附，主要是非質子化(R-NH2)與表面的反應。但在正、負偏壓下，兩者有不同之表現。對六碳胺而言，非質子化分子(R-NH2)的濃度高，是控制表面反應的主要成份，因此，胺分子的吸附量會隨電位增加而變大。相反的，因十二胺(C12-NH2)在中性溶液中的溶解度低，十二碳胺系統的吸附行為主要受質子化的C12-NH3+分子所控制。不論是在負或正偏壓下，C12-NH3+分子都會在表面進行物理性吸附，形成一結構障礙層，阻撓C12-NH2分子與表面的反應。胺分子在中性溶液下改變電位的吸附行為，與其在酸性系統中的結果類似。R-NH3+會在負偏壓下先吸附於表面，隨著電位調升，R-NH3+會與表面進行化學鍵結。

A surface-enhanced infrared spectroscopy (SEIRAS) and cyclic voltammetry (CV) are utilized to in-situ study the self-assembly behavior of alkyl amine molecules on gold surface. It is mainly discussed about effects of the situations under acidic and neutral system, applying potential and chain length.
In acid solution (HClO4), alkyl amine molecules will be protonated to R-NH3+ and well dissolve in it. The protonated R-NH3+ can not adsorb on gold surface under OCP or negative potential. We can observe the carbon nitrogen bonds (-CN) appear when the surface potential shifts from negative site (-0.9V) to more positive site (0.2V), which indicates that the R-NH3+ molecule will transfer to R-NH2 and adsorb on gold surface by chemical bond. It needs 30 to 40 minutes to complete the transfer process. Once the R-NH2 adsorption structure is formed, it still stably remains even if shifting the potential back to negative site. Alkyl amines with different chain lengths show similar behaviors.
In neutral system (KClO4), the R-NH3+ and R-NH2 molecule co-exist in the solution. Its adsorption behavior is influenced by different chain lengths and surface potential. Hexylamine and dodecylamine can adsorb on gold surface under OCP because of the reaction between R-NH2 and surface. However, they have different adsorption behaviors when applying bias. To hexylamine, higher proportion of R-NH2 is the main factor to affect the surface reaction, and its adsorption amount increases with positive potential. As for dodecylamine, it has poorer solubility in neutral solution, and R-NH3+ is the main factor to control its adsorption behavior. C12-NH3+ will form a physical adsorption layer on the surface first which hinders C12-NH2 from reacting with substrate. The alkyl amine’s shifting potential result is similar to it in acid system. R-NH3+ will come close to the surface under negative potential, and adsorb on surface with the increasing of potential.

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