顏溪成2006-08-232018-06-282006-08-232018-06-282003-02-20http://ntur.lib.ntu.edu.tw//handle/246246/29419硫醇在金表面形成的自組裝單分子層 除了具有方向性，可使方向控制達分子級 程度之外，分子之間的分布間距也能夠達 到精確的控制，資料顯示硫醇自組裝單分 子層在水溶液中的狀態十分穩定[1]。本研 究採取電化學分析技術，並使用旋轉盤電 極研究電化學反應的動力學機制。實驗中 選擇了三種不同鏈長的烷基硫醇R-SH （R=CnH2n+1 ，n=4 、8 、12 ），當金電極表 面生成硫醇自組裝單分子層後，隨著碳鏈 長度的增加，電極的導電度逐漸下降，氧 化還原反應也越來越偏離可逆反應，硫醇 金電極對Fe(CN)6 3-/4- 和Co(bpy)3 3+/2+ 分子對 的擴散係數都會造成抑制的效果。至於反 應速率常數的表現則是隨著烷基碳鏈長的 增加而反應速率下降，尤其是十二烷硫醇 自組裝層的厚度較大，分子間的排列也較 緊密，幾乎完全將反應分子隔絕在外。In the thesis, alkyl thiols are used to form oriented self-assembly monolayers. Oriented monolayers offer the possibility of precise control of spacing and orientation on a molecular level. It was reported that self-assembly monolayers formed from alkyl thiols are remarkably stable in aqueous solution [1]. This research is mainly carried out by electrochemical analysis techniques, The rotating disk system was applied to study the electrochemical reaction mechanisms. Three different alkyl thiols R-SH （R=CnH2n+1 ，n=4 、8 、12 ）were used in this study. As the alkyl chain length of thiols on gold electrode increases, the conductivity of gold electrode will decrease, the redox reaxtion will derivate from reversible reaction more and more obviously. The inhibition of thiol modified gold electrode to the diffusivities of Fe(CN)6 3-/4- and Co(bpy)3 3+/2+ couples are also discussed in the study. As the alkyl chain length of thiols on gold electrode increases, the reaction rate constants decrease at the same time. Especially for the dodecanethiol modified gold electrode, the thickness of self-assembly monolayer is larger, and molecule will arrange much closer. As a result, the redox couples are almost kept out of the gold surface.application/pdf123342 bytesapplication/pdfzh-TW國立臺灣大學化學工程學系暨研究所電化學方法蛋白質感測器自組裝單分子層修飾金電極electrochemical methodprotein sensorself-assembly monolayermodified gold electrodereporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/29419/1/912622E002009CC3.pdf