聚合型離子液體複合材料修飾電極的開發與應用

The Development and Applications of Poly Ionic Liquid Composite Material Modified Screen-Printed Carbon Electrodes

陳苡伃(Yi-Yu Chen)

指導教授 ： 魏國佐

國立中正大學/理學院/化學暨生物化學系/碩士(2014年)

摘要

本研究目的是利用離子液體能有效固定奈米碳材料於電化學分析應用的研究，以展示離子液體為化學修飾電極的平台所具有的應用潛力；離子液體具有導電的能力，可有效提升電極界面電子傳遞及偵測效果，另外離子液體的特殊化性及物性加上其構造的可調性，這些特性使離子液體形成的化學修飾電極具有特殊的性能。
本研究第一部份加入的奈米碳材為多壁奈米碳管 (MWCNT) 及石墨烯 (Reduced graphene oxide, RGO) 與兩種單體的離子液體 ([C4VIM][PF6] 和 [C9(VIM)2][PF6]2) 混合均勻後利用液滴塗覆法修飾於網版印刷碳電極 (SPCE) 表面，再利用熱聚合的方式形成聚合型離子液體複合材料修飾電極 (CNT-PIL-SPCE 及 RGO-PIL-SPCE)。CNT-PIL-SPCE 及 RGO-PIL-SPCE 相較於 bare SPCE 有更大的表面積，可以增加電流強度，提高電極的反應性。將 CNT-PIL-SPCE 及 RGO-PIL-SPCE 應用於生物鹼與硫醇分子的電催化行為探討。聚合型離子液體可形成固定奈米碳材料的載體，此凸顯出聚合型離子液體可以做為新修飾電極平台的潛力。
本研究第二部份目的是改良原有的聚合型離子液體修飾網版印刷碳電極 (PIL-SPCE new) 製程，測試 PIL-SPCE new 成為檢驗巰基乙酸分子的電極，以擴充 SPCE 的功能。從 SEM 圖當中可以證明，PIL 以薄膜狀覆蓋在 bare SPCE 上。由於離子液體由陰陽離子所組成，具有導電性，且對分析物有靜電吸引力，因此提高電極的反應性。由循環伏安法結果顯示此電極對巰基乙酸分子有電催化功能，使其具有較高的氧化電流及較低的過電位；此外為顯示此電極的高穩定性，以流動注射分析法 (Flow injection analysis, FIA) 來做巰基乙酸定量分析，此驗證聚合型離子液體的耐久性，並且可擴充 SPCE 的實用範圍。

關鍵字

離子液體修飾電極 ； 電化學 ； 離子液體

並列摘要

In this study, we used ionic liquids to immobilize nano-carbon materials on electrode surface for electrochemical analysis. With the conductive ability of ionic liquids, it can effectively enhance the electron transfer and improve the detection sensitivity. The results demonstrate the potential of ionic liquid as the platform of chemical modify electrode (CME).
In the first part of the study, multi-walled carbon nanotubes (MWCNT) and graphene (reduced graphene oxide, RGO) were added to the mixture of two ionic liquid monomers ([C4VIM][PF6] and [C9 (VIM)2][PF6]2), and dropped coating this mixture on the surface of screen printed carbon electrode (SPCE). With thermal polymerized, nano-carbon ionic liquid composite modified SPCEs (CNT-PIL-SPCE and RGO-PIL-SPCE) were created. Due to the large surface area of CNT and RGO, the currents of CNT-PIL-SPCE and RGO-PIL-SPCE are greater than bare SPCE. In addition, the reactive potential is lower. We explored the electro-catalytic behavior of nucleobases and thiol molecules to examine the potential of these composite electrodes.
In the second part of the study, we modified the procedure of poly-ionic liquid modified screen printed carbon electrode developed previously for easy mass production. The new poly-ionic liquid modified screen printed carbon electrode (PIL-SPCE new) was applied to direct electroanalysis of thioglycolic acid (TGA). Since poly-ionic liquid (PIL) that composes of cation and anion possesses conductivity, the oxidation reactivity of TGA is enhanced in PIL-SPCE new due to the electrostatic attraction of analyte by PIL. The oxidation potential is also reduced and results in direct electroanalysis of TGA. We used flow injection analysis to exam the performance of PIL-SPCE new. The preliminary results show the new PIL procedures are reproducible and can apply to mass production of new type CME.

並列關鍵字

ionic liquid modified electrode ； electrochemistry ； ionic liquid

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