利用網印碳膠電極進行氧電漿修飾,並利用循環伏安法測定黃血 鹽及混合溶液,得知此電極之反應性及靈敏度都呈現較差的狀況。因 此,本文將利用自製的碳纖維紙電極作為主要研究,並藉由電漿修飾 探討表面結構特性及電化學伏安法靈敏度之測定。

比較不同氣體電漿(氨、氮、氧)處理對碳纖維紙電極修飾的影 響。伏安法測定溶液時,溶液擴散現象直接影響了碳纖維紙的訊號應 答。在接觸角的測定中,發現氧、氮電漿修飾後皆屬於親水的性質, 但同時檢測目標物時,發現經氧電漿修飾後的碳纖維紙電極明顯提昇 了氧化電流之反應性。因此,本實驗將針對氧電漿修飾的功率及時間 來做探討。

分析部分主要利用FT-IR測量表面官能基的結構存在及其影響;以亞甲基藍吸附法搭配UV-Vis估算出表面酸性(-COOH、Phenolic-OH)官能基之含量;拉曼光譜分析則探討電漿修飾後碳纖維紙表面碳-碳結 構的改變對其電子傳導的影響;利用原子力顯微鏡探討表面結構形貌 及計算表面粗糙度。

循環伏安法的測定中,主要測量食品飲料添加物中常見的化合物 AA、GA、CA,利用氧電漿修飾碳纖維紙電極進行量測,得知混合溶 液時所存在的各別氧化電位,而實驗結果也得知,經修飾後的碳纖維 紙電極能在微量分析中有顯著的高靈敏應答之能力。最後,本實驗嘗 試以禁用防腐劑水楊酸來做測定,可發現當混合物AA、GA、CA、 SA同時檢測時,也能明顯的區分各別氧化電位。

By using screen-printing carbon paste electrode (SPCE) modified by oxygen plasma, and Cyclic Voltammetry to determine ferricyanide and the mixed solution, results show that both the reactivity and sensitivity of electrode are poor.Therefore, this thesis will focus on the study of self- made carbon fiber paper electrode, and the discussion of the characteristics of surface structure according to plasma modification, and the determination of electrochemical voltammetric sensitivity.

After the comparison of the influence of different plasma gas (ammonia, nitrogen, oxygen) treatment on carbon fiber paper electrode, we find that it is in the determination of the mixed solution by Cyclic Voltammetry that the solution diffusion directly affects the response of carbon fiber paper. In the determination of contact angle, we find that carbon fiber paper becomes more hydrophilic after oxygen, and nitrogen plasma modification; meanwhile, in the detection of targets, it’s found carbon fiber paper electrode modified by oxygen plasma significantly has higher reactivity of the oxidation current. Therefore, this study will focus on the power and time effect of oxygen plasma modification.

The study is mainly to measure the surface functional groups of structure and its influence by using FT-IR, by using Methylene blue adsorption method with UV-Vis to estimate the content of the surface acidic functional groups ( -COOH、 Phenolic-OH ), and by using Raman spectroscopy analysis to discuss the influence of changed carbon - carbon structure of carbon fiber paper surface modified by plasma on electrontransport. Finally, the study also discusses the surface structure morphology of carbon fiber paper and calculates surface roughness by AFM.

In the determination of Cyclic voltammetry, the study is to measure common compounds AA, GA, CA in food and beverage additives. After the measurement by using carbon fiber paper electrode modified by oxygen plasma, we know the existence of individual oxidation potential in mixed solution. Experimental results also show that modified electrodes in Microanalysis can be highly sensitive in response. Finally, in this study, we try to disable the preservatives in the determination of salicylic acid, and in the determination of mixture of AA, GA, CA, SA, we also know the existence of individual oxidation potential.

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