Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16876
標題: 超微電極化學感測器的研發與製作
Fabrication of sensors based on metal nanoparticle-deposited screen-printed edge band carbon ultramicroelectrodes
作者: 周志宏
Chou, Chih-Hung
關鍵字: Screen-printed edge band carbon ultramicroelectrode;網版印刷超微電極;sensor;nano-particle;感測器;奈米顆粒
出版社: 化學系所
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摘要: 
本論文以網版印刷超微電極為工作平台,利用簡單快速之電化學還原法製作奈米催化材料以發展感測器。超微電極特有之邊緣擴散效應不僅有利於電化學還原反應中金屬粒子均勻分散,更因為低背景電流而有助於電化學分析應用。此外Nafion的角色為固態電解質、高吸濕性之氣體穿透薄膜進而幫助三電極之電子傳導與氣體分子傳達至電極表面。因此結合此三項重要元素,本研究成功製作出分散均勻、粒徑均一之高催化性奈米白金粒子超微電極,並且成功開發以奈米白金超微電極為工作平台之一氧化碳、甲醛及雙氧水之氣體感測器。依據此三種分析物之化學特性證明奈米白金超微電極之氣體感測器的應用廣泛。本論文實驗部分含有四個章節,第一部份是奈米白金超微電極偵測一氧化碳氣體,有良好線性且不被一氧化碳毒化,具有高靈敏度與重複性。第二部分為甲醛偵測實驗,利用逆向方波伏安法成功解決白金還原與甲酸氧化訊號重疊,進而增加奈米白金超微電極偵測甲醛之靈敏度與選擇性。第三部分為偵測氣態雙氧水,奈米白金對雙氧水有優異之氧化力,因此達到6個等級之線性範圍。此外利用化學特性差異達到高選擇性偵測氣態雙氧水,此氣體雙氧水具有良好穩定性與再現性。最後成功利用酒精氧化酵素以延伸發展乙醇感測器,可成功偵測酒類飲料之酒精含量。第四部份是製作奈米雙金屬超微電極,簡單快速修飾奈米雙金屬於超微電極表面。此材料對葡萄糖及氧氣具有優越之催化能力,以利未來發展生物燃料電池及感測器。

In this research, we develop versatile sensors based on electrodeposition of catalytic metal nanoparticles (e.g., Pt and Au) on a screen-printed edge band ultramicroelectrode (SPUME) with Nafion as the solid polymer electrolyte. On designing a specific gas sensor, we use screen printing technology to mass produce carbon edge band ultramicroelectrode, which is well developed by our group. The edge diffusion effect at the SPUME, stabilizing the generation rate of hydrogen and accelerating the mass transfer of Pt solution, is believed to play a key role on achieving the nanoparticles deposition with homogeneous size and distribution. By using the NPt-SPUME, we successfully develop carbon monoxide, formaldehyde, and hydrogen peroxide gas sensors. As to the disposable CO gas sensor, the linear range is up to 1000 ppm with correlation coefficient and sensitivity of 0.994 and 3.76 nA/(ppm‧cm2), respectively. To develop the formaldehyde gas sensor, the employment of reverse square wave voltammetry (SWV) is essential for high sensitivity. The formaldehyde oxidation mechanism is similar to the formic acid fuel cell study and thus the overlapped responses from the reduction of platinum oxide and the oxidation of formic acid are effectively discriminated, resulting in detecting low levels of formaldehyde with high selectivity. We further develop the detection of gaseous hydrogen peroxide at an NPt-SPUME with the help of Nafion membrane. Gaseous H2O2 evaporated from aqueous H2O2 in various concentration is determined in the linear range of 0.5 ppbv - 89.6 ppmv H2O2 (g) (5 uM - 900 mM H2O2 (aq)) with R2 and LOD of 0.9995 and 0.03 ppbv H2O2(g) (0.35 uM H2O2(aq)) (S/N = 3). Selective analysis of H2O2 in high dose (2 mM) of interferences such as methanol, ethanol, acetaldehyde, ascorbic acid, dopamine and uric acid is well proved by employing our method. Real sample analysis results in recoveries within 97.2 %−102.1% for 7 different samples. Additionally, the direct gaseous H2O2 signals are linearly proportional to ethanol concentration in the range of 5.2 uM-4.9 mM (R2 = 0.9997), showing a detection limit of 0.26 uM (S/N = 3). This method overcomes the limitation of previous amperometric hydrogen peroxide sensors bringing outstanding qualitative and quantitative results. We also successfully fabricate a bimetallic nano-AuPt material on SPUME, which have good electroactivity for oxidation of glucose in neutral medium and reduction of oxygen.
URI: http://hdl.handle.net/11455/16876
其他識別: U0005-1708201122355800
Appears in Collections:化學系所

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