| Summary: | 碩士 === 南臺科技大學 === 化學工程與材枓工程系 === 104 === The research of sensor is an important research subject. Hydrogen peroxide is widely used in industry. Especially in the food industry, hydrogen peroxide is used for the purpose of sterilization, bleaching and preservation. The food safety has attracted more attention nowadays, and therefore, developing a rapid and convenient hydrogen peroxide sensor is an important research subject. The Cobalt Hexacyanoferrate and Nano Silver Powder possess the catalytic characteristic and they can be used with the carbon powder and carbon paste which possess the high conductivity to make the carbon paste electrode and elevate the responding current of detecting hydrogen peroxide. A study of experimental design involving three factors (operating potential, Cobalt Hexacyanoferrate : Nano Silver Powder and pH value of phosphate solution) and two levels was conducted to analyze the effect of operating parameters on the sensitivity and average responding current of detection of hydrogen peroxide for the carbon paste electrode modified with Cobalt Hexacyanoferrate and Nano Silver Powder. The results of analysis of variance showed that the main effects of operating potential (F= 92.337, p value < 0.05) and Cobalt Hexacyanoferrate : Nano Silver Powder (F= 96.248, p value < 0.05) were significant on the sensitivity. The pH value of phosphate solution (F= 0.818, p value > 0.05) was not significant on the sensitivity. The results of experimental design showed that the optimum operating conditions for this study were operating potential = -200 mV, the optimum ratio was Cobalt Hexacyanoferrate : Carbon Powder : Carbon Paste : Nano Silver Powder = 3：7：10：2, and the pH value of phosphate solution = 7.4. At the optimum operating conditions, and at 30 ℃, stirring rate = 700 rpm, the detection limit was 0.06 mM H2O2, the linear range was 0.06 ~ 4.0 mM H2O2, R2 = 0.9976 and the sensitivity was 356.65 μA / cm2．mM H2O2.
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