Operational Stability Enhancement of a Hydrogen Peroxide Sensor Based on Prussian Blue Fabricated through Inkjet Process

• Main Authors: Yu-Ping Lin, 林育平
• Other Authors: Ting-Chih Liao
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/15932913987861195739

碩士 === 國立臺灣大學 === 化學工程學研究所 === 100 === In this study, Prussian blue was deposited on carbon paste electrode by inkjet printing technique. But Prussian blue has very low stability with neutral and alkaline pH. Therefore, the result will confine the development of hydrogen peroxide sensors based on Prussian blue. In order to improve stability of Prussian blue for fabrication of hydrogen peroxide sensors that have high stability and well performance, and then the hydrogen peroxide sensors can apply in microelectrode system and combine with different oxidases to get a multicomponent-sensing device. Therefore, different amount of protective materials were deposited onto the Prussian blue modified electrode through inkjet process. Then, the electrodes were investigated to understand the protective mechanisms of protective materials. The preparation of inks applied for inkjet process will base on the mechanisms for fabricating hydrogen peroxide sensors that have high stability and well performance more simply. Protective materials, such as cellulose acetate and paraffin wax, were deposited on Prussian modified electrode by inkjet printing technique. And the stability of Prussian blue operated at pH 7.4 was investigated. After 10 times paraffin wax deposition onto Prussian blue modified electrode and then heating process, the peak current of the twentieth cycle had no obvious decrease. And for hydrogen peroxide detection, the electrode had sensitivity of 0.826 mA/M/cm2, detection limit of 0.62 mM and linear range between 2.65 to 8.46 mM. And under the same operation condition, Prussian blue modified electrode with 5 times cellulose acetate deposition had sensitivity of 2.56 mA/M/cm2, detection limit of 0.1 mM and linear range between 0.15 to 2.61 mM. The peak current of the twentieth cycle had declined by 4.4 percent. It was found that the stability of Prussian blue particles, which were entirely coated with paraffin wax or cellulose acetate, had enhanced sufficiently. When the ratio of oxidized carbon black in the deposited layer increased, the capacitance of the electrode had also increased. When the proportion of wax or cellulose acetate in the deposited layer increased, the mass transfer resistance of ions through the layer had also increased. The results show the optimum ratio of Prussian blue to protective materials is 1 to 1, and the ratio of oxidized carbon black to Prussian blue is better in 0.5: 1 to 1: 1