| Summary: | 碩士 === 國立中興大學 === 化學系所 === 102 === In this study, we developed diverse electrochemical sensors based on electrodeposited various catalytic metal nanoparticles on a screen-printed edge band carbon ultramicroelectrode (SPUME) with Nafion as the solid polymer electrolyte. Uniform and well-dispersed metal-nanoparticles are well deposited on the SPUME without either protective or capped agents due to the edge diffusion effect at the SPUME. First part of this study was the development of portable gaseous formaldehyde amperometric sensor using the NPtRu-SPUME. The role of Ru was to protect the Pt from the poison of absorption of carbon monoxide. This developed gas sensing method for determination of formaldehyde showed a wide linear range from 25.4 ppb to 3.68 ppm, a very low detection limit of 1.42 ppb (S/N = 3) and excellent selectivity. Second, glycerol sensor based on the gaseous formaldehyde sensor has developed. The concentration of glycerol was determined indirectly by reacting glycerol with periodate to produce formaldehyde and formic acid. We used NAu-PtRu-SPUME here to dramatically enhance the sensitivity of glycerol determination. The developed method was successfully applied to identify the purity of glycerol in biodiesel. Overall, the glycerol sensor was found to be extremely highly sensitive and selective. Finally, we used lipase to indirectly quantified triglyceride concentration by glycerol sensing method.
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