| Summary: | 碩士 === 逢甲大學 === 化學工程學系 === 106 === In this study, electrospinning technology was used to prepare palladium and gold nanoparticles modified nano carbon fiber for chemical sensors. Electrochemical analysis was used to investigate the electrochemical properties and sensing properties of Pd(C)/CNF/CP (Carbon paper), Pd-CNF/GCE, Au-CNF/GCE electrodes. Pd(C)/CNF/CP electrodes are used to sense oxygen and sulfur dioxide, while Pd-CNF/GCE and Au-CNF/GCE electrodes are sensitive to ascorbic acid (AA) and acetaminophen (ACT). The results show that the Pd(C)/C¬NF/CP electrode sensing potentials of oxygen and sulfur dioxide are -0.2 V and 0.8 V（vs. Ag/AgCl）, respectively. The detection O2 concentration ranges from 100 to 1000 ppm, and the detection SO2 concentration range is from 60 to 600 ppm, both gas concentrations and detection current values showed a good linear relationship. The O2 sensitivity was 2.34 μA cm-2 ppm-1, and the SO2 sensitivity was 4.75 μA cm-2 ppm-1. The Pd-CNF/GCE and Au-CNF/GCE electrodes can detect AA and ACT, and the detection concentration range from 0.568 ~ 5.11 mM. The sensing the potential of AA and ACT by Pd-CNF/GCE electrode, which are 0.5 V and 0.6 V (vs. Ag/AgCl) . there is a fast response time and detection limit of AA 12 ppm (68 μM) and sensitivity is 121.81 μA cm-2 mM-1；The ACT detection limit is 20 ppm (113.54 μM) and the sensitivity is 85.53 μA cm-2 mM-1. The senseing potential of AA and ACT by wsing Au-CNF/GCE electrodes are 0.3 V and 0.6 V （vs. Ag/AgCl）, respectively.The Au-CNF/GCE electrode sensing AA and ACT have better overall sensitivity than that of the Pd-CNF/GCE electrode. Especially for the sensing AA, the selectivity is not easy to be interfered by ACT or any species UA、H2O2、glucose, the sensitivity is 175.89 μA cm-2 mM-1, ACT is 160.46 μA cm-2 mM-1. Respectively, The detector has good response time, high selectivity and high sensitivity.
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