| Summary: | 碩士 === 國立臺北科技大學 === 化學工程與生物科技系化學工程博士班 === 105 === PartI: We have described a multiwalled carbon nanotube (MWCNT) supported [Cu(sal-ala)bpy] (sal-ala = salicylalanine-alanine, bpy = 2, 2’-bipyridine) inorganic nanocomposite was successfully prepared and applied for the selective detection of dopamine (DA). The prepared nanocomposite was characterized by the SEM, EIS, UV-Vis, XRD and FT-IR studies. Moreover, the electrochemical response of the nanocomposite was investigated by the CV, i-t and DPV techniques. The MWCNT/[Cu(sal-ala)bpy]/GCE exhibited an enhanced electrochemical response towards the detection of DA with high current response and less oxidation potential. On the other hand, the electrocatalytic performance of the modified electrode shows the linear response range from 0.1 to 300 μM, with the detection limit of 0.16 µM and the sensitivity was 2.3455 μA μM-1 cm-2. In addition, the MWCNT/[Cu(sal-ala)bpy]/GCE electrode had excellent stability, repeatability and reproducibility towards the detection of DA.
PartII: This part deals with the simultaneous electrochemical deposition of gold and palladium nanoparticles on graphene flakes (Au/PdNPs-GRF) for the sensitive determination of caffeic acid (CA). The enhanced electrochemical determination of CA at Au/PdNPs-GRF were studied by using cyclic voltammetry and differential pulse voltammetry. In results, Au/PdNPs-GRF electrode exhibited an excellent electrocatalytic activity towards CA with wide linear range and low limit of detection of 0.03 - 938.97 µM and 6 nM, respectively. Eventually, the Au/PdNPs-GRF was found as a selective and stable active material for the sensing of CA.
PartIII: The activated screen printed carbon electrode (ASPCE) was fabricated by simple electrochemical technique. ASPCE exhibited an excellent electrocatalytic activity in terms of decrease the potential and increase the anodic peak current for the detection of GA when compared to bare SPCE. The ASPCE was successfully determined the GA and it showed good wide linear response range from 0.01 to 1799.6 µM and the lowest detection limit (LOD) of 0.031 µM. The sensor was applied to the determination of GA in real samples, where it shows good recovery and accuracy.
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