| Chemically modified electrode (CME) is very active research area in electrochemistry, and it is widely applied in many cases such as life,environmental, analytic and material science. The preparation of CMEs is the key step and essential content to open research in this area. Among many preparation methods of CMEs, electrospinning has been paid much attention recently due to its simple and clean production process, easy control shape and high surface area of nanomaterials. So,the thesis aims at the preparation and properties of the modified electrodes by electrospinning.The results of the thesis are as following:Palladium nanoparticle (NPs) modified indium tin oxide (ITO) electrode was fabri-cated under suitable conditions. The collected time and calcination temperature were opti-mized. Scanning electron microscopy (SEM) images and X-ray photoelectron spectroscopy (XPS) spectra indicated Pd NPs were successfully immobilized at ITO electrode. The elec-trochemical behavior of PdNPs/ITO can be adjusted easily by changing the electrospun time. PdNPs/ITO exhibited high sensitivity,good reproducibility and stability for NO2-in simulated and real water samples. The current responses were linear with NO2-concentra-tion in a wide range and low limit of detection (LOD).Carbon nanofibers (CNFs) modified ITO electrode was fabricated by electrospinning followed by thermal treatment. The modified electrode was characterized by SEM and XPS. Similarly,the prepared electrodes exhibited high sensitivity,good reproducibility and stability for NO2-,and it also can be used to sense NO2-in real water samples.Electrospinning was also used to fabricate of microelectrode array (MEA). Pd NPs and Pd NPs-loaded CNFs modified ITO electrode was prepared by electrospinning fol-lowed by thermal treatment under nitrogen protection conditions and direct calcination in air,respectively. SEM,atomic force microscope (AFM) indicated successful fabrication of the modified electrode. The electrochemical behavior of MEA is similar with the Pt micro-electrode at25μm,however the signal is much higher than a single microelectrode,when used in the detection of NO2with low LOD. |
