Fabrication Of Nano-structured Electrodes And Their Applications In Electrochemical Sensing

Nano-materials, with sizes in the range of 0.1-100 nm, because of their unique architecture and remarkable electrical properties, are widely used in electrochemistry and electroanlytical chemistry, especially in the preparation and application of chemically modified electrode (CME). In this paper, several nano-structred electrodes were fabricated based on the especial properties of nano-materials, and successfully applied to environmental endocrine disrupting chemicals and pharmaic analysis analysis and studies on kinetics of electrochemical process. The results confirm that nano-interfaces play important roles in electroanalyticl chemistry. The focus of this paper has been listed as follows:1. The electroanalytical behaviors of the endocrine-disrupting chemical trifluralin have been studied at a nanostructuring electrode firstly. The nanostructuring electrode was fabricated by coating a uniform multi-wall carbon nanotubes (MWNTs) film on glassy carbon electrode (GCE). The reduction peak currents of trifluralin increased remarkably and the reduction peak potential shifted positively at the MWNTs film modified GCE, compared with that at a bare GCE. The results showed that this nanostructuring electrode exhibited excellent enhancement effects on the electrochemical reduction of trifluralin. Consequently, a simple and sensitive electroanalytical method was developed for the determination of trifluralin.2. A convenient and sensitive electrochemical method is described for the determination of hesperidin based on the unique properties of a single-wall carbon nanotubes (SWNTs) thin film firstly. The electrochemical behavior of hesperidin at the SWNTs film-coated glassy carbon electrode (GCE) was investigated in detail, showing that the SWNTs-coated GCE exhibits electrocatalytic activity to the electrochemical behavior of hesperidin. The experimental parameters, which influence the current of hesperidin, were optimized.3. The voltammetric behaviour of hesperidin was investigated by linear sweep voltammetry and cyclic voltammetry at platinum nanoparticle/MWNTs nanocomposites of glassy carbon electrodes. Compared with the bare GC electrode and MWNTs film modified GC electrode, the peak currents at the MWNTs/Ptnano composite film modified GC electrode was enhanced greatly. The experimental parameters were optimized. The method has been applied successfully to the determination of hesperidin in Chinese crude drugs.4. Platinum nanoparticles (Ptnano) were prepared and used in combination with single-wall carbon nanotubes (SWNTs) for fabricating electrochemical sensors with remarkably improved sensitivity toward diethylstilbestrol (DES). The glassy carbon (GC) electrode modified with SWNTs/Ptnano composite film exhibited excellent electrochemical behaviors toward the redox of DES. Compared with the bare GC electrode and SWNTs film modified GC electrode, the redox peak currents at the SWNTs/Ptnano composite film modified GC electrode was enhanced greatly. The experimental parameters, which influence the current of DES, were optimized.