The Electrochemical Synthesis And Application Of Some Functional Materials With Luminescence

Recently, the electrochemical synthesis has become a emerging technique forthe preparation of functional materials with luminescence, since the technique hasseveral obvious advantages: Electrochemical synthesis is a low-temperature technique;experiments are simple to perform and the instruments are inexpensive; and the shapeand function of materials can be controlled by the choice of reaction parameters.Therefore, in the thesis, study was focused on employing the electrochemical methodto synthetize functionalised materials, such as ionic liquids and ZnO quantum dots.The thesis is divided into four chapters.In chapter1, introduction on ionic liquids(ILs), functional method for ILs andtheir applications in chemical sensors was given; the nature of quantum dots,preparation methods and their applications were mentioned; then the concept ofelectrochemical synthesis and its applications were introduced; finally, the purpose ofthis thesis was described.In chapter2, the electrochemical functionalization of1-Butyl-3-methylimidazolium hexafluorophosphate IL was carried out. The effects ofapplied potential window, electrolysis time and dissolved oxygen in solvent wereinvestigated. The functionalized IL exhibited good fluorescence property and wasused to construct a new aniline sensor. The aniline fluorescence sensor has a detectionlimit of1.0×10-6mol/L, and a linear response range of4.0×10-2～1.0×10-5mol/L.In chapter3, functionalized1-Butyl-3-methylimidazolium chloride IL waselectrochemically synthesized. The effects of applied potential window andelectrolysis time were investigated. The functionalized IL was found to be a goodcoreactant for Ru(bpy)32+ECL system. The ECL of the functionalised IL-Ru(bpy)32+co-reactant system could be quenched by a free chlorine can, on the basis of which anew type of ECL sensor for free chlorine sensor was developed. There was a goodlinear relationship between ECL intenisty and the concentration of free chlorine in therange of1.0×10-3～5.0×10-9mol/L.The detection limit of free chlorine was2.5×10-9mol/L. In chapter4, a simple electrochemical etch method for the synthesis of ZnOquantum dots was presented. The effects of electrolyte concentration, appliedpotential window, amount of water, dissolved oxygen in DMF and electrolysis timewere investigated. The electrochemically prepared ZnO QDs exhibited goodfluorescence activity. In addition, the ZnO QDs had good electrochemiluminescenceactivity. The ECL behaviors and mechanism of ZnO QDs-S2O82-system werestudied and discussed in detail.