Electrochemiluminecence Performances Of Tin-based Nanomaterials

Electrochemiluminescence(ECL),which combines the advantages of chemiluminescence and electrochemical methods,has received considerable interest and been widely used in biological and chemical analysis.Organic luminol and inorganic ruthenium complexe were the most popular systems in the traditional electroluminescent researches.In recent years,due to the unique physicochemical properties of the nanomaterials,many researchers have made great efforts to investigate their application in ECL.Among them,tin-based nanomaterial is one of important classes due to its advantages such as non-toxic,pollution-free and good conductivity and so on.However,few investigations on the ECL performances of tin-based nanomaterials have been reported.In this thesis,three typical tin-based nanomaterials were synthesized by simple method.Furthermore,the as-prepared samples have been applied in ECL.The primary research contents and conclusions are as follows:(1)SnO2/rGO(reduced graphene oxide)nanocomposites with different ratios of rGO were successfully synthesized using SnCl4·5H2O and graphene oxide(GO)as precursors.In the ECL experiments,the as-prepared samples exhibited excellent performance using K2S2O8 as coreactant.Among them,SnO2-rGO-1 sample with 1%rGO showed the optimal ECL performance.The ECL intensity of SnO2-rGO-1 was 4.1 times higher than that of pure SnO2.Moreover,a ECL sensor with high sensitivity has also been developed to detect Cr6+ using SnO2-rGO-1.It was found that the response range of Cr6+ was 1-20 mM with a detection limit of 0.01 mM and the sensor also showed a good selectivity for Cr6+(2)2D SnNb2O6 nanosheets were synthesized using Nb2O5·nH2O and SnCl2 as precursors.The as-prepared samples have been applied into the ECL of bipyridine ruthenium(Ru(bpy)32+)system.The roles of the samples in this ECL system was systematically investigated.Results showed the ECL properties of Ru(bpy)32+ could be greatly enhanced using SnNb2O6 nanosheets as sensitizing material.Based on the above phenomenon,a ECL sensor was constructed to detect the concentration of Ru(bpy)32+.It was found that the response range of Ru(bpy)32+ concentration over the sensor was 10-4?10-8 M with a detection limit of 3×10-9 M.(3)2D SnS nanosheets were synthesized by a liquid phase exfoliation through a top-down strategy.The as-prepared SnS nanosheets as sensitizing material were used to enhance the ECL performance of Ru(bpy)32+.The results showed that the ECL intensity of SnS nanosheet/Ru(bpy)32+ system was 140 times higher than that of bulk SnS/Ru(bpy)32+system.This may be attributed to the effective adsorption of Ru(bpy)32+ on SnS nanosheets,the strong interaction between Ru(bpy)32+ and SnS nanosheets via chemical bonds,and the easily electron transfer.The novel result of this work includes:(1)The ECL performance of SnO2/rGO nanocomposite was investigated for the first time and a ECL sensor was constructed based on it and was used to detect Cr6+.(2):It is the first time that SnNb2O6 nanosheets and SnS nanosheets were used as sensitizing material in Ru(bpy)32+systemand the ECL performance of Ru(bpy)32+were greatly enhanced.Finally,the applications of tin-based nanomaterials were extended.