Analysis Of Characteristics Of Triethanolamine Functionalized Gold Nanoparticles And Silica Nanoparticles Study

Nowadays, nanomaterials have been the focus of modern scientific due to the unique physical properties. Functional nanomaterials are the basis of the study and application of nanomaterials. This thesis reviews the nature of gold nanoparticles, preparation methods, application in analytical chemistry and significance and methods of functionalization of gold nanoparticles. Analytical method for metal ions was established based on triethanolamine functional gold nanoparticles and silica nanoparticles. The thesis includes the following parts:1. Colorimetric method based on triethanolamine functional gold nanoparticles.It was found that, after cysteine and thioglycolic acid were immobilized on the surface of gold nanoparticles with the thiol-Au chemistry, calcium ion could rapidly induce aggregation of the functional gold nanoparticles based on complex effect of calcium ion with amino and carboxyl groups in the immobilized cysteine molecules. At the same time, it was also found that triethanolamine could obviously enhance the sensitivity of calcium ion based on decreasing the electrostatic repulsion force between the interparticle gold nanoparticles. Thereafter, the Transmission Electron Microscopy, electrophoresis technique and absorption spectrum method, were used to investigate the sensing mechanism of the functional gold part les for calcium ion. Under the optimum experiment condition, the cysteine-thioglycolic acid-triethanolamine modified gold nanoparticles were highly sensitive (the detection limit was 3.0×10-7 mol·L-1) and selective toward calcium and magnesium ions, with a linear detection range from 1.0×10-6 mol·L-1 to 1.4×10-5 mol·L-1. Based on these findings, a rapid, simple and selective colorimetric method for assaying the hardness in tap water was developed.2. The fabrication of Copper Ions fluorescence nanosensor with Triethanolamine Functionalizing Ru(bpy)32+-doped Silica Nanoparticles.It was found that triethanolamine could be adsorbed on the surface of Ru(bpy)32+-doped SiO2 nanoparticles based on electrostatic interaction of triethanolamine with silica nanoparticles. Then, based on the complex effect between copper ions and triethanolamine as well as the quenching effect of copper ions for doped state Ru(bpy)32+, a fluorescence nanosensor for copper ions was developed. Under the optimum experiment condition, the detection limit of the nanosensor for copper ions was 2.0×10-6 mol·L-1 and the response dynamic range was from 6.0×10-6 mol·L-1 to 1.0×10-4 mol·L-1.