Research On Preparation And Application Of Palladium Nanomaterials Supported By Graphene Quantum Dots And Silicon Quantum Dots

Chapter 1:Introduction. The characters, preparation methods, functionalized methods and characterization methods of quantum dots were introduced in this chapter. Then, the production and application of graphene quantum dots and silicon quantum dots have been summarized. Meanwhile, the noble metal palladium nanomaterials were described. Finally, the background, the research content and innovation points of this paper have been introduced.Chapter 2:The preparation and applications of graphene quantum dots (GQDs). The graphene quantum dots were prepared, which were based on citric acid and NaOH at high temprature. And then graphene quantum dots were decorated by combining with 1,6-hexamethylenediamine, using EDS and NHS as the crosslinking agent. Then spectral properties of the amino functioned quantum dots was characterized by UV-visible absorption spectra and fluorescence spectra. The fluorescence intensity of GQDs and the concention of hydroquinone exhibited a good linear relationship with a wide concentrations range of 1.0×10-7～5.0×10-6 mol/L as well as the limit of detection was calculated to be 4.2×10-9 mol/L.Chapter 3:The preparation and applications of GQDs supported palladium nanomaterials (GQDs/Pd). Using the amino functional graphene quantum dots as support materials, GQDs/Pd nanocomposites were prepared. The nanocomposites had been characterized by FTIR, TEM and CVs. Formic acid was detected by this material with electrochemical method, the oxidation peak current with the concentration of formic acid had a linear relationship with a wide concentrations range of 3×10-3～10-2 mol/L. The linear equation for:Ip(A)=3×10-5+0.0696 C (mol/L).Chapter 4:In this chapter, a simple solution-phase synthesis of silicon quantum dots (SiQDs) was described. The property of the SiQDs was characterized by using FTIR, UV-visible absorption spectra and fluorescence spectra. The morphology was characterized by TEM. The photoluminescence quantum yield of silicon quantum dots was 10.06%. The fluorescent lifetime were τ1=3.1982 ns, τ2=12.4527 ns.Chapter 5:The applications of SiQDs and SiQDs/Pd nanomaterials. The controllable preparation of palladium nanoparticles supported by SiQDs was firstly prepared based on SiQDs. The palladium nanomaterials have potential applications in the fields of organic catalysis and energy conversion. Then, silicon quantum dots modified allylamine was applied for the determination of glucose with the linear range of 1.0×104～6.0×103 mol/L.Chapter 6:Conclusions and outlook. The completed work has been summarized in this chapter, simultaneously, the next step was planning.