Nanomaterials Gold Of Solution Phase Controlled Preparation And Analysis Applied Research

In this thesis, Au nanorods were prepared by cobalt nanoparticles method andseedless method, respectively. And Au@Pt core-shell structured nanoparticles weresynthesized using distillation method. Further, flower-shaped nanostructures （FGNs）which can mimic the catalytic activity of peroxidase were achieved with graphemeoxide sheet as the template. Its catalytic activity was evaluated by the electrochemicalreduction of H₂O₂and oxidation of glucose, respectively. The main contents are listedbelow:（1） For the synthesis of Au nanorods, Au nanoparticles were firstly replaced bycobalt nanoparticles as seeds in the growth solution. The factors which influenced thelength-diameter ratio of Au nanorods, such as the species of cobalt nanoparticles madein different surfactants, the concentration of cobalt nanoparticles, the concentration ofAgNO₃and temperature, were investigated in detail. Further, by changing theconcentration of ascorbic acid, dog-bone shaped Au nanorods was synthesized.（2） For synthesis of Au nanorods by seedless method, without Au nanoparticleswas tried to put into the growth solution. The effects of the concentration of NaBH₄and AgNO₃and temperature on the length-diameter ratio of the Au nanonords werealso investigated in detail. Based on the same method, Au nanocubes were alsoprepared. The concentration of NaBH₄, the purity of the surfactant and theconcentration of ascorbic acid have significant effects on the particle size of Aunanocubes. Au nonorods@Pt and Au nanocubes@Pt core-shell nanostructuredmaterials were synthesized by deposition of platinum nanoparticles on the surfaces ofAu nanorods and Au nanocubes through distillation method, respectively. Theconcentration of ascitric acid on the morphology of core-shell structured materials wasinvestigated in detail.（3） With graphene oxide （GO） as template and NH₂OH·HCl as reduced agent,AuCl₄^–was reduced by GO to form flower-shaped gold nanostructures （FGNs）. FGN’smorphology, size can be controlled by regulating some forces. FGNs can mimic thecatalytic activities of horseradish peroxidase and glucose oxidase, and FGNs weresuccessfully employed to electrochemically detect H₂O₂and glucose, respectively. Ingeneral, the enzyme activity is lost after exposure to extremes of pH and high temperature. However, FGNs’s enzyme mimetics can realize the catalytic.