| Through a certain method of modification of gold nanomaterials to make its have certainelectrochemical properties and spectral analysis is called the functionalization of goldnanomaterials. In this paper, we study the electrochemical method by preparation of differentmorphology of gold nanostructures modified by small molecules or ions and using goldnanomaterials to modify electrodes and study its electric catalytic properties and potentialapplications in fuel cell. Spectral analysis refers to test samples by gold nanoparticles whichare modified through imply specific functional groups through chemical or physical means ofmodification on the surface. It said that gold nanoparticles as body, through small molecularregulation or surface modification, make its have certain electrochemical and photochemicalproperties. This article through studies the synthesis of gold nanoparticles modified electrodesand electrochemical catalytic properties and small molecule modification optical properties ofgold nanoparticles and its target recognition launched a series of work. Mainly includes thefollowing four aspects:1. Fe3+assisted synthesis of sea-urchin AuNPs arraysWith specific metal ions and small molecules in solution can well control themorphology of AuNPs. In this experiment, we prepared sea-urchin AuNPs arrays by one stepelectrodeposition method through Fe3+as the catalyst and growth oriented mediation. Surfacefeatures and the crystal structure of sea-urchin AuNPs were charactered by the methods ofSEM, TEM and XRD respectively. In addition, the prepared sea urchin gold nanoparticlesshow good catalytic activity to ethylene glycol and glycerol and have a broad prospect ofapplication in fuel cells.2. Prepared dendritic gold nanoparticles by one step electrodeposition and their electriccatalytic on ethanolDendritic gold nanostructures were prepared through a simple, rapid and one-potelectrodeposition with the help of L-arginine. The as-prepared Au deposits were characterizedby SEM, TEM, and XRD. It was found that the experimental conditions including Depositionpotential, the concentrations of HAuCl4, L-arginine, and deposition time played importantroles in the synthesis of dendritic gold nanostructures. Based on the experimental results, apossible growth mechanism of dendritic gold nanostructures was proposed. The as-synthesized dendritic gold nanostructures displayed good stability and excellentelectrocatalytic activity toward the oxidation of ethylene glycol (EG) in acidic media.3. Functionalized gold nanoparticles (OA-Au NPs) recognize dopamine with highefficiencyIn our work, the synthesis of functionalized gold nanoparticles based on cysteamine asintermediary agent, orotic acid was introduced to identify the target molecules, by UV-visspectrophotometer inspecting the ability of dopamine detection. This method has highsensitive and good selectivity, the detection limit is3.0μm under condition of23other smallsoluble organic molecules in water. In the addition, in the actual samples test, specificity oftrace detection of dopamine content in human serum has been implemented.4. Colorimetric Detection of Chromium (III) in aqueous solution by modified goldnanparticlesThe AuNPs were prepared by citrate-mediated reduction of HAuCl4according toliterature, and then through the ligand-exchange will identify the site where introduce thetiopronin. Tiopronin modified on the surface of gold nanoparticles through Au-S bond.Modified gold nanoparticles have good selectivity and sensitivity on Cr3detection. On thecondition of Cr3+, because with the same charge between colloidal particles, colloidal particlesdistributed uniformly, relatively stable, the color of solution is wine red,,when present Cr3+,Cr3+and AuNPs through hydrogen bonding, the size of particles increases, the goldnanoparticle aggregation on the influence of gravity. Therefore, the color of the solutionchanges from wine red to blue. This a series of changes record through spectrums, which candevelop an effective approach for Cr3+fast detection. |
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