PREPARATION OF GOLD NANOPARTICLES USING VANILLIN
DOI:
https://doi.org/10.32782/naturaljournal.8.2024.15Keywords:
nanoparticles, gold, vanillin, stoichiometry, mechanismAbstract
Gold nanoparticles are an interesting object of nanotechnology due to prospects of their application in industry and medicine. The peculiarities of the process of obtaining gold nanoparticles in the reaction of reduction of HAuCl4 with the natural aromatic aldehyde vanillin were studied. In this process, vanillin acts as a reducer of Au3+ ions and a stabilizer of formed gold nanoparticles. A method of purification and concentration of gold hydrosol by the ion exchange method is proposed. A comprehensive study of the properties of the obtained gold nanoparticles was carried out. Spectrophotometric studies showed the presence of a maximum at 530 nm in the absorption spectrum, which is caused by the phenomenon of surface plasmon resonance. Using the X-ray diffraction method, it was established that the obtained nanoparticles have an fcc lattice with an average crystallite diameter of 35 nm. The method of transmission electron microscopy showed that the obtained nanoparticles have a spherical shape with a size in the range from 10 to 45 nm. The electrochemical behavior of the obtained gold nanoparticles was investigated by the method of cyclic voltammetry. The stoichiometry of the total process in the system containing vanillin, hydrogen tetrachloroaurate and sodium hydroxide was established, which is 3:4:16. A hypothetical model of the process of formation of primary clusters of gold (Au4) is proposed, which satisfies the experimental data. The obtained results indicate the perspective of further research of gold nanoparticles obtained using vanillin, in connection with the possibility of their use in various fields of science and technology.
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