Facile preparation of small-sized gold nanoparticle decorated silica nanocomposites and their morphological changes in catalytic reactions

作者：Jinhui Qi, Haichun Zhou, Junqi Tang · 发表于：Nanotechnology · 年份：2023 · DOI：10.1088/1361-6528/ad15bc · 被引用次数：6 · 研究领域：Nanomaterials for catalytic reactions、Catalytic Processes in Materials Science、Copper-based nanomaterials and applications

Abstract Due to the unique physicochemical properties of gold nanoparticles (AuNPs) decorated silica nanostructures (SiO 2 @AuNPs), they show great potential for applications in catalysis, biosensing, optical devices and medicine. It is essential to explore the catalytic effect of SiO 2 @AuNPs and the understanding of the essential process of catalytic reactions. We have prepared SiO 2 @AuNPs by loading small-sized AuNPs on surface-modified silica nanospheres. SiO 2 @AuNPs was used as a catalyst for the catalytic reduction of 4-nitrophenol (4-NP) in the presence of excess NaBH 4 , and the results showed that with the increase of the amount of catalyst from 30 to 100 μ l, the corresponding rate constant K app was increased from 6.44 × 10 −3 to 1.45 × 10 −2 s −1 , and its TOF was as high as 1.326 × 10 3 h −1 , and the catalytic rate could still be maintained at 87% after five cycles. By analyzing the morphology and size of the SiO 2 supported AuNPs before and after the catalytic reaction, it can be seen that the atoms on the surface of small-sized AuNPs supported by silica have migrated during the catalytic process, which subsequently affects the catalytic efficiency of the structure. This study proves the good catalytic effect of SiO 2 @AuNPs structure and lays the foundation for its wider application.