This paper describes the synthesis of gold nanoparticles on the surface of two types of silica matrices, the disordered mesoporous silica (DMS) and SBA-15, which are chemically functionalized with pyridinium ligand. The adsorption of AuCl₄⁻ occurred through the ion exchange method. The gold nanoparticles were synthesized through the reduction of the adsorbed Au ions on the surface of silica matrices. The silica surface was functionalized with 3-n-propylpyridinium chloride trimethoxysilane, and it was confirmed through ²⁹Si and ¹³C solid-state CP/MAS NMR. Then, gold nanoparticles were in situ synthesized in the hybrid material surface. The DMS-PyClAuX materials exhibited spherical nanoparticles with a maximum average size of 9.6 nm when the highest gold concentration (2.08 wt%) was used. The SBA-PyClAuX materials showed nanoparticles with a maximum average size of 5.5 nm. By comparing the standard deviations observed in the materials of both matrices, we observed that the SBA-15 matrix presented better control of the nanoparticle diameter.

Graphical abstract

本文介绍了在两种类型的二氧化硅基质（无序介孔二氧化硅（DMS）和SBA-15）的表面上金纳米颗粒的合成，它们用吡啶鎓配体进行了化学官能化。AUCL的吸附₄ ^-发生通过离子交换方法。通过还原二氧化硅基质表面上吸附的金离子来合成金纳米颗粒。用3-正丙基氯化吡啶鎓三甲氧基硅烷对二氧化硅表面进行功能化，并通过²⁹ Si和¹³确证C固态CP / MAS NMR。然后，在杂化材料表面原位合成金纳米颗粒。当使用最高的金浓度（2.08 wt％）时，DMS-PyClAuX材料显示出球形纳米颗粒，其最大平均尺寸为9.6 nm。SBA-PyClAuX材料显示出最大平均粒径为5.5 nm的纳米颗粒。通过比较两种基质材料中观察到的标准偏差，我们观察到SBA-15基质表现出对纳米颗粒直径的更好控制。

图形概要