The preparation and stabilization of gold nanoparticles with a precise control of size and dispersion is highly attractive for a variety of applications, and a key aspect is thermal stability of the nanoparticles. This paper focuses on understanding the effect of TiO₂-based nanodomains, dispersed on mesoporous silicas, and how they control gold nanoparticle stability. The anatase domains have been incorporated through two different strategies: co-hydrolysis of Si and Ti reagents that directly form the mesoporous material through self-assembling with surfactant micelles, or the post-impregnation of the mesosporous silica with Ti(acac)₂. Both strategies lead to different incorporation of the anatase domains: partially embedded inside the silica walls, or occupying the mesopores. We have observed that the inclusion in the pores favors the stability of the final material due to a more favorable gold-support interaction and also due to a stabilizing effect associated with a scaffold effect of the anatase crystals, which hinders the collapse of the mesostructure.

精确控制尺寸和分散度的金纳米颗粒的制备和稳定化在各种应用中具有很高的吸引力，并且关键方面是纳米颗粒的热稳定性。本文着重于了解分散在介孔二氧化硅上的基于TiO ₂的纳米域的作用，以及它们如何控制金纳米颗粒的稳定性。锐钛矿结构域已通过两种不同的策略引入：通过表面活性剂胶束的自组装直接水解直接形成介孔材料的Si和Ti试剂共水解，或用Ti（acac）₂对介孔二氧化硅进行后浸渍。两种策略均导致锐钛矿结构域的掺入不同：部分嵌入二氧化硅壁内部或占据中孔。我们已经观察到，由于更有利的金-载体相互作用并且还由于与锐钛矿晶体的支架作用相关的稳定化作用而阻碍了介孔结构的塌陷，因此包含在孔中有利于最终材料的稳定性。