To synthesize nanoparticles for catalytic applications, pulsed laser ablation (PLA) in liquids has been established as a cost-effective method complementary to wet-chemical synthesis routes. Due to mass transport limitations in water, recent studies conducted PLA in supercritical CO₂ (scCO₂) to use the superior transport properties. Unfortunately, PLA in scCO₂ so far led to the formation of bigger particles and agglomerates, which are unfavorable for the application as catalytically active material. As will be shown in this paper, the former are being avoided by means of an in-situ deposition approach of gold and platinum in scCO₂ in presence of mesoporous γ-Al₂O₃ support. Transmission electron microscopy reveals that the resulting nanoparticle size is quenched while careful adjustment of the mixing conditions during PLA is shown to significantly influence the agglomeration tendency. Cross-sections of the heterogeneous catalyst prove, that the nanoparticles penetrate the mesoporous support up to 109 nm deep.

为了合成用于催化应用的纳米颗粒，液体中的脉冲激光烧蚀（PLA）已被确立为一种与湿化学合成路线互补的经济有效的方法。由于水中的大众运输限制，最近的研究在超临界CO ₂（scCO ₂）中进行了PLA的研究，以利用其优越的运输性能。不幸的是，到目前为止，scCO _2中的PLA导致形成较大的颗粒和团聚物，这不利于用作催化活性材料。如将在本文中示出的，前者目前由的装置避免在原位的金和铂中SCCO沉积方法₂中孔的存在的γ-Al ₂ ö ₃支持。透射电子显微镜显示，所得纳米颗粒的尺寸被淬灭，而在PLA期间对混合条件的仔细调节显示出显着影响团聚趋势。非均相催化剂的横截面证明，纳米颗粒可穿透中孔载体，最大深度为109 nm。