A facile approach is proposed for the stabilization of gold nanoparticles within alumina matrix based on fast coprecipitation of colloidal gold and alumina sol in the supercritical carbon dioxide used as antisolvent. Acetylacetone was used as a stabilizer agent for the synthesis of alumina sol. Gold nanoparticles were synthesized from HAuCl₄ directly in liquid alumina sol in reaction with acetylacetone. Acetylacetone played the role of both a stabilizer agent for gold nanoparticles and a reducing agent. Obtained system is characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared (IR) spectroscopy, and UV–Vis adsorption spectroscopy. The method allows us to synthesize aerogel-like alumina highly loaded with gold nanoparticles firmly fixed on oxide surface and uniformly distributed within alumina matrix. The proposed approach combines sol-gel and supercritical fluid methods for the synthesis and opens the wide prospects for preparation composites consisting of gold nanoparticles in oxide matrix with a uniform distribution. These gold-bearing systems may be of interest to a wide range of applications.

根据胶体金和氧化铝溶胶在用作抗溶剂的超临界二氧化碳中的快速共沉淀，提出了一种用于在氧化铝基质中稳定金纳米颗粒的简便方法。乙酰丙酮用作合成氧化铝溶胶的稳定剂。从HAuCl ₄合成金纳米颗粒直接在液态氧化铝溶胶中与乙酰丙酮反应。乙酰丙酮既是金纳米颗粒的稳定剂又是还原剂。获得的系统的特征在于X射线衍射（XRD），透射电子显微镜（TEM），红外（IR）光谱和UV-Vis吸收光谱。该方法使我们能够合成高度负载金纳米颗粒的气凝胶状氧化铝，所述金纳米颗粒牢固地固定在氧化物表面上并均匀地分布在氧化铝基质中。所提出的方法结合了溶胶-凝胶法和超临界流体方法进行合成，并为制备由金纳米颗粒组成的氧化物基体中具有均匀分布的复合材料开辟了广阔的前景。这些含金系统可能在广泛的应用中引起人们的兴趣。