Deposition of Au nanoparticles into mesoporous SiO2 SBA-15



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Huerta, Andrea and Torralvo Fernández, María José and Tenorio, María José and Pérez Gómez, Eduardo and Bermúdez, Jonathan and Calvo Garrido, Lourdes and Cabañas Poveda, Albertina (2022) Deposition of Au nanoparticles into mesoporous SiO2 SBA-15. The Journal of Supercritical Fluids, 184 . ISSN 0896-8446

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Au/SiO2 SBA-15 materials were prepared using supercritical CO2 (scCO2) and by wet impregnation. First, SiO2 SBA-15 was functionalized with thiol groups at different grafting densities using 3-(Mercaptopropyl)trimethoxysilane dissolved in scCO2. The support was then impregnated with HAuCl4·3H2O in scCO2 modified with EtOH. Wet impregnation of the supports with HAuCl4·3H2O in ethanol was also performed. Materials were calcined at 500 ºC to remove the organic matter and promote particle growth. Materials prepared on the highest thiol grafting density support showed Au NP between 2.5-5 nm homogeneously distributed within the mesopores. Slightly larger Au NPs were obtained in scCO2 modified with EtOH. Materials prepared on the low thiol grafting density support showed a bimodal particle size distribution with particles up to 7 nm located inside the mesopores and larger ones of 10-20 nm on the external surface. A possible reaction mechanism was proposed. These materials can be used in catalysis, sensing and biomedicine.

Item Type:Article
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CRUE-CSIC (Acuerdos Transformativos 2022)

Uncontrolled Keywords:Supercritical CO2, Gold Nanoparticles, Mesoporous SiO2, Surface modification, Catalysis, Drug delivery
Subjects:Sciences > Physics > Materials
Sciences > Physics > Chemistry, Physical and theoretical
Sciences > Chemistry
Sciences > Chemistry > Chemical engineering
Medical sciences > Pharmacy
Medical sciences > Pharmacy > Physical chemistry
ID Code:71476
Deposited On:29 Mar 2022 13:19
Last Modified:05 May 2022 07:43

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