Deposition of Au nanoparticles into mesoporous SiO2 SBA-15

Huerta, Andrea; Torralvo Fernández, María Josefa; Tenorio, María José; Pérez Velilla, Eduardo; Bermúdez, Jonathan; Calvo Garrido, María Lourdes; Cabañas Poveda, Albertina

Deposition of Au nanoparticles into mesoporous SiO2 SBA-15

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Official URL

https://www.doi.org/10.1016/j.supflu.2022.105582

Publication date

2022

Authors

Huerta, Andrea

Torralvo Fernández, María Josefa

Tenorio, María José

Pérez Velilla, Eduardo

Bermúdez, Jonathan

Calvo Garrido, María Lourdes

Cabañas Poveda, Albertina

Publisher

Elsevier

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URI

https://hdl.handle.net/20.500.14352/96377

Citation

Huerta, Andrea, et al. «Deposition of Au Nanoparticles into Mesoporous SiO2 SBA-15». The Journal of Supercritical Fluids, vol. 184, mayo de 2022, p. 105582. https://doi.org/10.1016/j.supflu.2022.105582.

Abstract

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 °C to remove the organic matter and promote particle growth. Materials prepared on the highest thiol grafting density support showed Au NP between 2.5 and 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.