Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties
Porous silica gel powders, doped with gold nanoparticles (AuNPs), were obtained by heating silica gels containing 1-dodecanethiol and tetrachloroauric acid at temperatures of 450 °C, 700 °C and 900 °C, and characterized using X-ray diffraction, TEM/EDS studies, UV/Vis reflectance spectroscopy and DT...
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2025-06-01
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| author | Nina Danchova Dimitar Shandurkov Roumen Tsekov Luben Mihaylov Tony Spassov Stoyan Gutzov |
| author_facet | Nina Danchova Dimitar Shandurkov Roumen Tsekov Luben Mihaylov Tony Spassov Stoyan Gutzov |
| author_sort | Nina Danchova |
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| description | Porous silica gel powders, doped with gold nanoparticles (AuNPs), were obtained by heating silica gels containing 1-dodecanethiol and tetrachloroauric acid at temperatures of 450 °C, 700 °C and 900 °C, and characterized using X-ray diffraction, TEM/EDS studies, UV/Vis reflectance spectroscopy and DTA/TG investigations. The color and microstructure of the obtained samples with a composition SiO<sub>2</sub>:AuNPs (about 0.03% Au) depend on the heating temperature. The UV/Vis reflection spectra of the samples are explained using Mie’s theory. The thermal stability of the obtained samples, as well as the processes occurring in the sol–gel matrix upon heating, were monitored by DTA/TG. The textural properties of the obtained materials were described based on adsorption–desorption isotherms. The obtained nanocomposites are promising pigments for ceramic glazes, similar to the Purple of Cassius. The textural properties of certain samples, <b>S<sub>BET</sub></b> = 200–350 m<sup>2</sup>/g, a mean pore diameter (<b>D<sub>AV</sub></b>) of approximately 10 nm and a specific pore volume (<b>V<sub>t</sub></b>) between 0.5 and 0.8 cm<sup>3</sup>/g, make them promising candidates for catalytic applications, comparable to aerogel-like materials. |
| format | Article |
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| institution | OA Journals |
| issn | 2310-2861 |
| language | English |
| publishDate | 2025-06-01 |
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| series | Gels |
| spelling | doaj-art-1bd6cf795a974eeeb92b0a988af3d2f52025-08-20T02:21:02ZengMDPI AGGels2310-28612025-06-0111645410.3390/gels11060454Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural PropertiesNina Danchova0Dimitar Shandurkov1Roumen Tsekov2Luben Mihaylov3Tony Spassov4Stoyan Gutzov5Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, J. Bourchier Blvd. 1, 1164 Sofia, BulgariaFaculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, J. Bourchier Blvd. 1, 1164 Sofia, BulgariaFaculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, J. Bourchier Blvd. 1, 1164 Sofia, BulgariaFaculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, J. Bourchier Blvd. 1, 1164 Sofia, BulgariaFaculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, J. Bourchier Blvd. 1, 1164 Sofia, BulgariaFaculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, J. Bourchier Blvd. 1, 1164 Sofia, BulgariaPorous silica gel powders, doped with gold nanoparticles (AuNPs), were obtained by heating silica gels containing 1-dodecanethiol and tetrachloroauric acid at temperatures of 450 °C, 700 °C and 900 °C, and characterized using X-ray diffraction, TEM/EDS studies, UV/Vis reflectance spectroscopy and DTA/TG investigations. The color and microstructure of the obtained samples with a composition SiO<sub>2</sub>:AuNPs (about 0.03% Au) depend on the heating temperature. The UV/Vis reflection spectra of the samples are explained using Mie’s theory. The thermal stability of the obtained samples, as well as the processes occurring in the sol–gel matrix upon heating, were monitored by DTA/TG. The textural properties of the obtained materials were described based on adsorption–desorption isotherms. The obtained nanocomposites are promising pigments for ceramic glazes, similar to the Purple of Cassius. The textural properties of certain samples, <b>S<sub>BET</sub></b> = 200–350 m<sup>2</sup>/g, a mean pore diameter (<b>D<sub>AV</sub></b>) of approximately 10 nm and a specific pore volume (<b>V<sub>t</sub></b>) between 0.5 and 0.8 cm<sup>3</sup>/g, make them promising candidates for catalytic applications, comparable to aerogel-like materials.https://www.mdpi.com/2310-2861/11/6/454gold nanoparticlessilicasol–gelceramic pigmentsnanocomposites |
| spellingShingle | Nina Danchova Dimitar Shandurkov Roumen Tsekov Luben Mihaylov Tony Spassov Stoyan Gutzov Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties Gels gold nanoparticles silica sol–gel ceramic pigments nanocomposites |
| title | Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties |
| title_full | Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties |
| title_fullStr | Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties |
| title_full_unstemmed | Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties |
| title_short | Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties |
| title_sort | porous silica gels doped with gold nanoparticles preparation microstructure optical and textural properties |
| topic | gold nanoparticles silica sol–gel ceramic pigments nanocomposites |
| url | https://www.mdpi.com/2310-2861/11/6/454 |
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