Study on Preparation of Ag - SiO2 Nanocomposite Material Enhancing Fluorescence for Rhodamine 6G

Hoang Chi Hieu, Bui Van Hong, Nguyen Thi Bao Yen

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Published May 1, 2026
DOI: https://doi.org/10.25073/2588-1124/vnumap.5085

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HIEU, Hoang Chi; VAN HONG, Bui; BAO YEN, Nguyen Thi. Study on Preparation of Ag - SiO2 Nanocomposite Material Enhancing Fluorescence for Rhodamine 6G. VNU Journal of Science: Mathematics - Physics, [S.l.], may 2026. ISSN 2588-1124. Available at: <https://js.vnu.edu.vn/MaP/article/view/5085>. Date accessed: 03 june 2026. doi: https://doi.org/10.25073/2588-1124/vnumap.5085.
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Abstract

Ag - SiO2 nanocomposite material was synthesized by the Stöber method and reduction process. SEM images showed that SiO2 in the form of a nanosphere, and an average particle size of 165 nm, and Ag nanoparticles possess an average particle size of 17 nm, distributed quite evenly on the surface of SiO2 nanospheres. The UV - Vis absorption spectrum of Ag - SiO2 material presents a broad band at 400 nm attributed to plasmon surface resonance of Ag nanoparticles. Mixing up solutions of Ag - SiO2 and R6G, a fluorescence band of Rhodamine 6G (R6G) at 570 nm increased 86 times compared with that of only R6G. The as-prepared Ag - SiO2 nanocomposite material also increased the fluorescence intensity of R6G with concentration varying from 0.1 to 100 ppm.

Keywords: Ag - SiO2, Rhodamine 6G, MEF, photoluminescence, fluorescence.

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