Preparation of gold nanoparticle-loaded silica gels and their localized surface plasmon resonance sensing properties
| Autor: | Atsuo Yasumori, Takeshi Ogaki, Masaki Goma, Sayaka Yanagida |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Silica gel technology industry and agriculture Nanoparticle Sintering Nanotechnology General Chemistry Condensed Matter Physics Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound chemistry Chemical engineering Transmission electron microscopy Colloidal gold Materials Chemistry Ceramics and Composites Surface plasmon resonance Biosensor Refractive index |
| Zdroj: | Journal of Sol-Gel Science and Technology. 71:1-7 |
| ISSN: | 1573-4846 0928-0707 |
| Popis: | Localized surface plasmon resonance (LSPR) of gold nanoparticles (AuNPs) has been used for biosensing and chemical sensing applications because the LSPR peak wavelength depends on the dispersion state and local refractive index of the surrounding medium. In this study, AuNP-loaded silica gels were prepared as sensing chips with high transparency and solution holding capability. The silica gels were prepared at various sintering temperatures from 500 to 900 °C, and the AuNPs precipitated in the gels by using a subsequent thermal reduction process. At sintering temperatures of 700, 800, and 900 °C, transparent and crack-free AuNP-loaded silica gels were obtained. Transmission electron microscopy observation revealed the AuNP size to be approximately 20 nm, and they were highly dispersed in all the silica gel samples. However, the sintering temperature of the silica gels strongly affected the LSPR property of the AuNPs and the porous property of the silica gel. The samples sintered at higher temperature exhibited a lower LSPR sensing ability against the refractive index of immersing solvents. The low sensing ability was considered as a result of a decrease in the contact area between the AuNPs and immersing solvent caused by an increase in the silica gel density with sintering temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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