Gold nanoparticle deposition on silica nanohelices : a new controllable 3D substrate in aqueous suspension for optical sensing.
Langue
en
Article de revue
Ce document a été publié dans
Journal of Physical Chemistry C. 2012, vol. 116, n° 43, p. 23143-23152
American Chemical Society
Résumé en anglais
We describe new methods to prepare gold nanoparticle/silica nanohelix hybrid nanostructures which form a 3D network in the aqueous phase. Nanometric silica helices and tubules obtained by sol-gel polycondensation on organic ...Lire la suite >
We describe new methods to prepare gold nanoparticle/silica nanohelix hybrid nanostructures which form a 3D network in the aqueous phase. Nanometric silica helices and tubules obtained by sol-gel polycondensation on organic templates of self-assembled amphiphilic molecules were further functionalized with (3-aminopropyl)triethoxysilane (APTES) or (3-mercaptopropyl)triethoxysilane (MPTES). These helices interact strongly with gold nanoparticles (GNPs) of various diameters (1-15 nm). Small GNPs (1-2 nm) at the surface of silica nanohelices grew to about 5 nm when stored in the appropriate organic solvent, whereas this growth process was not observed in water, allowing the size of GNPs at the surface of silica to be controlled by a simple solvent exchange. Larger GNPs (more than 10 nm) at the surface of nano hybrid fibers were used to produce surface enhanced raman scattering (SERS) using benzenthiol as a probe. This provides a novel sustainable approach for designing nanohybrid systems with photonic applications such as ultrasensitive chemical and biological sensors using a simple aqueous suspension of a 3D network of nanohelices.< Réduire
Mots clés
Nanoparticles
Gold
Silica
Aqueous phase
Origine
Importé de halUnités de recherche