title: A one-step short-time synthesis of Ag@SiO2 core-shell nanoparticles.
abstract: A performance of shell-thickness precise control in silver-silica coating core-shell nanoparticles is presented. 60nm sized citrate-stabilized silver nanoparticles are directly silica coated using a modified Stöber process. Tetraethyl orthosilicate is used as a silica precursor and ammonium hydroxide as catalyst in an alcoholic solvent to promote the seeded silica growth. By simply varying the synthesis reaction time from 4 to 60min, the silica shell thickness is increased from 5.1nm to 76.4nm. This well-controlled synthesis is then transposed to 40, 80 and 100nm sized silver cores in order to show the independence of the silica shell growth on the nanoparticle core size. Optical properties, i.e. localized surface plasmon resonance, of the produced silver-silica core-shell are also investigated.
authors.affiliation: GRASP-Biophotonics, Département de Physique, B5a, Université de Liège, B-4000 Liège, Belgium. Electronic address: m.lismont@ulg.ac.be.
authors.forename: Marjorie
authors.initials: M
authors.lastname: Lismont
authors.affiliation: Nanomatériaux, Catalyse et Electrochimie, Département de Chimie Appliquée, Génie chimique, B6a, Université de Liège, B-4000 Liège, Belgium.
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Páez
authors.affiliation: GRASP-Biophotonics, Département de Physique, B5a, Université de Liège, B-4000 Liège, Belgium.
authors.forename: Laurent
authors.initials: L
authors.lastname: Dreesen
mesh_terms: D002384:Catalysis; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D012834:Silver; D012822:Silicon Dioxide
keywords: Kinetics growth; Localized surface plasmon resonance; Nanoparticles; One-step synthesis; Silver–silica core–shell