Versatile hollow fluorescent metal-silica nanohybrids through a modified microemulsion synthesis route

Clemente, A. ; Moreno, N. ; Lobera, M.P. (Universidad de Zaragoza) ; Balas, F. (Universidad de Zaragoza) ; Santamaria, J. (Universidad de Zaragoza)

Resumen: Silica-metal nanohybrids are common materials for applications in biomedicine, catalysis or sensing. Also, hollow structures are of interest as they provide additional useful features. However, in these materials the control of the size and accessibility to the inner regions of the structure usually requires complex synthesis procedures. Here we report a simple colloidal procedure for synthesizing hollow silica-metal nanohybrids, driven by the diffusion of metal precursors through the porous silica shell and subsequent reduction in aqueous solutions. The formation of hollow nanoparticles is controlled by the colloidal conditions during synthesis, which affect the ripening of hollow nanoparticles in presence of organosilanes. The modification of the conditions during synthesis affected the growth of silica precursors in presence of fluorescein isothiocyanate (FITC). The limited access to water molecules during the hydrolysis of silica precursors is attributed to the hydrophobicity of organic fluorescent molecules linked to the condensing silica clusters at the initial stages of nanoparticle formation and to the limitation of water content in the microemulsion method used. Finally, the growth of metal nanoseeds at the core of hollow nanoparticles can be easily achieved though a simple method in aqueous environment. The pH and thermal conditions during the reduction process affect the formation of metal-silica nanohybrids and their structural features.

Idioma: Inglés

DOI: 10.1016/j.jcis.2017.11.055

Año: 2018

Publicado en: JOURNAL OF COLLOID AND INTERFACE SCIENCE 513 (2018), 497-504
ISSN: 0021-9797

Factor impacto JCR: 6.361 (2018)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 29 / 148 = 0.196 (2018) - Q1 - T1

Factor impacto SCIMAGO: 1.29 - Biomaterials (Q1) - Surfaces, Coatings and Films (Q1) - Electronic, Optical and Magnetic Materials (Q1) - Colloid and Surface Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/FSE
Financiación: info:eu-repo/grantAgreement/EC/FP7/263147/EU/Development of reference methods for hazard identification, risk assessment and LCA of engineered nanomaterials/NANOVALID
Financiación: info:eu-repo/grantAgreement/ES/MINECO/JCI-2012-13421
Financiación: info:eu-repo/grantAgreement/ES/MINECO/RYC-2011-07641

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)