Facile Strategy for the Synthesis of Gold@Silica Hybrid Nanoparticles with Controlled Porosity and Janus Morphology

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dc.contributor.authorSantana Vega, Marina
dc.contributor.authorGuerrero Martínez, Andrés
dc.contributor.authorCucinotta, Fabio
dc.date.accessioned2023-06-17T12:37:18Z
dc.date.available2023-06-17T12:37:18Z
dc.date.issued2019-03-03
dc.description.abstractHybrid materials prepared by encapsulation of plasmonic nanoparticles in porous silica systems are of increasing interest due to their high chemical stability and applications in optics, catalysis and biological sensing. Particularly promising is the possibility of obtaining gold@silica nanoparticles (Au@SiO2 NPs) with Janus morphology, as the induced anisotropy can be further exploited to achieve selectivity and directionality in physical interactions and chemical reactivity. However, current methods to realise such systems rely on the use of complex procedures based on binary solvent mixtures and varying concentrations of precursors and reaction conditions, with reproducibility limited to specific Au@SiO2 NP types. Here, we report a simple one-pot protocol leading to controlled crystallinity, pore order, monodispersity, and position of gold nanoparticles (AuNPs) within mesoporous silica by the simple addition of a small amount of sodium silicate. Using a fully water-based strategy and constant content of synthetic precursors, cetyl trimethylammonium bromide (CTAB) and tetraethyl orthosilicate (TEOS), we prepared a series of four silica systems: (A) without added silicate, (B) with added silicate, (C) with AuNPs and without added silicate, and (D) with AuNPs and with added silicate. The obtained samples were characterised by transmission electron microscopy (TEM), small angle X-ray scattering (SAXS), and UV-visible spectroscopy, and kinetic studies were carried out by monitoring the growth of the silica samples at different stages of the reaction: 1, 10, 15, 30 and 120 min. The analysis shows that the addition of sodium silicate in system B induces slower MCM-41 nanoparticle (MCM-41 NP) growth, with consequent higher crystallinity and better-defined hexagonal columnar porosity than those in system A. When the synthesis was carried out in the presence of CTAB-capped AuNPs, two different outcomes were obtained: without added silicate, isotropic mesoporous silica with AuNPs located at the centre and radial pore order (C), whereas the addition of silicate produced Janus-type Au@SiO2 NPs (D) in the form of MCM-41 and AuNPs positioned at the silica–water interface. Our method was nicely reproducible with gold nanospheres of different sizes (10, 30, and 68 nm diameter) and gold nanorods (55 × 19 nm), proving to be the simplest and most versatile method to date for the realisation of Janus-type systems based on MCM-41-coated plasmonic nanoparticles.
dc.description.departmentDepto. de Química Física
dc.description.facultyFac. de Ciencias Químicas
dc.description.refereedTRUE
dc.description.sponsorshipComunidad de Madrid
dc.description.sponsorshipUniversidad Complutense de Madrid
dc.description.sponsorshipRoyal Society
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/66762
dc.identifier.doi10.3390/nano9030348
dc.identifier.issn2079-4991
dc.identifier.officialurlhttps://doi.org/10.3390/nano9030348
dc.identifier.relatedurlhttps://www.mdpi.com/2079-4991/9/3/348
dc.identifier.urihttps://hdl.handle.net/20.500.14352/12639
dc.issue.number3
dc.journal.titleNanomaterials
dc.language.isoeng
dc.page.initial348
dc.publisherMDPI
dc.relation.projectIDNANOBIOCARGO-CM (P2018/NMT-4389)
dc.relation.projectIDPR75/18
dc.relation.projectIDIE160101
dc.rightsAtribución 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/es/
dc.subject.keywordmesoporous silica
dc.subject.keywordgold nanoparticles
dc.subject.keywordJanus nanoparticles
dc.subject.keywordsol–gel synthesis
dc.subject.keywordMCM-41
dc.subject.ucmQuímica física (Física)
dc.subject.ucmQuímica física (Química)
dc.subject.unesco2210 Química Física
dc.titleFacile Strategy for the Synthesis of Gold@Silica Hybrid Nanoparticles with Controlled Porosity and Janus Morphology
dc.typejournal article
dc.volume.number9
dspace.entity.typePublication
relation.isAuthorOfPublication22761001-a3ad-4b9e-b47f-bfd3ba5f8a57
relation.isAuthorOfPublication.latestForDiscovery22761001-a3ad-4b9e-b47f-bfd3ba5f8a57
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