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APTES duality and nanopore seed regulation in homogeneous and nanoscale-controlled reduction of Ag shell on SiO2 microparticle for quantifiable single particle SERS

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dc.contributor.author Rice, Daragh
dc.contributor.author Mouras, Rabah
dc.contributor.author Gleeson, Matthew
dc.contributor.author Liu, Ning
dc.contributor.author Tofail, Syed A.M.
dc.contributor.author Soulimane, Tewfik
dc.contributor.author Silien, Christophe
dc.date.accessioned 2018-11-01T12:54:22Z
dc.date.available 2018-11-01T12:54:22Z
dc.date.issued 2018
dc.identifier.uri http://hdl.handle.net/10344/7273
dc.description peer-reviewed en_US
dc.description.abstract Noble-metal nanoparticles size and packing density are critical for sensitive surface-enhanced Raman scattering (SERS) and controlled preparation of such films required to achieve reproducibility. Provided that they are made reliable, Ag shell on SiO2 microscopic particles (Ag/SiO2) are promising candidates for lab-on-a-bead analytical measurements of low analyte concentration in liquid specimen. Here, we selected nanoporous silica microparticles as a substrate for reduction of AgNO3 with 3-aminopropyltriethoxysilane (APTES). In a single preparation step, homogeneous and continuous films of Ag nanoparticles are formed on SiO2 surfaces with equimolar concentration of APTES and silver nitrate in ethanol. It is discussed that amine and silane moieties in APTES contribute first to an efficient reduction on the silica and second to capping the Ag nanoparticles. The high density and homogeneity of nanoparticle nucleation is further regulated by the nanoporosity of the silica. The Ag/SiO2 microparticles were tested for SERS using self-assembled 4-aminothiophenol monolayers, and an enhancement factor of ca. 2 × 106 is measured. Importantly, the SERS relative standard deviation is 36% when a single microparticle is considered and drops to 11% when sets of 10 microparticles are considered. As prepared, the microparticles are highly suitable for state-of-the-art quantitative lab-on-a-bead interrogation of specimens. en_US
dc.language.iso eng en_US
dc.publisher American Chemical Society en_US
dc.relation 13CDA2221 en_US
dc.relation.ispartofseries ACS Omega;3, pp. 13028-13035
dc.relation.uri http://dx.doi.org/10.1021/acsomega.8b01247
dc.subject analytical chemistry en_US
dc.subject core-shell materials en_US
dc.subject microstructure en_US
dc.subject nanofabrication en_US
dc.title APTES duality and nanopore seed regulation in homogeneous and nanoscale-controlled reduction of Ag shell on SiO2 microparticle for quantifiable single particle SERS en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1021/acsomega.8b01247
dc.contributor.sponsor SFI en_US
dc.relation.projectid 13CDA2221 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2862816


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