Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications
Multifunctional micro- and nanoparticles have potential uses in advanced detection methods, such as the combined separation and detection of biomolecules. Combining multiple tasks is possible but requires the specific tailoring of these particles during synthesis or further functionalization. Here,...
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MDPI AG
2020-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/11/2136 |
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| author | Erin E. Bedford Christophe Méthivier Claire-Marie Pradier Frank Gu Souhir Boujday |
| author_facet | Erin E. Bedford Christophe Méthivier Claire-Marie Pradier Frank Gu Souhir Boujday |
| author_sort | Erin E. Bedford |
| collection | DOAJ |
| description | Multifunctional micro- and nanoparticles have potential uses in advanced detection methods, such as the combined separation and detection of biomolecules. Combining multiple tasks is possible but requires the specific tailoring of these particles during synthesis or further functionalization. Here, we synthesized nanostructured gold shells on magnetic particle cores and demonstrated the use of them in surface-enhanced Raman scattering (SERS). To grow the gold shells, gold seeds were bound to silica-coated iron oxide aggregate particles. We explored different functional groups on the surface to achieve different interactions with gold seeds. Then, we used an aqueous cetyltrimethylammonium bromide (CTAB)-based strategy to grow the seeds into spikes. We investigated the influence of the surface chemistry on seed attachment and on further growth of spikes. We also explored different experimental conditions to achieve either spiky or bumpy plasmonic structures on the particles. We demonstrated that the particles showed SERS enhancement of a model Raman probe molecule, 2-mercaptopyrimidine, on the order of 10<sup>4</sup>. We also investigated the impact of gold shell morphology—spiky or bumpy—on SERS enhancements and on particle stability over time. We found that spiky shells lead to greater enhancements, however their high aspect ratio structures are less stable and morphological changes occur more quickly than observed with bumpy shells. |
| first_indexed | 2024-03-10T15:19:00Z |
| format | Article |
| id | doaj.art-a0c26b3687ca42798b64327ceaf140ef |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T15:19:00Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-a0c26b3687ca42798b64327ceaf140ef2023-11-20T18:41:47ZengMDPI AGNanomaterials2079-49912020-10-011011213610.3390/nano10112136Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS ApplicationsErin E. Bedford0Christophe Méthivier1Claire-Marie Pradier2Frank Gu3Souhir Boujday4Laboratoire de Réactivité de Surface (LRS), CNRS, UMR 7197, Sorbonne Université, 4 place Jussieu, F-75005 Paris, FranceLaboratoire de Réactivité de Surface (LRS), CNRS, UMR 7197, Sorbonne Université, 4 place Jussieu, F-75005 Paris, FranceLaboratoire de Réactivité de Surface (LRS), CNRS, UMR 7197, Sorbonne Université, 4 place Jussieu, F-75005 Paris, FranceDepartment of Chemical Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1, CanadaLaboratoire de Réactivité de Surface (LRS), CNRS, UMR 7197, Sorbonne Université, 4 place Jussieu, F-75005 Paris, FranceMultifunctional micro- and nanoparticles have potential uses in advanced detection methods, such as the combined separation and detection of biomolecules. Combining multiple tasks is possible but requires the specific tailoring of these particles during synthesis or further functionalization. Here, we synthesized nanostructured gold shells on magnetic particle cores and demonstrated the use of them in surface-enhanced Raman scattering (SERS). To grow the gold shells, gold seeds were bound to silica-coated iron oxide aggregate particles. We explored different functional groups on the surface to achieve different interactions with gold seeds. Then, we used an aqueous cetyltrimethylammonium bromide (CTAB)-based strategy to grow the seeds into spikes. We investigated the influence of the surface chemistry on seed attachment and on further growth of spikes. We also explored different experimental conditions to achieve either spiky or bumpy plasmonic structures on the particles. We demonstrated that the particles showed SERS enhancement of a model Raman probe molecule, 2-mercaptopyrimidine, on the order of 10<sup>4</sup>. We also investigated the impact of gold shell morphology—spiky or bumpy—on SERS enhancements and on particle stability over time. We found that spiky shells lead to greater enhancements, however their high aspect ratio structures are less stable and morphological changes occur more quickly than observed with bumpy shells.https://www.mdpi.com/2079-4991/10/11/2136plasmonic nanoparticlesmagnetic nanoparticlesnanostructuresSERSXPSsurface functionalization |
| spellingShingle | Erin E. Bedford Christophe Méthivier Claire-Marie Pradier Frank Gu Souhir Boujday Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications Nanomaterials plasmonic nanoparticles magnetic nanoparticles nanostructures SERS XPS surface functionalization |
| title | Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications |
| title_full | Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications |
| title_fullStr | Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications |
| title_full_unstemmed | Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications |
| title_short | Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications |
| title_sort | nanostructured and spiky gold shell growth on magnetic particles for sers applications |
| topic | plasmonic nanoparticles magnetic nanoparticles nanostructures SERS XPS surface functionalization |
| url | https://www.mdpi.com/2079-4991/10/11/2136 |
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