Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in Water
Magneto-plasmonic nanoparticles constituted of gold and iron oxide were obtained in an aqueous environment by laser ablation of iron and gold targets in two successive steps. Gold nanoparticles are embedded in a mucilaginous matrix of iron oxide, which was identified as magnetite by both microscopic...
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| Format: | Article |
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MDPI AG
2020-01-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/1/132 |
| _version_ | 1818031486306091008 |
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| author | Maurizio Muniz-Miranda Francesco Muniz-Miranda Emilia Giorgetti |
| author_facet | Maurizio Muniz-Miranda Francesco Muniz-Miranda Emilia Giorgetti |
| author_sort | Maurizio Muniz-Miranda |
| collection | DOAJ |
| description | Magneto-plasmonic nanoparticles constituted of gold and iron oxide were obtained in an aqueous environment by laser ablation of iron and gold targets in two successive steps. Gold nanoparticles are embedded in a mucilaginous matrix of iron oxide, which was identified as magnetite by both microscopic and spectroscopic analyses. The plasmonic properties of the obtained colloids, as well as their adsorption capability, were tested by surface-enhanced Raman scattering (SERS) spectroscopy using 2,2′-bipyridine as a probe molecule. DFT calculations allowed for obtaining information on the adsorption of the ligand molecules that strongly interact with positively charged surface active sites of the gold nanoparticles, thus providing efficient SERS enhancement. The presence of iron oxide gives the bimetallic colloid new possibilities of adsorption in addition to those inherent to gold nanoparticles, especially regarding organic pollutants and heavy metals, allowing to remove them from the aqueous environment by applying a magnetic field. Moreover, these nanoparticles, thanks to their low toxicity, are potentially useful not only in the field of sensors, but also for biomedical applications. |
| first_indexed | 2024-12-10T05:52:14Z |
| format | Article |
| id | doaj.art-6afba419a7fd4c73a1c594dacfe7788d |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-10T05:52:14Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-6afba419a7fd4c73a1c594dacfe7788d2022-12-22T02:00:01ZengMDPI AGNanomaterials2079-49912020-01-0110113210.3390/nano10010132nano10010132Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in WaterMaurizio Muniz-Miranda0Francesco Muniz-Miranda1Emilia Giorgetti2Department of Chemistry “Ugo Schiff”, University of Florence, Via Lastruccia 3, 50019 Sesto Fiorentino, ItalyÉcole Nationale Supérieure de Chimie de Paris and PSL Research University, CNRS, Institute of Chemistry for Life and Health Sciences (i-CLeHS), FRE 2027, 11, rue Pierre et Marie Curie, F-75005 Paris, FranceInstitute of Complex Systems (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, ItalyMagneto-plasmonic nanoparticles constituted of gold and iron oxide were obtained in an aqueous environment by laser ablation of iron and gold targets in two successive steps. Gold nanoparticles are embedded in a mucilaginous matrix of iron oxide, which was identified as magnetite by both microscopic and spectroscopic analyses. The plasmonic properties of the obtained colloids, as well as their adsorption capability, were tested by surface-enhanced Raman scattering (SERS) spectroscopy using 2,2′-bipyridine as a probe molecule. DFT calculations allowed for obtaining information on the adsorption of the ligand molecules that strongly interact with positively charged surface active sites of the gold nanoparticles, thus providing efficient SERS enhancement. The presence of iron oxide gives the bimetallic colloid new possibilities of adsorption in addition to those inherent to gold nanoparticles, especially regarding organic pollutants and heavy metals, allowing to remove them from the aqueous environment by applying a magnetic field. Moreover, these nanoparticles, thanks to their low toxicity, are potentially useful not only in the field of sensors, but also for biomedical applications.https://www.mdpi.com/2079-4991/10/1/132laser ablationgoldmagnetitesers2,2′-bipyridine |
| spellingShingle | Maurizio Muniz-Miranda Francesco Muniz-Miranda Emilia Giorgetti Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in Water Nanomaterials laser ablation gold magnetite sers 2,2′-bipyridine |
| title | Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in Water |
| title_full | Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in Water |
| title_fullStr | Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in Water |
| title_full_unstemmed | Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in Water |
| title_short | Spectroscopic and Microscopic Analyses of Fe<sub>3</sub>O<sub>4</sub>/Au Nanoparticles Obtained by Laser Ablation in Water |
| title_sort | spectroscopic and microscopic analyses of fe sub 3 sub o sub 4 sub au nanoparticles obtained by laser ablation in water |
| topic | laser ablation gold magnetite sers 2,2′-bipyridine |
| url | https://www.mdpi.com/2079-4991/10/1/132 |
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