| Full text | |
| Author(s): |
Secco de Souza, Caio Guilherme
;
Souza, Joao Batista, Jr.
;
Beck, Watson, Jr.
;
Varanda, Laudemir Carlos
Total Authors: 4
|
| Document type: | Journal article |
| Source: | Journal of Nanomaterials; v. 2017, p. 9-pg., 2017-01-01. |
| Abstract | |
We report the synthesis of a new multifunctional nanomaterial based on silica-coated FePt/Fe3O4 - CdSe heteronanostructures, combining luminescent and magnetic properties in a promising bifunctional sensor for biomedical applications. Spherical Fe3O4-coated FePt (FePt/Fe3O4) superparamagnetic nanoparticles (10.8 +/- 1.5 nm) with high saturation magnetization and controlled size and shape were obtained using thermal decomposition coupled with seed-mediated growth method. Luminescent property was added to the nanomaterial by using the FePt/Fe3O4 magnetic core as seed and growing the CdSe quantum dots (2.7 +/- 0.6 nm) onto its surface in a heterodimer-like structure using the hot-injection approach. The FePt/Fe3O4 - CdSe luminomagnetic heteronanostructures were coated with silica shell using the reverse-micelle microemulsion route to avoid solvent-quenching effects. After silica coating, the water-dispersible heteronanostructures showed a diameter of 25.3 +/- 2 nm, high colloidal stability, magnetic saturation of around 11 emu g(-1), and photoluminescence in the blue-green region, as expected for potential bifunctional platform in biomedical applications. The saturation magnetization of heteronanostructures can be increased to 28 emu g(-1) by annealing at 550 degrees C due to the presence of the FePt phase. (AU) | |
| FAPESP's process: | 13/01284-2 - Theranostic nanoparticles based in superparamagnetic iron oxide for skin cancer therapy by magnetic hyperthermia |
| Grantee: | Laudemir Carlos Varanda |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 12/02093-3 - Synthesis of Co@Au (superparamagnetics) and CdSe@Zn (quantum dots) core@shell nanostructures for applications as antineoplasia agents |
| Grantee: | João Batista Souza Junior |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 07/07919-9 - Colloidal magnetic nanocrystals: synthesis of self-assembled and macromolecules-functionalised nanospheres, nanowires, and nanorods for advanced magnetic recording, biotechnological, and biomedical applications |
| Grantee: | Laudemir Carlos Varanda |
| Support Opportunities: | Research Grants - Young Investigators Grants |